1. Removal of existing deteriorated brick units 2. Installation of new brick units 3. Repointing to repair deteriorated or missing mortar

Transcription

1 SECTION REPLACEMENT AND/OR INSTALLATION OF BRICK MASONRY AND/OR REPOINTING PART I GENERAL 1.1 SUMMARY A. Furnish all labor, materials and accessories, equipment and services necessary for the removal of deteriorated masonry units, the installation of new replacement masonry units and/or repointing of existing deteriorated mortar joints, where shown on Drawings or as instructed, as specified herein, and/or as needed for a complete and proper installation to highest industry standards. Drawings and general provisions of the Contract, including Division 1, General and Supplementary Conditions apply to this Section. B. Work includes but is not limited to: 1.2 REFERENCES 1. Removal of existing deteriorated brick units 2. Installation of new brick units 3. Repointing to repair deteriorated or missing mortar A. Brick Institute of America Technical Notes B. Technical Preservation Services: Preservation Briefs 1.3 RELATED WORK A. Section Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing B. Section Sealants 1.4 PREINSTALLATION MEETINGS A. Preinstallation Conference: Conduct conference at project site. 1.5 SUBMITTALS A. Submit manufacturer's product data for each type of masonry unit, masonry accessory, and other manufactured products. Include certifications and test reports from a testing laboratory that is independent of the manufacturer, indicating that each type of masonry and masonry accessory comply with the specified requirements. Product data shall be furnished for approval by the Architect prior to use. B. Samples for initial selection: 1. Clay face brick, two or more bricks Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

2 C. Material Certificates: For each type and size of the following: 1. Masonry units. a. Include data on material properties, 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 Preblended, dry mortar mixes. Include description of type and proportions of ingredients. D. Cold-Weather and Hot-Weather Procedures: Detailed description of methods, materials, and equipment to be used to comply with requirements. 1.6 QUALITY ASSURANCE A. Use adequate numbers of skilled workmen who are thoroughly trained and experienced in the necessary crafts and who are completely familiar with the specified requirements and the methods needed for proper performance of the work of this Section. For repointing, use only qualified and experienced repointing craftsmen with a minimum of ten (10) years experience with repointing of structures. B. Do not repoint until all sources of moisture penetration has been remediated. C. Do not install masonry or repoint if the wall temperature is less than forty degrees or the temperature is expected to drop below forty degrees within a twenty-four hour time period or is above 90 degrees. D. In addition to complying with all pertinent codes and regulations comply with Technical Notes on Brick Construction published by Brick Institute of America, most current edition and the Preservation Briefs published by Technical Preservation Services, National Park Service, U.S. Department of the Interior. E. Construct mock-ups to verify selections made under this and other specification sections to demonstrate aesthetic effects and to set quality standards for materials and execution. 1. Clean exposed face of existing masonry prior to construction mockup. 2. Construct field mock-up within existing façade: Install one sample area, 2 x2 of repointing and replacement brick. 3. Clean exposed faces of mock-up with masonry cleaner as indicated. 4. Mock-up shall be allowed to cure seven (7) days before inspection and approval by Owner and Architect. 1.7 DELIVERY AND STORAGE 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. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

3 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. Store preblended, dry mortar mix in delivery containers on elevated platforms in a dry location or in covered weatherproof dispensing silos. E. Store masonry accessories, to prevent corrosion and accumulation of dirt and oil. 1.8 FIELD CONDITIONS A. Protection of Masonry: During construction, cover partially completed masonry with waterproof sheeting at end of each day's work or when construction is not in progress. B. Stain Prevention: Prevent mortar, from staining the face of masonry. Immediately remove, mortar that comes in contact with masonry. 1. Protect sills, ledges, and projections from mortar droppings. 2. 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. C. 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 TMS 602/ACI 530.1/ASCE Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40 F and higher and will remain so until masonry has dried, but not less than seven (7) days after completing cleaning. D. Hot-Weather Requirements: Comply with hot-weather construction requirements contained in TMS 602/ACI 530.1/ASCE 6. PART 2 - PRODUCTS 2.1 BRICK A. Acceptable products: 1. All brick shall comply with the following: brick to match size, color range, blend, face, and texture of existing structure exactly. Brick shall be clean and in sound condition. Obtain approval of Architect and Owner prior to proceeding. 2. Provide independent laboratory tests that any and all submitted face brick complies with ASTM C 216 with an SW FBS rating and ASTM C67 for no efflorescence rating and an IRA of less than 30 g/30 sq. in per minute when tested according to ASTM C 67. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

4 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. All mortar shall match existing color and texture exactly. 2.2 COPING STONES A. See Specification Section , Removal and Replacement of Existing Coping Stones/Repointing and Installation of Lead Stone Flashing. 2.3 MORTAR A. Portland cement: Comply with ASTM C 150, type I. B. Masonry cement: Comply with ASTM C 91. C. Lime: Provide hydrated lime, Type S complying with ASTM C207. D. Aggregate: Provide clean, well graded aggregate free from injurious amounts of dust, lumps, shale, alkali, surface coatings, and organic matter, and complying with ASTM C144. Note: Select sand for color to match existing mortar. E. Admixtures: Do not use admixtures unless specifically approved in advance by the Architect. F. Water: Provide water free from deleterious amounts of acids, alkalis, and organic materials. G. Color: Match existing original mortar color of structure, exactly. H. Joint type: Match existing rake exactly. I. Mixture: Match existing mortar exactly, color, texture, proportion and ensure compatibility with brick. Comply with Proportion Specifications in accordance with ASTM C 270, Type N, BIA Designation M1-72. (See Brick Institute of America, Technical Notes on Brick Construction. ) Release 8 Revision II, Released November 1989 and 8A Revised, Released September J. Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, waterrepellent agents, antifreeze compounds, or other admixtures unless otherwise indicated. 2.4 MISCELLANEOUS MASONRY ACCESSORIES (IF REQUIRED) A. Compressible Filler: Premolded filler strips complying with ASTM D 1056, Grade 2A1; compressible up to 35 percent; of width and thickness indicated; formulated from neoprene, urethane or PVC. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

5 2.5 MASONRY CLEANERS A. Acidic Cleaner: Manufacturer's standard-strength cleaner designed for removing mortar/grout stains, efflorescence, and other new/existing construction stains from new/existing masonry without discoloring or damaging masonry surfaces. Do not use muriatic acid. Use product expressly approved for intended use by cleaner manufacturer and manufacturer of masonry units being cleaned. PART 3 - EXECUTION 3.1 MORTAR A. Procedure for Mixing Mortar Note: The mixed mortar shall be of consistency to be molded into a ball by hand. A skilled brick layer should test mortar for feel releasing or increasing sand or water as needed. Mortar shall be easy working. 1. Match existing mortar throughout structure: Provide mortar and strength as required to match existing mortar at site exactly and/or use acid digestion test to determine components, color and texture of sand as directed by the Architect or Owner. 2. Proportions: As per Specifications of the Brick Institute of America, Technical Notes on Brick Construction, release 7F, 28, 8 A + B and 11E, revised January, 1987, July 1986, November 1989, September 1988, and June Repointing mortar should be prehydrated to reduce excessive shrinkage. Prehydrate as per Specifications of the Brick Institute of America, Technical Notes on BrickConstruction, release 7F, 28, 8 A + B, and 11E, revised January, 1987, July 1986, November 1989, September 1988, and June A sample or samples of mortar shall be mixed dry by hand mixing and compared with the existing mortar sample for color, texture and amount and size of sand, aggregate, or other materials. Install 6 x6 area within mock-up, allow to dry for 7 days before inspection\approval by owner\architect. 5. The mixed mortar shall be of a consistency to be molded into a ball by hand. 6. Mortar shall be mixed with maximum amount of water to produce workable consistency. 7. Mixed mortar shall be permitted to stand for not less than one -half hour, nor more than one and one-half hours for pre-hydration. 8. All mortar shall be used within one-half (½) hour of its initial mixing. Re-tempering of the mortar (adding of additional water to the mix) to replace evaporated water shall not be permitted. 9. Upon completion, clean surfaces of masonry as required for proper application of the specified finishes. 3.2 REPLACEMENT/INSTALLATION OF NEW BRICK MASONRY UNITS A. Examine the areas and conditions under which work of this Section will be performed. Correct conditions detrimental to timely and proper completion of the work. Do not proceed until unsatisfactory conditions are corrected. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

6 B. Comply with Section 2.1 and 2.2. C. Remove unit masonry as shown on the Drawings or as needed for a complete and proper installation. D. Removal: 1. The old mortar should be cut out. Care must be taken not to damage the adjacent brick edges. All dust and debris must be removed from the joint by brushing, blowing with air or rinsing with water prior to installation of new masonry units. Dispose of all material not to be reused. E. Installation: 1. Wetting of bricks: a. Pre-wet only if IRA is greater than thirty grams per minute per thirty square inch area. Wetting shall be performed no more than 24 or less than 12 hours prior to laying brick. b. Provide sufficient dampness so that mortar will remain plastic enough to permit the brick to be leveled and plumb immediately after being laid, without destroying the bond. 2. Laying: a. All work shall be in compliance with the Specifications of the Brick Institute of America, "Technical Notes on Brick Construction," most recent edition. b. Unless otherwise indicated on the Drawings, make the brickwork plumb, level, and true to line, with square angles and corners. Center brick in opening and press in place. Follow existing bond pattern. All new work shall not be discernible from existing. c. Use line blocks whenever possible. When it is absolutely necessary to use a line pin, fill the hole immediately after the pin is withdrawn. d. Use only bricks that are clean and free from dust and other foreign matter. e. Bed Joints: (1) Bevel all bed joints, sloping toward the center of the wall in such a manner that the bed joints will be completely filled when the brick is finally brought into line. (2) Do not furrow bed joints. (3) Lay all brick units within 1 minute of placing mortar (4) Avoid fins of bed joints protruding into cavity space. (a) If they occur, leave in place if not projecting more than the bed joint thickness. (b) Do not, in any case, cut off and drop into cavity space. (5) Lay masonry units within one minute of preparing bed joints. f. Head joints: (1) Fill completely to ensure full joint. (2) Butter end of brick prior to installation to ensure full joint. g. Do not move or shift bricks. If moved or shifted, review and lay again in fresh mortar. h. Immediately remove mortar from areas where they are not scheduled to be placed. 3.3 CLEANING EXISTING BRICK SURFACE A. Clean all existing brick surfaces throughout area where masonry work is to be performed comply with 3.7 A below. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

7 3.4 REPOINTING A. Installation 3.5 JOINERY 1. Clean existing walls; existing walls shall be cleaned to remove dirt, efflorescence and loose mortar using low pressure and natural bristle brushes. If needed, use non-ionic detergent in accordance with Manufacturer s Specifications. Pressure should be based on the density of the existing brick and mortar but in no case exceed 400 psi, initiate cleaning using 100 psi and increase pressure as required to remove efflorescence. Water stream shall be directed at the masonry at an angle of not more than 30 degrees from the wall surface. 2. Identify areas to be repointed as specified by Architect, Owner or Owner s Representative, and as shown on the Drawings. 3. Install sample area: See 1.6 this Section. 4. The old mortar should be cut out, by means of small power chisels/saws (either pneumatic or a thin diamond blade) to a uniform depth of 2 to 2 1/2 times the width of the joint or until sound mortar is reached. Care must be taken not to damage the brick edges to remain in place when cutting joints. All dust and debris must be removed from the joint by brushing, blowing with air or rinsing with water. 5. Joints to be repointed should be dampened. To ensure good bond, brick must absorb all surface water. No standing water should be present. 6. Pack mortar tightly in layer ¼ maximum. 7. Layers to be thumbprint hard before applying successive layer. 8. Tool to match the original profile after the last layer of mortar is thumb print hard. A. General: Cut out and repoint defective joints. 1. On all joints exposed to the weather, tool and make smooth, solid, and watertight. 2. Match existing joint profile (rake) and size, or as specified on the Drawings. 3.6 POINTING AND CLEANING A. Visually inspect the Work of this Section and point, or cut out and repoint, if necessary, all holes and defective joints not in conformance or as directed by Architect. B. Thoroughly clean all brick surfaces to be left exposed in the finished Work, removing all traces of mortar, and foreign matter. In the event ordinary cleaning is not adequate, provide additional cleaning as so directed by Architect, and at no additional cost to the Owner. C. Remove and replace masonry units that are loose, chipped, broken, stained, or otherwise damaged or that do not match adjoining units. Install new units to match adjoining units; install in fresh mortar, pointed to eliminate evidence of replacement. D. Pointing: During the tooling of joints, enlarge voids and holes, except weep holes, and completely fill with mortar. Point up joints, including corners, openings, and adjacent construction, to provide a neat, uniform appearance. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

8 F. In-progress cleaning: Clean unit masonry as work progresses by dry brushing to remove mortar fins and smears before tooling joints. Mortar fins will not be acceptable G. Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry as follows: 1. Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels. 2. Test cleaning methods on sample wall panel; leave one-half of panel uncleaned for comparison purposes. Obtain Architect's approval of sample cleaning before proceeding with cleaning of masonry. 3. Protect adjacent stone and non-masonry surfaces from contact with cleaner by covering them with liquid strippable masking agent or polyethylene film and waterproof masking tape. 4. Wet wall surfaces with water before applying cleaners; remove cleaners promptly by rinsing surfaces thoroughly with clear water. 5. Clean brick by bucket-and-brush hand-cleaning method described in BIA Technical Notes MASONRY WASTE DISPOSAL A. Salvageable Materials: Unless otherwise indicated, excess masonry materials are Owner s property. At completion of unit masonry work, move to location specified by Owner. B. Waste Disposal: Dispose of masonry waste, including excess or soil-contaminated sand, waste mortar, and broken masonry units off site in compliance with all jurisdictional codes and ordinances. 3.8 CURING CONDITION A. Do not allow new mortar to dry out too rapidly. B. Periodically rewet repointed areas after thumb print hard & finish tooled to accelerate carbonation process. C. Where feasible, mist with hand sprayer with fine mist nozzle for 1 to 2 days. Continue to rewet repointing as dictated by local conditions to ensure adhesion and durability of new mortar. D. Where feasible, cover walls with burlap for 3 days after repointing to ensure they are kept damp. END OF SECTION Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science & Technology, Rolla, MO Replacement and/or Installation of Brick Masonry &/or Repointing

9 SECTION REMOVAL AND REPLACEMENT OF EXISTING COPING STONE, REPOINTING AND INSTALLATION OF LEAD STONE FLASHING PART I GENERAL 1.1 SUMMARY A. Provide all materials, labor and accessories for the complete and proper installation of removal of existing broken coping stones as required to the highest industry standards. The work shall include the following: 1.2 RELATED SECTIONS 1. Removal and replacement of deteriorated/broken coping stones 2. Mock-ups 3. Installation of pointing 4. Installation of lead stone flashing A. Section Replacement and/or Installation of Brick Masonry and/or Repointing B. Section Joint Sealants 1.3 RELATED DOCUMENTS A. ASTM C-568, Standard Specification for Limestone Building Stone. B. ASTM C-97, Test Methods for Absorption, and Bulk Specific Gravity of Building Stones. C. ASTM C-99, Test Methods for Modulus of Rupture of Building Stones. D. ASTM -170, Test Method for Compressive Strength of Building Stone. E. Indiana Limestone Handbook, latest edition, Contractors Handbook on Indiana Limestone, latest edition. F. ILIA Technote on Safety Factors and other applicable ILIA Technotes. 1.4 SYSTEM DESCRIPTION A. General: Design, fabricate, and install stonework to withstand normal loads from wind, gravity, movement of building structure, and thermally induced movements, as well as to resist deterioration under conditions of normal use including exposure to weather, without failure. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

10 B. Performance Requirements General: The requirements shown on the general stone details are intended to establish basic dimensions of units or modules, plus profiles and sight lines for the stonework. Within these limitations, the Contractor shall be responsible for the design of the stonework, and shall request approval of, and make whatever modifications and additions to the details as may be required to fulfill the performance requirements. Architect s approval is required prior to ordering materials or initiating work. The visual concept shall be maintained as shown, including profiles and alignment of components. The Contractor shall be responsible for the design of the units, fasteners, support, retention, anchorage and lateral support system and shall request approval of, and make whatever modifications and additions to the details as many are required to fulfill the performance requirements. The system shall include all items required to connect the stone to the structure (or secondary framing). Drawings of all support and anchorage items shall be produced by the contractor in sufficient detail for fabrication and for the detailing and completion of the shop drawings as prepared by the stone fabricator. C. Engineering Calculations: If required, engineer shall be a registered in the State of Missouri Professional engineer and shall be experienced in cladding design to design the cladding support and retention system. 1.5 PERFORMANCE REQUIREMENTS COPING STONE A. Physical Properties: The Limestone physical properties shall meet or exceed the values listed in the Indiana Limestone Institute of America, Inc. Handbook (ILIA), latest edition. B. Safety Factors-Stone: Safety factors for Indiana Limestone shall be not less than as listed in the Technote on Safety Factors, as published by ILIA. C. Connections and attachments for coping stone: Support and Retention Steel: All steel shapes, plated and straps shall be designed to carry the design loads with safety factors and allowable stresses in accordance with the American Institute of Steel Construction, Inc. (AISC) except that steel supports carrying gravity loads shall be stressed no more than 50% of the yield stress in bending. D. Connections in the coping stone: Straps, hooks, anchors, and other devices shall be designed to carry the design loads with safety factors not less than listed in ILIA Technote on Safety Factors. E. Attachment to the Structure: Connections and attachments to the structure of secondary farming shall be designed to carry the design loads with safety factors or allowable stresses in accordance with the following: Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

11 1. Welds: structural welding code (AWS d1.1 and AISC). 2. Expansion bolts: Per ICBO evaluation report for the specific bolt to be used. If an ICBO report is not available, use not less than the following: i. Safety Factors: Into 4,000 psi concrete-4 to 1 Into grouted CMU- 6 to 1 The combined load factor for combined tension and shear shall satisfy the ILIA Technote on Safety Factors. 3. Bolts: AISC (American Institute of Steel Construction) F. Provisions for Fabrication and Erection Tolerances: Design, detail and fabricate connection to provide allowance for fabrication tolerances, erection tolerances, and structural deflections. G. Control of Corrosion: Prevent galvanic and other forms of corrosion by insulating metals and other materials from direct contact with non-compatible materials, or by suitable coating. 1.6 SUBMITTALS A. Product Data: Submit manufacturer s technical data for all stone, stonework accessories, and other manufactured products required. B. Shop Drawings: Submit cutting and setting drawings indicating sizes, dimension, sections and profiles of stones; arrangement and provisions for jointing, supporting, anchoring and bonding stonework; and details showing relationship with, attachment to, and reception or, related work. C. Samples: Submit sample: Limestone samples to match existing coping stone exactly. 1.7 QUALITY ASSURANCE 1. Sealant samples for each type and color of joint sealant required. A. Single source responsibility for stone: Obtain limestone from a single quarry source with resources to provide materials of specified consistent quality. The fabricator and the quarry shall have sufficient capacity to quarry, cut, and deliver the stonework on schedule. Both fabricator and quarry must be members in good standing of Indiana Limestone Institute. B. Single source responsibility for mortar materials: Obtain mortar ingredients of uniform quality and from one manufacturer for each cementitious and admixture component and from one source or producer for each aggregate. C. Single source responsibility for other materials: Obtain each type of stone accessory, sealants, and other materials from one manufacturer of each product. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

12 D. Information on Drawings and in Specifications establishes requirements for both aesthetic effects and performance of the limestone. Aesthetic effects are indicated by dimensions, arrangement, alignment and profiles of components and assemblies as they relate to sight lines and relationships to one another and to adjoining work. Performance is indicated by criteria that is subject to verifications by either preconstruction or field test, if applicable, or by in service experience. Do not modify intended aesthetic effects, as judged solely by Architect, except with Architect s approval and only the extent exclusively needed to comply with performance requirements. Where modifications are proposed, submit comprehensive explanatory data to Architect for review and approval. E. Installer qualifications: Engage an installer with not less than 10 years experience and who has successfully completed stonework similar in material, design and extent to that indicated for this project. Submit list of completed projects; include names, addresses, and name of Architects and Owners. F. Field Constructed Mock-Up: Prepare mock-ups for the stonework in conjunction with brick masonry mock-up. Purpose of mock-ups is further verification of selections made for color and finish under sample submittals and establishing standard of quality for aesthetic effects expected in completed work. Build mock-ups to comply with the following requirements: 1. Locate mock-ups on site as directed by Architect. 2. Build mock-ups containing elements typical of the stonework in this project, limestone, joint sealants. 3. Erect mock-ups only after notifying Architect when construction will begin. 4. Retain mock-ups during construction as standard for judging completed stonework. When directed, demolish mock-ups and remove from site. 5. Acceptable mock-up may be incorporated into the work at Architect/Owner s discretion. 1.8 DELIVERY, STORAGE AND HANDLING A. Deliver masonry material to project in undamaged condition. B. Store and handle stone and related materials to prevent their deterioration or damage. 1. Do not use pinch or wrecking bars on stonework. 2. Lift with wide-belt type slings where possible; do not use wire rope or ropes containing tar or other substances which might cause staining. 3. Store stone on non-staining wood skids or pallets, covered with nonstaining, waterproof membrane. Place and stack skids and stone to distribute weight evenly and to prevent breakage or cracking of stones. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

13 1.9 PROJECT CONDITIONS 4. Store cementitious materials off the ground, under cover and in dry location. A. Protect stonework during erection as follows: PART 2 - PRODUCTS 2.1 MATERIALS, GENERAL 1. Cover top of walls with non-staining waterproof sheeting at end of each day s work. Cover partially completed structures when work is not in progress. Extend cover a minimum of 24 down both sides and hold securely in place. 2. Prevent staining of stone from mortar, grout, sealants, and other sources. Immediately remove such materials, from stone without damage to the stonework. 3. Protect base of walls from rain-splashed mud and mortar splatter by means of coverings spread on ground and over wall surface. 4. Protect sills, ledges, and projections from droppings of mortar and sealant. A. Comply with referenced standards and other requirements indicated applicable to each type of material required. 2.2 LIMESTONE A. Limestone Building Stone Standard ASTM C-568. B. Classification: Category II (Medium Density) C. Finish of exterior limestone as follows: 1. Finish Indiana Limestone to match existing coping stones exactly. Saw marks will be cause for Architect to reject stone. 2.3 MORTAR AND GROUT MATERIALS A. Portland Cement ASTM C-150, type I, except Type III may be used for cold weather construction. Provide cement as needed to match mortar color onsite exactly. B. Hydrated Lime: ASTM C-207, Type S. C. Aggregate: ASTM C-144 D. Water: Clean, non-alkaline, and potable. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

14 2.4 STONE ANCHORS AND ATTACHMENTS A. Provide anchors and attachments of type and size required to support the stonework fabricated from the following metals for conditions indicated below: 1. Stainless steel, AISI Type 304 or 316, for anchors embedded within the stone. 2. Hot-Dip galvanized steel as follows: i. For anchor bolts, nuts and washers not in direct contact with stone; comply with ASTM A-307, Grade A, for material and ASTM C-153, Class C, for galvanizing. 3. For steel plates, shapes and bars not in direct contact with stone, comply with ASTM A-36 for materials and ASTM A-123 for galvanizing. 4. For expansion bolts not in direct contact with stone use zinc plated or cadmium plated bolts with stainless steel expansion clips. 5. For steel angles supporting limestone, comply with ASTM A-36 for materials and ASTM A-123 for galvanizing. Supports protected with one shop coat or zinc-rich or other rust-inhibiting paint, and one job coat of similar, compatible paint, may be used at the discretion of the Architect. B. Dovetail slots: Where required, Furnish dovetail slots, with filler strips, of slot size required to receive anchors provided, fabricated from (22 gauge) galvanized sheet steel complying with ASTM C-446, G STONE ACCESSORIES A. Setting shims: Lead, or plastic shims, non-staining to stone, sized to suit joint thicknesses and bed depths of stonework involved without intruding into required depths of joint sealants. B. Concealed Sheet Metal Flashing: Fabricate from copper to match existing C. Cotton Weeps: Provide cotton weeps 16 o.c. and of length required to extend between exterior face of stone and cavity behind. D. Lead Stone Flashing Weathercap: Molded Tee-Cap weatherproofing product manufactured from lead designed to be used with building sealant for weatherproofing masonry joints see Specifications Section 2.6 ELASTOMERIC SEALANTS A. All sealants shall be compatible with stone, non-staining, one part systems and compatible with other components (backer rod, primer) as required. B. Provide backer rod and primer as required for sealants to comply with requirements for a complete and proper installation of elastomeric sealants. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

15 C. Acceptable Manufacturer s/products 2.7 MORTAR AND GROUT MIXES 1. Spectrem 1 manufactured by Tremco: 3735 Green Road, Beachwood, OH 44122, Phone MP1 manufactured by BASF Sonneborn: 889 Valley Park Drive, Shakapoe, MN 55379, Phone Sikaflex 1A manufactured by Sika Corporation: 201 Polito Avenue, Lyndhurst, NJ Dymonic manufactured by Tremco: 3735 Green Road, Beachwood, OH 44122, Phone A. General: Do not add mixtures including air-entraining agents, accelerators, retarders, water repellant agents, anti-freeze compounds, or calcium chloride, unless otherwise indicated. B. Mixing: Combine and thoroughly mix cementitious materials, water and aggregates in a mechanical batch mixer; comply with referenced ASTM standard for mixing time and water content, unless otherwise indicated. C. Setting mortar: Comply with ASTM C-270, Proportion Specification, for types of mortars and applications required below, unless otherwise indicated. Set Indiana Limestone with Type N mortar. Match color, profile and texture of existing mortar joints. PART 3 EXECUTION 3.1 EXAMINATION A. Installer shall be required to examine surfaces to receive stonework and conditions under which stonework will be installed and to report in writing any conditions which are NOT in compliance with requirements. DO not proceed with installation until surfaces and conditions comply with requirements indicated in specifications or elsewhere for execution of other work which affects stonework. 3.2 PREPARATION A. Coordinate specific requirements relating to placement of inserts, flashing reglets and similar items which will be used by stonework installer for anchoring, supporting and flashing of stonework with other trades. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

16 3.3 SETTING STONE, GENERAL A. Execute stonework by skilled mechanics, and employ skilled stone fitters at the site to do necessary field cutting as stones are set. B. Contiguous work: provide chases, reveals, reglets, openings and other spaces as indicated on the shop drawings for accommodating contiguous work. Close up opening in stonework after other work is in place with stonework which matches that already set. C. Set stones to comply with requirements indicated on drawings and final shop drawings. Install anchors, supports, fasteners and other attachments indicated or necessary to secure stonework in place. Shim and adjust anchors, supports and accessories to set stones accurately in locations indicated with uniform joints of widths indicated and with edge faces aligned according to established relationships and indicated tolerances. D. Provide mortar joints to match existing color, texture and profile. New mortar joints shall not be discernible from existing at completion of work. 3.4 ADJUSTING AND CLEANING A. Contractor shall take all precautions to not damage stone. The criteria for acceptance of chips and repairs will be per standards and practices of the industry unless other criteria are mutually agreed upon by the limestone supplier and the Architect. B. Remove and replace stonework of the following description: 1. Stones so damaged that repair is impossible, either structurally or aesthetically. 2. Defective joints. 3. Stones and joints not in conformance with approved samples and field-constructed mock-ups. 4. Stonework not complying with other requirements indicated. C. Replace in manner which results in stonework conforming to approved samples and fieldconstructed mock-ups, complying with other requirements and showing no evidence of replacement. D. Clean stonework using clean water and stiff bristle fiber brushes. Do not use wire brushes, acid type cleaning agents, or other materials, or methods which could damage stone. Mechanical or pressure cleaning methods may be used if approved by Architect. Protect limestone when adjacent brick is being acid-washed. Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

17 3.5 PROTECTION A. Provide final protection and maintain conditions, in a manner acceptable to fabricator and installer, which ensures stonework being without damage or deterioration at time of substantial completion. END OF SECTION Project #260822, Computer Science Roof Replacement August 28, 2017 Missouri University of Science and Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing

18 THIS PAGE INTENTIONALLY LEFT BLANK. Project #260822, Computer Science Roof Replacement July 24, 2017 Missouri University of Science & Technology, Rolla, MO Removal and Replacement of Existing Coping Stone, Repointing and Installation of Lead Stone Flashing