CENTENNIAL HALL RENOVATIONS TRUMAN STATE UNIVERSITY Issued for Bid

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1 CENTENNIAL HALL RENOVATIONS TRUMAN STATE UNIVERSITY Issued for Bid SECTION MAINTENANCE OF UNIT MASONRY PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section SUMMARY A. This Section includes the following masonry restoration and cleaning: % cleaning all exterior limestone and concrete building surfaces % repointing of limestone mortar joints as shown on the drawings. 3. Remove all miscellaneous wood and metal fasteners on the masonry, patch or repoint 4. Patching of all damaged exterior limestone. 5. Replacement of cracked or damaged bricks. 6. Repair or replacement of flashings. 7. Steel lintel replacements. 8. Reconstruction of parapet walls and as shown on the Drawings. 9. Removal and tooth-in masonry wall at new and existing infill openings DEFINITION A. Repointing: The process of raking out (removing) mortar and replacing it with new mortar. B. Low-Pressure Saturation Spray: 60 psi; 1-1/2-2 gpm per spray head. C. Medium-Pressure Warm Water Wash: 800 to 1200 psi; 4-6 gpm at 180 deg. F QUALITY ASSURANCE A. Restoration Specialist: The repair and pointing shall be carried out by a firm having not less than five (5) years successful experience in the cleaning, repair, joint raking and pointing of masonry similar to the work described in this Section. 1. The Contractor shall submit all the following information demonstrating the masonry contractor's qualifications and experience for approval by the Architect and Owner. Contractors not submitting the required information or failing to meet the minimum requirements will be disqualified and will not be allowed to perform the work of this Section. a. Provide written description of a minimum of three projects completed within the past five years for which the masonry contractor has performed the masonry cleaning, pointing and repair. Projects must have been performed on properties 75 years old or older. Provide the name and address of the project, the name and telephone number of the Owner and Architect, dates work was performed, and a description of the materials and methods used to perform the work for each project. b. Submit a resume for each of the persons who will be supervising and performing the work of this Section demonstrating a minimum of 3 years experience working in their trades, list of three example projects describing the work the person has performed. Example projects can be the same or different than the example projects described for the said masonry contractor described above. Only individuals whose resumes have been submitted, reviewed and accepted will be allowed to perform the work of this Section. MAINTENANCE OF UNIT MASONRY Project No.:

2 c. The masonry contractor's qualifications submittals shall be completed by the masonry contractor and shall be signed by an authorized official of the firm and dated. C. Field-Constructed Mock-Ups: Prior to start of general masonry restoration, prepare the following sample panels on building where directed by Architect. Obtain Architect's acceptance of visual qualities before proceeding with the work. Retain acceptable panels in undisturbed condition, suitably marked, during construction as a standard for judging completed work. 1. Cleaning: Demonstrate materials and methods to be used for cleaning of masonry surface and condition of sample panels of approximately 25 sq. ft. a. Test adjacent non-masonry materials for possible reaction with cleaning materials. b. Allow waiting period of duration indicated, but not less than 7 calendar days, after completion of sample cleaning to permit study of sample panels for negative reactions. 2. Repointing: Prepare 2 separate sample areas of approximately 3' high by 6' wide for each type of repointing required, one for demonstrating methods and quality of workmanship expected in removal of mortar from joints and the other for demonstrating quality of materials and workmanship expected in pointing mortar joints. 3. Stone Patching: Prepare one sample as selected from damaged stone of the building by the Owner's Representative for demonstrating quality of patching and workmanship expected in patching of the stone. This sample can be incorporated to the project. D. Source of Materials: Obtain materials for masonry restoration from a single source for each type material required to ensure match of quality, color, pattern, and texture. E. Architect may randomly select areas of tuckpointing to be raked for verification of the appropriate depth of pointing and void filling. Contractor shall bear the cost of repointing these areas of selected destructive testing in their base bid SUBMITTALS A. Product Data: Submit manufacturers' technical data for each product indicated including recommendations for their application and use. Include test reports and certifications substantiating that products comply with requirements. B. Restoration Program: Submit written program for each phase of restoration process including protection of surrounding materials on building and site during operations. Describe in detail materials, methods and equipment to be used for each phase of restoration work. C. Patching Mortar: Submit the following items in time to prevent delay of the work and to allow adequate time for review and resubmittals, if needed; do not order materials or start work before receiving the written approval: 1. Written certificates from the repair mortar Manufacturer shall be submitted stating that all installers of the repair mortar have successfully completed the training workshop for installation of the mortar. 2. Samples of all specified materials and Material Safety Data Sheets (MSDS) as appropriate. 3. Certificates, except where the material is labeled with such certification, by the producers of the materials,that all materials supplied comply with all the requirements of these specifications and the appropriate standards. 4. Color-match patch samples fabricated on pieces of appropriate masonry from or on the building using the specified repair mortar as required. MAINTENANCE OF UNIT MASONRY Project No.:

3 5. Written verification that all specified items will be used. Provide purchase orders, shipping tickets, receipts, etc. to prove that the specified materials were ordered and received DELIVERY, STORAGE, AND HANDLING A. Deliver materials to site in manufacturer's original and unopened containers and packaging, bearing labels as to type and names of products and manufacturers. B. Protect masonry restoration materials during storage and construction from wetting by rain, snow or ground water, and from staining or intermixture with earth or other types of materials. C. Protect mortar and other materials from deterioration by moisture and temperature. Store in a dry location or in waterproof containers. Keep containers tightly closed and away from open flames. Protect liquid components from freezing. Comply with manufacturer's recommendations for minimum and maximum temperature requirements for storage PROJECT CONDITIONS A. Clean masonry surfaces only when air temperatures are 40 deg.f (4 deg.c) and above and will remain so until masonry has dried out, but for not less than 7 days after completion of cleaning. B. Do not repoint mortar joints or repair masonry unless air temperatures are between 40 deg.f (4 deg.c) and 80 deg.f (27 deg.c) and will remain so for at least 48 hours after completion of work. C. Prevent mortar used in repointing and repair work from staining face of surrounding masonry and other surfaces. Remove immediately mortar in contact with exposed masonry and other surfaces. D. Protect sills, ledges and projections from mortar droppings SEQUENCING/SCHEDULING A. Perform masonry restoration work in the following sequence: 1. Clean existing masonry surfaces. 2. Repair existing masonry including replacing existing masonry with new masonry materials. 3. Repoint existing mortar joints as shown on the Drawings or as selected by Architect at time of construction. 4. Clean masonry surfaces after tuckpointing and repairs to remove mortar residues. PART 2 - PRODUCTS 2.01 MASONRY MATERIALS A. Provide brick to match existing bricks sizes, profiles, color, and surface textures. 1. Exterior: Use brick specified in B MORTAR MATERIALS A. Refer to Section Masonry Mortar for setting of masonry units. Historic Pointing Mortar to be used for final pointing of all affected joints. MAINTENANCE OF UNIT MASONRY Project No.:

4 2.03 MORTAR MIXES A. Measurement and Mixing: Measure cementitious and aggregate material in a dry condition by volume or equivalent weight. Do not measure by shovel, use known measure. Mix materials in a clean mechanical batch mixer. B. Do not use admixtures of any kind in mortar, unless otherwise indicated PRE-MIXED POINTING MORTAR A. Factory mixed Historic Pointing Mortar specially formulated for the restoration of limestone mortar joints. 1. Product: Subject to compliance with requirements. Send representative samples (one from each stone type) to pre-mixed mortar manufacturers to match existing mortar. Jahn M110 Historic Pointing Mortar or approved equal is to be used for this project. 2. Any additional mortar samples that may be required shall be taken from selected areas as directed by Architect and sent to pointing mortar manufacturer for custom color matching and mortar proportions. B. Surface Preparation: Joints to receive pointing mortar must be sound and free of all dust, dirt, grease, latience and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose and deteriorated mortar. The minimum depth of mortar application is 1". Rinse joints with clean water. C. Mixing: The mixing ratio is approximately 4 to 5 parts replication mix to 1 part water by volume, depending on temperature and humidity. Place clean water in a clean, rust free mixing container and add the powder. Mix manually until the mortar is thoroughly mixed. The mortar shall be the consistency of damp sand. D. Pointing: Moisten the joint using clean water. If the surface is allowed to dry out before applying pointing mortar, this step must be repeated. The mortar shall be applied using appropriate pointing tools. Place the mortar into the joint so that it matches the original joint profile. E. Curing: Periodically mist mortar joints using clean water for at least a 72 hour period. F. Clean Up: Remove uncured mortar from the substrate before it dries using clean water and a rubber sponge. Cured mortar may only be removed chemically or mechanically. G. Safety Requirements: It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection when mixing. H. Limitations: 1. Never apply pointing mortar to a frosted or exceedingly hot substrate. The applied mortar must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range shall be 40F to 90F with low to average humidity. 2. Never add bonding agents to pointing mortar or use them as surface preparation materials. 3. Minimum thickness of mortar application is 1". I. As directed by Architect, mortar sample shall be taken from selected areas and sent to pointing mortar manufacturer for custom color matching and mortar proportions. MAINTENANCE OF UNIT MASONRY Project No.:

5 2.05 CLEANING MATERIALS AND EQUIPMENT A. Water for Cleaning: Clean, potable, free of oils, acids, alkalis, salts, and organic matter. B. Brushes: Fiber bristle only. C. Technique One - Limestone Cleaner: Bio-Growth Cleaning : 1. Method A : This method of masonry cleaning process shall be used on all stone panels. a. Step One: Pre-wet surface. b. Step Two: Apply the following mix: One Part Bioklean Activator, by ProSoCo, Inc. One Part Enviro Klean Cleaner, by ProSoCo, Inc. Three Parts Water. c. Step Three: Allow about 15 to 30 minutes for mix to work on the soil (adjust the time as needed). d. Step Four: Rinse the area with hot water pressure washer with 3000 psi, 25 nozzle at 8 away from surface. e. Step Five: Neutralize with one part Limestone and Masonry Afterwash, by ProSoCo, Inc. and one part water. f. Step Six: Repeat Step Four. 2. Method B : a. Step One: Pre-wash surface. b. Step Two: Apply the following mix: 2 cups Tri Sodium Poly Phosphate (TSPP). 5 quarts bleach. 15 quarts hot water. c. Repeat steps three, four, five and six as described in Technique One - Method A. Note: Use bio-growth cleaning for all stone areas. In areas where bio-growth cleaning has not cleaned the stones, use Technique Two cleaning method for soil and weathering cleaning. Contractor shall assume 50% of stone surfaces may require use of Technique Two to clean soil and weathering. D. Technique Two - Limestone Cleaner - Soil and Weathering Cleaning: 1. Method A : This method shall be used on all soiled surfaces. a. Step One: Use hot water with 3000 psi, 25 nozzle, at 8 away from surface. b. Step Two: Use 766 Limestone and Masonry Prewash, by ProSoCo, Inc. c. Step Three: Rinse the area with hot water pressure washer with 3000 psi. d. Step Four: Neutralize with one part Limestone and Masonry Afterwash, by ProSoCo, Inc. And one part water. e. Step Five: Repeat Step Three. 2. Method B : a. Step One: Pre-wash surface. c. Step Two: Apply the following mix: 2 cups Tri Sodium Poly Phosphate (TSPP). 1/2 cup laundry detergent. 20 quarts hot water. c. Repeat steps three, four and five as described in Technique Two Method A. 3. All stone surfaces shall be 100% cleaned. E. Water-Rinsible Chemical Paint and Tar Remover: Manufacturers standard thixotropic water- MAINTENANCE OF UNIT MASONRY Project No.:

6 Rinsible solvent formulation for removing paint coatings from masonry. 1. Product: Subject to compliance with requirements, provide Sure Klean 509 Paint Stripper, ProSoCo, Inc. F. Spray Equipment: Provide equipment for controlled spray application of water and chemical cleaners, if any, at rates indicated for pressure, measured at spray tip, and for volume. 1. For spray application of chemical cleaners provide low-pressure tank or chemical pump suitable for chemical cleaner indicated, equipped with cone-shaped spray-tip. 2. For spray application of water provide fan-shaped spray-tip which disperses water at angle of not less than 45 degrees MISCELLANEOUS MATERIALS A. Stone-to-Stone Adhesive: High modulus, high strength, moisture-insensitive epoxy adhesive with a pot life of 30 minutes at 40 deg.f (4 deg. C). 1. Product: Subject to compliance with requirements, provide Sikadur 32 Hi-Mod Epoxy, Sika Corporation. B. Stone Anchors: Stainless steel rod (ASTM F593) with a diameter as indicated on contract drawings. If not indicated, to match existing in size. Cut ends of rods square. C. Bonding Agent: Water-based epoxy resin bonding agent. 1. Product: Subject to compliance with requirements, provide Sika Armalec 110, Sika Corporation. D. Crack Stitching: 304 to 316 Austenitic Stainless Steel. 1. Product: Subject to compliance with requirements, provide ¼ diameter, Heliabar Rods, Helibond Non-Shrink Cementitious Grout, Helifix North America Corporation 2.07 MASONRY PATCHING A. Repair mortar for patching masonry (M70, M90, M100, M120): Jahn Restoration Mortars are distributed by Cathedral Stone Products, Inc. Must be premixed cementitious injection grout formulated to match the color and texture of the existing stone that does not contain any acrylic, latex, or other synthetic polymer additives. The mortar need only be mixed with potable water at the site. The mortar must be vapor permeable, frost and salt resistant, shrink resistant, and be physically compatible with the substrate, including, but not limited to, porosity, tensile, and compressive strength. PART 3 - EXECUTION If proposed equal is submitted, thorough lab testing shall be required to establish equivalent performance levels. An independent testing laboratory shall be utilized as determined by the Specifier and paid for by the submitting party PREPARATION A. General: Comply with recommendations of manufacturers of chemical cleaners for protecting building surfaces against damage from exposure to their products. B. Protect persons, motor vehicles, surrounding surfaces of building whose masonry surfaces are being restored, building site, and surrounding buildings from injury resulting from masonry restoration work. 1. Prevent chemical cleaning solutions from coming into contact with pedestrians, motor vehicles, landscaping, buildings and other surfaces which could be injured by such contact. 2. Do not clean masonry during winds of sufficient force to spread cleaning solutions to unprotected surfaces. MAINTENANCE OF UNIT MASONRY Project No.:

7 3. Dispose of run-off from cleaning operations by legal means and in manner which prevents soil erosion, undermining of paving and foundations, damage to landscaping, and water penetration into building interiors. 4. Erect temporary protection covers over pedestrian walkways and at points of entrance and exit for persons and vehicles which must remain in operation during course of masonry restoration work. C. Protect glass, unpainted metal trim and polished stone from contact with acidic chemical cleaners by covering them with protective film. Apply protective film to comply with manufacturers recommendations. D. Protect unpainted metal from contact with alkali chemical cleaners by covering them with polyethylene protective film and waterproof masking tape. E. Containment of all run-off related to cleaning masonry will be a must in order to minimize impact on surrounding vegetation; contractor is responsible to meet all local, state and federal regulations in each masonry cleaner application, handling, and disposal. ProSoCo indicates that containment and proper disposal of Sure Klean 509 paint stripper is without exception always regulated due to the petroleum base products it contains CLEANING STONE WORK A. The Contractor shall provide access to the entire building exterior for cleaning operations. This may involve multiple types of staging, scaffolding, etc. for access to various areas. B. Proceed with cleaning in an orderly manner; work from top to bottom of each scaffold width and from one end of each elevation to the other. C. Use only those cleaning methods indicated for each material and location as approved by the Architect. 1. Use natural-fiber brushes only. 2. Use spray equipment that provides controlled application at volume and pressure indicated, measured at spray tip. Adjust pressure and volume to ensure that cleaning methods do not damage stonework. a. Equip units with pressure gages. 3. For water saturation spray application, use a fan-shaped spray tip that disperses water at an angle of 25 to 50 degrees. Position tips within 6" to 8" from soiled surfaces. Use degree nozzles for water washing. D. Perform each cleaning method indicated in a manner that results in uniform coverage of all surfaces, including corners, moldings, and interstices, and that produces an even effect without streaking or damaging masonry surfaces. E. Technique One - Limestone Cleaner: Bio-Growth Cleaning : 1. Method A : This method of masonry cleaning process shall be used on all stone panels with the potential for bio-growth on the surface. a. Step One: Pre-wet surface. b. Step Two: Apply the following mix: One Part Bioklean Activator, by ProSoCo, Inc. One Part Enviro Klean Cleaner, by ProSoCo, Inc. Three Parts Water. c. Step Three: Allow about 15 to 30 minutes for mix to work on the soil (adjust the time as needed). d. Step Four: Rinse the area with hot water pressure washer with 3000 psi, 25 nozzle at 8 away from surface. MAINTENANCE OF UNIT MASONRY Project No.:

8 e. Step Five: Neutralize with one part Limestone and Masonry Afterwash, by ProSoCo, Inc. and one part water. f. Step Six: Repeat Step Four. 2. Method B : d. Step One: Pre-wash surface. e. Step Two: Apply the following mix: 2 cups Tri Sodium Poly Phosphate (TSPP). 5 quarts bleach. 15 quarts hot water. c. Repeat steps three, four, five and six as described in Technique One - Method A. Note: Use bio-growth cleaning for all stone areas. In areas where bio-growth cleaning has not cleaned the stones, Use Technique Two cleaning method for soil and weathering cleaning. F. Technique Two - Limestone Cleaner for Soil and Weathering Cleaning: 1. Method A : This method shall be used on all soiled surfaces. a. Step One: Use hot water with 3000 psi, 25 nozzle, at 8 away from surface. b. Step Two: Use 766 Limestone and Masonry Prewash, by ProSoCo, Inc. c. Step Three: Rinse the area with hot water pressure washer with 3000 psi. d. Step Four: Neutralize with one part Limestone and Masonry Afterwash, by ProSoCo, Inc. And one part water. e. Step Five: Repeat Step Three. 2. Method B : a. Step One: Pre-wash surface. f. Step Two: Apply the following mix: 2 cups Tri Sodium Poly Phosphate (TSPP). 1/2 cup laundry detergent. 20 quarts hot water. c. Repeat steps 3, 4, & 5 as described in Technique Two Method A. 3. All stone surfaces shall be 100% cleaned G. Reapplication of Chemical Cleaners: Do not apply chemical cleaners to same masonry surfaces more than twice PAINT AND TAR REMOVAL A. Paint Removal with Water-Rinsible Chemical Paint Remover: Remove paint and tar from brick and limestone surfaces as follows: 1. Apply thick coating of water-rinsible chemical paint remover to painted masonry with natural fiber cleaning brush, deep-nap roller, or large paint brush. 2. Allow chemical paint remover to remain on surface for period recommended by paint remover manufacturer. Agitate periodically with a stiff bristle brush. 3. Remove chemical and paint residue by rinsing with water applied with medium pressure spray REPOINTING EXISTING MASONRY A. Joint Raking: 1. Rake out mortar from all joints to depths of not less than 1" nor less than that required to expose sound, unweathered mortar. 2. Remove mortar from masonry surfaces within raked-out joints to provide reveals with square backs and to expose masonry for contact with pointing mortar. Brush, vacuum or flush joints to remove dirt and loose debris. 3. Do not spall edges of masonry units or widen joints. Replace any stone which MAINTENANCE OF UNIT MASONRY Project No.:

9 become damaged. 4. Cut out old mortar head joint by electric caulk cutter knife. For all bed joints a small hand power saw with 1/8" thick, 3" to 4" diameter with diamond blades could be used if Contractor has demonstrated ability to work with this tool to Owner's Representative. 5. Do not cut mortar where stones come loose, displaced and may fall. Those areas shall be handled with care and one row at a time shall be cut. B. Joint Pointing: 1. Rinse masonry joint surfaces with water to remove any dust and mortar particles. Time application of rinsing so that, at time of pointing, excess water has evaporated or run off, and joint surfaces are damp but free of standing water. 2. Fill the voids with pointing mortar in layers. Compact each layer and allow it to become thumbprint hard before applying the next layer. Fill the voids to about 1" from exposed face of stones. Fill remaining 1" depth simultaneously with final pointing. 3. After joints have been filled to a uniform depth, place remaining pointing mortar in 3 layers with each of first and second layers filling approximately 3/8" and third layer the remaining 1/4". Fully compact each layer and allow to become thumbprint hard before applying next layer. Where existing stones have rounded edges recess final layer slightly from face. Take care not to spread mortar over edges onto exposed masonry surfaces, or to featheredge mortar. 4. When mortar is thumbprint hard, tool joints to match original appearance of joints, unless otherwise indicated. Remove excess mortar from edge of joint by brushing. 5. Cure mortar by maintaining in a damp condition for not less than 72 hours. Provide temporary protection in areas exposed to direct sun. 6. Where repointing work precedes cleaning of existing masonry, allow mortar to harden not less than 7 days before beginning cleaning work CRACK STITCHING A. Rake out the horizontal mortar beds to a minimum of 2 depth, for a minimum of 20 either side of the crack. B. Clean out the mortar bed with a blow pump and flush with water. C. Using a pointing gun, inject a bead of grout to the back of the slot. D. Push 1/4 (6 mm) austenitic stainless steel rod into the grout to obtain good coverage. E. Insert a further bead of grout over the exposed rod, finishing within 3/4 of the brick face, and iron into the slot using a trowel. F. Repoint the mortar bed with matching mortar. G. Fill the vertical crack with the specified sealant and rub matching masonry sand over fresh sealant to simulate mortar joints. H. Allow 4 to 6 bricks between vertical spacing of crack stitching, but not less than two (2) stitches per each crack STONE REPAIRS OF CRACKED STONES A. Carefully remove cracked stone to be repaired. Provide temporary shoring of the masonry at each location. Clearly mark on each piece the location and sequencing. B. Remove soil, loose stone particles, mortar, and other debris or foreign material from the surfaces to be bonded on both the fragment and the building stone from which fragment was removed by cleaning with stiff brush. MAINTENANCE OF UNIT MASONRY Project No.:

10 C. Apply adhesive to comply with adhesive manufacturer's directions. Coat bonding surface of building stone with stone-to-stone adhesive completely filling all voids and covering all surfaces. Fit stone fragments onto building stone while adhesive is still tacky and hold fragment securely in place until adhesive has cured. D. After adhesive has fully cured anchor stone fragments further with 1/4-inch-diameter threaded stainless steel rods set into " diameter holes drilled at a 45 deg. downward angle through the face of the stone. Center and space anchor rods between 3 and 5 inches apart and not less than 2 inches from any edge. Insert rods not less than 2 inches into backing stone and 2 inches into broken piece with end countersunk at least 3/4 inch from exposed face of stone. E. Clean residual adhesive from edges. Wet stone and fill chipped areas and holes with patching mortar as called out under Stone Patching. Avoid feather edging. Finish patched areas to match texture of and be level with adjoining surrounding stone surfaces. Keep patching mortar damp for 72 hours STONE PATCHING A. Workmanship: 1. Mortar workmanship should comply with all applicable recommendations of the material manufacturer's written specifications and requirements except as modified in this and the following section. 2. Do not use any additives, such as bonding agents, accelerators, or retarders, in the mortar without prior written approval from the Manufacturer. B. Preparation For Patching: 1. Patch spall areas with approved repair mortar according to the manufacturer's printed instructions, except as modified herein. 2. At areas to receive patches, remove all loose mortar and masonry. Cut away an additional " of the substrate to ensure the surface to be patched is solid and stable. "Sound" masonry with a hammer to verify its integrity. Remove any sealant residue. 3. Cut the edges of the repair area to provide a minimum depth of ". Do not overcut corners of patch; stop short of corner and chip out remainder by hand without damaging surrounding masonry. Do not allow any feathered edges in the patch area. 4. Roughen the substrate surface as necessary to achieve the surface roughness required by manufacturer for good bond, but do not damage the substrate surface. 5. Clean all dust from surface and pores of the substrate, using clean water and a scrub brush. Leave surface damp for optimum bond. 6. For very dry or porous surfaces, pre-wet the substrate ahead of time to prevent the substrate from drawing moisture out of the patch too quickly. Re-wet the surface just before applying the patching material. C. Mixing Mortar For Patching: 1. Do not mix more material than can be used within 30 minutes. Discard any material that has been mixed for 30 minutes or more. 2. Mixing Ratio for limestone is as follows: Pre-mixed patching mortar - Approximately 5 parts dry material to 1 part water. 3. Mix water and dry ingredients well. Adjust amount of water depending on the weather and the porosity of the substrate in accordance with the manufacturer's printed instructions. MAINTENANCE OF UNIT MASONRY Project No.:

11 D. Application of Patching Material: 1. Apply the Mortar Mix using a trowel in a series lifts with no waiting period or scratch coat necessary between layers, up to a total maximum thickness of 3". For patches thicker than 3", apply mortar in two layers, allowing the first layer to cure for a while before applying the second layer. If a cement skin forms, scrape approximately 1/16" of mortar off, dampen the first layer before applying second layer. Use light pressure during the applications. Work mortar firmly into the surface of the masonry, including the corners and under and around all mechanical anchors. 2. Build up patching material so that it is slightly above adjacent masonry surface. Allow 15 to 30 minutes to set slightly, (this will vary depending on the weather - much longer in cool weather) then scrape off excess material using a straight edge (a plasterer's miter rod is good for this). Do not press down or "float" the patch. Where patches occur at panel edges or corners, form mortar to match the profile of the surrounding masonry. In all cases, finish patch so that is as indistinguishable as possible from the adjacent masonry. 3. Clean any mortar residue from area surround the patch by sponging as many times as necessary with clean water. This should be done before patching material sets. 4. Lightly mist the patch with water to wet the entire surface of the finished patch approximately 30 minutes to 1 hour after completion on hot sunny days and approximately 2 hours on cool or cloudy days. time will vary with temperature and humidity. Mist at least once a day, but as often as possible on the two days following the patch installation. Install patch preferably on days when area will be available for misting during the next two consecutive days 3.08 STONE REMOVAL AND REPLACEMENT A. Carefully remove by hand at locations indicated. B. Remove mortar, loose particles and other debris from stone and stone surrounding. C. Replace removed stone with new stone matching existing, including size. Butter vertical joints for full width before setting and set units in full bed of mortar. 1. Repoint new mortar joints to comply with requirements for repointing existing masonry, except rake out joints before mortar sets. MAINTENANCE OF UNIT MASONRY Project No.:

12 3.09 BRICK REMOVAL AND REBUILDING A. Brick Removal: 1. Locations of brick removal will be marked by Architect and Owner s Representative and include the following: a. Damaged brick to be replaced as directed by Architect and Owner s Representative. b. Removal and rebuilding parapet walls. c. Removal and tooth-in around the new openings. 2. Carefully remove by hand at locations indicated any brick which are damaged, spalled or deteriorated. Cut out full units from joint to joint and in manner to permit replacement with full size units. Small hand power saw (3-4 diameter) with 1/8 thick diamond blade only could be used for bed joints. Cut out head joints by hand with chisel and mallet only. 3. Support and protect masonry indicated to remain which surround removal area. 4. Salvage as many whole, undamaged bricks as possible. 5. Remove mortar, loose particles and soil from salvaged brick by cleaning with brushes and water. Store brick for reuse. 6. Clean remaining brick at edges of removal areas by removing mortar, dust, and loose debris in preparation of rebuilding. 7. Repair any damaged flashing to make watertight. END OF SECTION MAINTENANCE OF UNIT MASONRY Project No.:

13 CENTENNIAL HALL RENOVATIONS TRUMAN STATE UNIVERSITY Issued for Bid SECTION UNIT MASONRY PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Concrete masonry units. 2. Pre-faced concrete masonry units. 3. Face brick. 4. Mortar and grout. 5. Steel reinforcing bars. 6. Masonry joint reinforcement. 7. Ties and anchors. 8. Miscellaneous masonry accessories. 9. Masonry-cell insulation. 1.3 DEFINITIONS A. CMU(s): Concrete masonry unit(s). B. Reinforced Masonry: Masonry containing reinforcing steel in grouted cells. 1.4 PERFORMANCE REQUIREMENTS A. Provide structural unit masonry that develops indicated net-area compressive strengths at 28 days. 1. Determine net-area compressive strength of masonry from average net-area compressive strengths of masonry units and mortar types (unit-strength method) according to Tables 1 and 2 in ACI 530.1/ASCE 6/TMS Determine net-area compressive strength of masonry by testing masonry prisms according to ASTM C PRECONSTRUCTION TESTING A. Preconstruction Testing Service: Contractor shall engage a qualified independent testing agency to perform preconstruction testing indicated below. Retesting of materials that fail to comply with specified requirements shall be done at Contractor's expense. UNIT MASONRY Project No.:

14 1. Concrete Masonry Unit Test: For each type of unit required, according to ASTM C 140 for compressive strength. 2. Mortar Test (Property Specification): For each mix required, according to ASTM C 109 for compressive strength, ASTM C 1506 for water retention, and ASTM C 91 for air content. 3. Mortar Test (Property Specification): For each mix required, according to ASTM C 780 for compressive strength. 4. Grout Test (Compressive Strength): For each mix required, according to ASTM C Prism Test: For each type of construction required, according to ASTM C ACTION SUBMITTALS A. Product Data: For each type of product indicated. B. Shop Drawings or manufacturer s data: For the following: 1. Masonry Units: Show sizes, profiles, coursing, and locations of special shapes. 2. Reinforcing Steel: Detail bending and placement of unit masonry reinforcing bars. Comply with ACI 315, "Details and Detailing of Concrete Reinforcement." Show elevations of reinforced walls. 3. Fabricated Flashing: Detail corner units, end-dam units, and other special applications. C. Samples for Initial Selection: 1. Pre-faced CMUs. 2. Face brick, in the form of straps of five or more bricks. 3. Weep holes/vents. D. Samples for Verification: For each type and color of the following: 1. Pre-faced CMUs. 2. Face brick, in the form of straps of five or more bricks. 3. Special brick shapes. 4. Accessories embedded in masonry. 5. Mortar materials. a. Portland Cement: 20 lbs. b. Hydrated Lime: 5 lbs. c. Sand: 10lbs. d. Deliver mortar material samples to the approved independent Testing Laboratory to be used in preparation of laboratory mortar cubes. 1.7 INFORMATIONAL SUBMITTALS A. List of Materials Used in Constructing Mockups: List generic product names together with manufacturers, manufacturers' product names, model numbers, lot numbers, batch numbers, source of supply, and other information as required to identify materials used. Include mix proportions for mortar and grout and source of aggregates. 1. Submittal is for information only. Neither receipt of list nor approval of mockup constitutes approval of deviations from the Contract Documents unless such deviations are specifically brought to the attention of Architect and approved in writing. B. Qualification Data: For testing agency. UNIT MASONRY Project No.:

15 C. Material Certificates: For each type and size of the following: 1. Masonry units. a. Include data on material properties and material test reports substantiating compliance with requirements. b. For brick, include size-variation data verifying that actual range of sizes falls within specified tolerances. c. For exposed brick, include test report for efflorescence according to ASTM C 67. d. For masonry units used in structural masonry, include data and calculations establishing average net-area compressive strength of units. 2. Cementitious materials. Include brand, type, and name of manufacturer. 3. Preblended, dry mortar mixes. Include description of type and proportions of ingredients. 4. Grout mixes. Include description of type and proportions of ingredients. 5. Reinforcing bars. 6. Joint reinforcement. 7. Anchors, ties, and metal accessories. D. Mix Designs: For each type of mortar[ and grout]. Include description of type and proportions of ingredients. 1. Include test reports for mortar mixes required to comply with property specification. Test according to ASTM C 109 for compressive strength, ASTM C 1506 for water retention, and ASTM C 91 for air content. 2. Include test reports, according to ASTM C 1019, for grout mixes required to comply with compressive strength requirement. E. Statement of Compressive Strength of Masonry: For each combination of masonry unit type and mortar type, provide statement of average net-area compressive strength of masonry units, mortar type, and resulting net-area compressive strength of masonry determined according to Tables 1 and 2 in ACI 530.1/ASCE 6/TMS 602. F. Cold-Weather and Hot-Weather Procedures: Detailed description of methods, materials, and equipment to be used to comply with requirements. G. Chemical analysis of Portland cement including, but not limited to, free alkali content. 1.8 QUALITY ASSURANCE A. Testing Agency Qualifications: Qualified according to ASTM C 1093 for testing indicated. B. Source Limitations for Masonry Units: Obtain exposed masonry units of a uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, from single source from single manufacturer for each product required. C. Source Limitations for Mortar Materials: Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from single manufacturer for each cementitious component and from single source or producer for each aggregate. D. Masonry Standard: Comply with ACI 530.1/ASCE 6/TMS 602 unless modified by requirements in the Contract Documents. UNIT MASONRY Project No.:

16 E. Sample Panels: Build sample panels to verify selections made under sample submittals and to demonstrate aesthetic effects. Comply with requirements in Section "Quality Requirements" for mockups. 1. Build sample panels for each type of face brick used in exterior wall locations in sizes approximately 60 inches long by 48 inches (1200 mm) high, full thickness. 2. Where masonry is to match existing, erect panels adjacent and parallel to existing surface. 3. Clean exposed faces of panels with masonry cleaner indicated. 4. Protect approved sample panels from the elements with weather-resistant membrane. 5. Approval of sample panels is for color, texture, and blending of masonry units; relationship of mortar and sealant colors to masonry unit colors; tooling of joints; aesthetic qualities of workmanship; and other material and construction qualities specifically approved by Architect in writing. a. Approval of sample panels does not constitute approval of deviations from the Contract Documents contained in sample panels unless such deviations are specifically approved by Architect in writing. 6. No masonry work shall be done until the Architect has approved the sample panel of the work involved. The approved panel shall remain undisturbed until completion and acceptance of unit masonry work at which time it shall be demolished and removed from the site. F. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Section "Project Management and Coordination." 1.9 DELIVERY, STORAGE, AND HANDLING A. Store masonry units on elevated platforms in a dry location. If units are not stored in an enclosed location, cover tops and sides of stacks with waterproof sheeting, securely tied. If units become wet, do not install until they are dry. B. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not use cementitious materials that have become damp. C. Store aggregates where grading and other required characteristics can be maintained and contamination avoided. D. Deliver preblended, dry mortar mix in moisture-resistant containers designed for use with dispensing silos. Store preblended, dry mortar mix in delivery containers on elevated platforms, under cover, and in a dry location or in covered weatherproof dispensing silos. E. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil PROJECT CONDITIONS A. Protection of Masonry: During construction, cover tops of walls, projections, and sills with waterproof sheeting at end of each day's work. Cover partially completed masonry when construction is not in progress. 1. Extend cover a minimum of 24 inches (600 mm) down both sides of walls and hold cover securely in place. UNIT MASONRY Project No.:

17 2. Where one wythe of multiwythe masonry walls is completed in advance of other wythes, secure cover a minimum of 24 inches (600 mm) down face next to unconstructed wythe and hold cover in place. B. Do not apply uniform floor or roof loads for at least 12 hours and concentrated loads for at least three days after building masonry walls or columns. C. Stain Prevention: Prevent grout, mortar, and soil from staining the face of masonry to be left exposed or painted. Immediately remove grout, mortar, and soil that come in contact with such masonry. 1. Protect base of walls from rain-splashed mud and from mortar splatter by spreading coverings on ground and over wall surface. 2. Protect sills, ledges, and projections from mortar droppings. 3. Protect surfaces of window and door frames, as well as similar products with painted and integral finishes, from mortar droppings. 4. Turn scaffold boards near the wall on edge at the end of each day to prevent rain from splashing mortar and dirt onto completed masonry. D. Cold-Weather Requirements: Do not use frozen materials or materials mixed or coated with ice or frost. Do not build on frozen substrates. Remove and replace unit masonry damaged by frost or by freezing conditions. Comply with cold-weather construction requirements contained in ACI 530.1/ASCE 6/TMS Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40 deg F (4 deg C) and higher and will remain so until masonry has dried, but not less than seven days after completing cleaning. 2. If ice or snow has formed on masonry bed, remove by carefully applying heat until the surface is dry to the touch. 3. When brick suction exceeds recommendations of Section Masonry Mortar, sprinkle with heated water. a. When units are above 32 degrees F, heat water above 70 degrees F. b. When units are below 32 degrees F, heat water above 130 degrees F. 4. Construction requirements while work is progressing: a. Air Temperature 40 degrees F to 32 degrees F: 1) Heat sand or mixing water to produce mortar temperatures between 40 degrees F and 120 degrees F. b. Air Temperature 32 degrees F to 25 degrees F: 1) Heat sand and mixing water to produce mortar temperatures between 40 degrees F and 120 degrees F. 2) Maintain temperatures of mortar on boards above freezing. c. Air Temperatures 25 degrees F to 20 degrees F: 1) Heat sand and mixing water to produce mortar temperatures between 40 degrees F and 120 degrees F. 2) Maintain mortar temperatures on boards above freezing. 3) Use salamanders or other heat sources on both sides of walls under construction. 4) Use windbreaks when wind is in excess of 15 mph. d. Air Temperature 20 degrees F and below: 1) Heat sand and mixing water to produce mortar temperatures between 40 degrees F and 120 degrees F. 2) Provide enclosures and auxiliary heat to maintain air temperatures above 32 degrees F. 3) Minimum temperature of units when laid: 20 degrees F. UNIT MASONRY Project No.:

18 e. Protection requirements for completed masonry and masonry not being worked on: 1) Mean daily air temperature 40 degrees F to 32 degrees F: Protect masonry from rain or snow for 24 hours by covering with weather-resistive membrane. 2) Mean daily air temperature 32 degrees F to 25 degrees F: Completely cover masonry with weather-resistive membrane for 24 hours. 3) Mean daily air temperature 25 degrees F to 20 degrees F: Completely cover masonry with insulating blankets or equal protection for 24 hours. 4) Mean daily air temperature 20 degrees and below: Maintain masonry temperature above 32 degrees F for 24 hours by use of enclosure and supplementary heat. E. Hot-Weather Requirements: Comply with hot-weather construction requirements contained in ACI 530.1/ASCE 6/TMS 602. PART 2 - PRODUCTS 2.1 MASONRY UNITS, GENERAL A. Defective Units: Referenced masonry unit standards may allow a certain percentage of units to contain chips, cracks, or other defects exceeding limits stated in the standard. Do not use units where such defects will be exposed in the completed Work. B. Fire-Resistance Ratings: Where indicated, provide units that comply with requirements for fireresistance ratings indicated as determined by testing according to ASTM E 119, by equivalent masonry thickness, or by other means, as acceptable to authorities having jurisdiction. 2.2 CONCRETE MASONRY UNITS A. Shapes: Provide shapes indicated and as follows, with exposed surfaces matching exposed faces of adjacent units unless otherwise indicated. 1. Provide special shapes for lintels, corners, jambs, sashes, movement joints, headers, bonding, and other special conditions. 2. Provide bullnose units for outside corners unless otherwise indicated. a. Bullnose units to extend to line of ceiling height indicated per Architectural Reflected Ceiling Plans. Square-edge units to be used for outside corners from line of ceiling and higher to provide tight corner for abutting ceiling trims. B. Integral Water Repellent: Provide units made with integral water repellent for exposed units. 1. Integral Water Repellent: Liquid polymeric, integral water-repellent admixture that does not reduce flexural bond strength. Units made with integral water repellent, when tested according to ASTM E 514 as a wall assembly made with mortar containing integral waterrepellent manufacturer's mortar additive, with test period extended to 24 hours, shall show no visible water or leaks on the back of test specimen. UNIT MASONRY Project No.:

19 a. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following: C. CMUs: ASTM C 90. 1) ACM Chemistries; RainBloc. 2) BASF Aktiengesellschaft; Rheopel Plus. 3) Grace Construction Products, W. R. Grace & Co. - Conn.; Dry-Block. 1. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 2150 psi (14.8 MPa). 2. Density Classification: a. Lightweight for interior use. b. Normal weight for exterior use. 3. Size (Width): Manufactured to dimensions 3/8 inch less than nominal dimensions. 4. Exposed Faces: Provide color and texture matching the range represented by Architect's sample. 5. Faces to Receive Plaster: Where units are indicated to receive a direct application of plaster, provide textured-face units made with gap-graded aggregates. D. Pre-faced CMUs: Lightweight hollow concrete units complying with ASTM C 90, with manufacturer's standard smooth resinous facing complying with ASTM C Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following: a. Trenwyth; Astra Glaze Premier Block. 2. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 2150 psi (14.8 MPa). 3. Size: Manufactured to dimensions specified in "CMUs" Paragraph but with pre-faced surfaces having 1/16-inch- (1.5-mm-) wide returns of facing to create 1/4-inch- (6.5-mm-) wide mortar joints with modular coursing. a. Match existing dimensions. 4. Colors and Patterns: Match existing. 2.3 CONCRETE AND MASONRY LINTELS A. General: Provide one of the following: B. Concrete Lintels: ASTM C 1623, matching CMUs in color, texture, and density classification; and with reinforcing bars indicated by manufacturer unless specifically noted otherwise in the plans. Provide lintels with net-area compressive strength not less than CMUs. C. Masonry Lintels: Prefabricated or built-in-place masonry lintels made from bond beam CMUs with reinforcing bars placed as indicated and filled with coarse grout. Cure precast lintels before handling and installing. Temporarily support built-in-place lintels until cured. UNIT MASONRY Project No.:

20 2.4 BRICK A. General: Provide shapes indicated and as follows, with exposed surfaces matching finish and color of exposed faces of adjacent units: 1. For ends of sills and caps and for similar applications that would otherwise expose unfinished brick surfaces, provide units without cores or frogs and with exposed surfaces finished. 2. Provide special shapes for applications where stretcher units cannot accommodate special conditions, including those at corners, movement joints, bond beams, sashes, and lintels. 3. Provide special shapes for applications requiring brick of size, form, color, and texture on exposed surfaces that cannot be produced by sawing. 4. Provide special shapes for applications where shapes produced by sawing would result in sawed surfaces being exposed to view. B. Face Brick: Facing brick complying with ASTM C Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following: a. Glen-Gery Brick. b. Belden Brick Company. 2. Grade: SW. 3. Type: FBS. 4. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 3350 psi (23.10 MPa). 5. Initial Rate of Absorption: Less than 30 g/30 sq. in. (30 g/194 sq. cm) per minute when tested per ASTM C Efflorescence: Provide brick that has been tested according to ASTM C 67 and is rated "not effloresced." 7. Surface Coating: Brick with colors or textures produced by application of coatings shall withstand 50 cycles of freezing and thawing per ASTM C 67 with no observable difference in the applied finish when viewed from 10 feet (3 m). 8. Size (Actual Dimensions): 3-5/8 inches (92 mm) wide by 2-1/4 inches (57 mm) high by 7-5/8 inches (194 mm) long. 9. Application: Use where brick is exposed unless otherwise indicated. 10. Provide custom face brick matching color range, texture, and size of existing adjacent brickwork. 2.5 MORTAR AND GROUT MATERIALS A. General: Bags shall be stamped to show that cement and lime conform to the referenced specifications, or mill test certificates shall be supplied verifying such conformity. B. Portland Cement: ASTM C 150, Type I or II, except Type III may be used for cold-weather construction. Provide natural color or white cement as required to produce mortar color indicated. C. Hydrated Lime: ASTM C 207, Type S. UNIT MASONRY Project No.: