SECTION CLAY MASONRY RESTORATION AND CLEANING ADDENDUM NO.6

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1 SECTION ADDENDUM NO.6 PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section SECTION SUMMARY A. Section includes: 1. Building survey. 2. Preparation. 3. Cleaning of all masonry, interior and exterior. 4. Repairs after selective demolition, cleaning of masonry exposed after selective demolition RELATED SECTIONS A. Related Sections include: 1. Section Concrete Restoration 2. Section Joint Sealants 1.04 SUBMITTALS A. Product data for each product indicated including recommendations for their application and use. Include test reports and certifications substantiating that products comply with requirements. B. Samples for verification purposes, prior to erecting the mockup, of the following: 1. Each new exposed masonry material to be used for replacing existing materials. Include in each set of samples the full range of colors and textures to be expected in the completed work. 2. Each type of chemical cleaning material. C. Qualification data for firms and persons specified in the "Quality Assurance" Article to demonstrate their capabilities and experience. Include a list of completed projects with project names, addresses, names of Architects and Owners, and other information specified. D. Restoration program for each phase of the restoration process, including protection of surrounding materials on building and site during operations. Described in detail the materials, methods, and equipment to be used for each phase of the restoration work ( )

2 1. If alternative methods and materials to those indicated are proposed for any phase of restoration work, provide a written description, including evidence of successful use on other comparable projects, and a testing program to demonstrate their effectiveness for this project. E. Cleaning program indicating cleaning process, including protection of surrounding materials on building and site, and control of runoff during operations. Describe in detail the materials, methods and equipment to be used QUALITY ASSURANCE A. Restoration Specialist: Engage an experienced masonry restoration and cleaning firm that has specialized in the types of work required for this project. At Contractor's option, the work may be divided between two separate firms; one for cleaning and one for repair work. 1. Work must be performed by a firm having not less than 5 years successful experience in comparable masonry restoration projects and employing personnel skilled in the restoration processes and operations indicated. 2. Field Supervision: Require restoration specialist firm to maintain an experienced full-time supervisor on the job site during times that clay masonry restoration and cleaning are in progress. B. Field-Construction Mockups: Prior to starting masonry restoration, prepare the following sample panels on the building where directed by Architect. Prepare sample panels using same materials and methods proposed for the work, and under same weather conditions to be expected during the restoration. Obtain Architect's acceptance of visual qualities before proceeding with masonry restoration. Retain acceptable panels in an undisturbed condition, suitably marked, during construction as a standard for judging the completed work. 1. Notify Architect one week in advance of dates and times when sample panels will be prepared. Prepare a minimum of three panels showing various cleaning applications. 2. Cleaning: Demonstrate the materials and methods to be used for cleaning each type of masonry surface and condition on sample panels approximately 25 sq. ft. (2.3m 2 ) in area. a. Test materials and methods on samples of adjacent nonmasonry materials for possible reaction with cleaning materials, except where materials and methods are known to have a deleterious effect on such materials ( )

3 3. Masonry Repair: Prepare sample panels of size indicated for each type of masonry material indicated to be patched, rebuilt or replaced. Erect mock-up panels into an existing wall, unless otherwise indicated, to demonstrate quality of materials and workmanship PROJECT/SITE CONDITIONS A. 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. Erect temporary protection covers as requires. B. Do not clean masonry, or repair masonry unless air temperatures are between 40 degrees F (4 degrees C) and 80 degrees F (27 degrees C) and will remain so for as least 48 hours after completion of work. When temperature falls below 32 degrees F (0 degrees C), provide a temporary enclosure work area, day and night; provide temporary heat. C. Hot weather requirements: protect restoration work when temperature and humidity conditions produce excessive evaporation of water from mortar and patching materials. Provide artificial shade and wind breaks and use cooled materials as required. Do not apply mortar to substrates with temperatures of 90 deg F (32 deg C) and above. D. Prevent grout or mortar used in repointing and repair work from staining face of surrounding masonry and other surfaces. Remove immediately grout and mortar in contact with exposed masonry and other surfaces. E. Protect sills, ledges and projections from mortar droppings. F. Contractor shall be responsible for field verifying hardness of existing mortar joints prior to submitting bid SEQUENCING/SCHEDULING A. Perform masonry restoration work in the following sequence: PART 2 - PRODUCTS 1. Preparation. 2. Cleaning. 3. Patching and Repairs. 4. Final cleaning MASONRY MATERIALS A. Face Brick and Accessories: Provide face brick and accessories, with color, surface texture, and physical properties to match existing face brick or blend of brick. Face brick shall conform ( )

4 to ASTM C 216, Type SW, Grade A MORTAR MATERIALS FOR PATCHING AND REPAIRS; PORTLAND CEMENT LIME MORTAR A. Portland Cement: ASTM C 150, Type I. Low-Alkali, nonstaining cement. B. Hydrated Lime: ASTM C 207, Type S. C. Aggregate for Mortar: ASTM C 144, unless otherwise indicated. 1. For pointing mortar, provide sand with rounded edges. 2. Match size, texture and gradation of existing mortar aggregate as closely as possible. D. Water: Clean, free of oils, acids, alkaline and organic matter. E. Colored Mortar: As follows: 1. Match existing mortar color, after cleaning. a. When attempting to match existing mortar, the Contractor shall submit to a testing laboratory, a sample of the existing mortar to determine it s contents. b. Upon determination of the contents of the existing mortar, the Contractor will produce a wall mock-up using the formula for the existing mortar to create new mortar. The Architect will then review the mock-up for approval. 2. Colored Portland Cement-Lime Mix. a. The Riverton Corporation "Riverton Portland Cement Lime Custom Color." b. Glen-Glenn-Gery Corporation "Color Mortar Blend." c. Lehigh Portland Cement Co. "Lehigh Custom Color Portland/Lime." 3. Mortar Pigments a. Davis Colors "True Tone Mortar Colors." b. Solomon Grind-Chem Services, Inc. "SGS Mortar Colors." 2.03 CLEANING MATERIALS AND EQUIPMENT A. Water for Cleaning: Clean, potable, free of oils, acids, alkalis, salts, and organic matter. B. Warm Water: Heat water to a temperature of 140 to 180 degrees F (60 degrees C to 82 degrees C). C. Brushes: Fiber bristle only ( )

5 D. Job-Mixed Detergent Solution: Solution prepared by mixing 3 oz. (85g) of trisodium phosphate (TSP), 1 oz. (28g)of laundry detergent (Tide, All, etc.), 1 quart (.946l) of 5 percent sodium hypochlorite (bleach), and 3 quarts (2.8l)of warm water for each gallon of solution required. E. Masonry Cleaner 1. Citrus-Based bio-degradable V.O.C. compliant emulsified cleaner/stripper. a. Manufacturer: Conspec "Orange Peel," b. Approved equal. E. If Citrus based cleaner does not produce satisfactory results through test samples as determined by the Architect, a stronger cleaning solution shall be used. Acidic Cleaner: Manufacturer's standard-strength acidic masonry restoration cleaner composed of hydrofluoric acid blended with other acids, including a trace of phosphoric acid, and combined with special wetting systems and inhibitors. 1. Diedrich Technologies, Inc.; "101 Masonry Restorer" and "101G Granite, Terra-Cotta and Brick", Oak Creek, WI, (800) Pro So Co., Inc.; "Sure Klean Restoration Cleaner", Kansas City, KS, (913) Hydrochemical Technologies, Inc.; "Hydroclean HT-626", Hartford, CT, (800) F. Chemical Paint Remover: Manufacturer's standard thixotropic/alkaline formulation for removing paint coatings from masonry. 1. Diedrich Technologies, Inc.; "606 Multi-Layer/606X Extra Thick Paint Remover with pull off removal system", Oak Creek, WI, (800) Pro So Co., Inc.; "EnvironKlean Safety Peel 1 or 3 with Envirno Klean overcoat", Kansas City, KS, (913) Hydrochemical Technologies, Inc.; "Hydroclean HT-300." Hartford, CT, (800) G. Liquid Strippable Masking Agent: Manufacturer's standard liquid, film-forming, strippable masking material for protecting glass, metal, and polished stone surfaces from the damaging effects of acidic and alkaline masonry cleaners. 1. ABR Products, Inc. Rubber Mask, Franklin, WI, (800) Diedrich Technologies, Inc.; "Diedrich Acid Guard", Oak Creek, WI, (800) ProSoCo, Inc.; "Sure Klean Strippable Masking", Kansas City, KS, (913) ( )

6 H. 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. Adjust pressure and volume, as required, to ensure that damage to masonry does not result from cleaning methods JOINT SEALANT A. Refer to Section Joint Sealants 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. Mixing Pointing Mortar: Thoroughly mix cementitious and aggregate materials together before adding any water. Then mix again, adding only enough water to produce a damp, unworkable mix which will retain its form when pressed into a ball. Maintain mortar in this dampened condition for 1 to 2 hours. Add remaining water in small portions until mortar of desired consistency is reached. Use mortar within 30 minutes of final mixing; do not retemper or use partially hardened material. 1. Pointing Mortar: One part Portland cement, one part lime and six parts mortar aggregate. Comply with ASTM C 270, Proportion Specification, Type N, 750 P.S.I. 2. Rebuilding Mortar: Comply with ASTM C 270, Proportion Specification. a. Above Grade Mortar: Type "N" b. Below Grade Mortar: Type "M" 2.07 MISCELLANEOUS MATERIALS A. Horizontal joint reinforcing, anchors and wall ties for patching and repair work. 1. Manufacturers a. Dur-O-Wall b. Southern Construction Products, Inc. c. Southern Wire d. Wire Bond 2. Characteristics: a. Wire Sizes: Fabricate with 9-gage(0.148inch)(3.5mm) side and cross rods, containing a minimum of 90% recycled material, 75% post-consumer steel, ASTM A 82, unless otherwise indicated ( )

7 b. Wire Finish: Provide manufacturer's standard mill galvanized finish for interior walls. For exterior walls hot-dip galvanize joint reinforcing after fabrication to comply with ASTM A 153, Class B-2 coating. c. Brick Veneer/CMU adjustable ties: Horizontal joint reinforcing with adjustable ties, containing a minimum of 90% recycled material, 75% post-consumer steel. Required where face brick coursing does not match CMU coursing. B. Injection Grout: Cement based grout for cracks. PART 3 - EXECUTION 3.01 GENERAL 1. Cathedral Stone Company, Inc.; "Jahn Injection Grout M30, M40 and M50". A. Clay masonry restoration and cleaning materials shall be installed in strict accordance with the manufacturer's current, printed instructions BUILDING SURVEY A. Contractor shall survey masonry and joints in detail to determine repair and patch work necessary for restoration of clay masonry PREPARATION A. Comply with recommendations of manufacturers of organic cleaners and repellents for protecting building surfaces against damage from exposure to their products. B. Protect persons, motor vehicles, surrounding surfaces of building whose masonry surfaces are restored, building site, and surrounding buildings from injury resulting from masonry restoration work. 1. Prevent organic cleaning solutions and repellents 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 or repellent solutions to unprotected surfaces. 3. Dispose of run-off from cleaning and repellent operations by legal means and in manner which prevents soil erosion, undermining of paving and foundations, damage to landscaping, ( )

8 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 operations during course of masonry restoration work. 5. Protect adjacent surfaces from contact with organic cleaners by covering them with a liquid strippable masking agent or polyethylene film and waterproof masking tape. Apply masking agent to comply with manufacturer's recommendations. Do not apply liquid masking agent to painted or porous surfaces CLEANING MASONRY, GENERAL A. Clean clay masonry throughout the building, both interior and exterior. 1. Remove paint droppings from clay masonry walls. B. Proceed with cleaning in an orderly manner. Work from bottom to top of the building for each scaffold drop. C. 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. 1. Rinse off cleaning residue and soil by working upwards from bottom to top of each treated area at each stage on scaffold setting. D. Water Spray Pressure: Comply with the following requirements: 1. Low-Pressure Spray: 100 to 400 psi (690 to 2750 kpa), 3 to 6 gal. per minute (0.25 to 0.4L/s). 2. Medium-Pressure Spray: 400 to 800 psi (2750 to 5500kPa), 3 to 6 gal. per minute (0.25 to 0.4L/s). 3. High-Pressure Spray: 800 to 1200 psi (5500 to 8250kPa), 3 to 6 gal.per minute (0.25 to 0.4L/s). E. Organic Cleaner Application Methods: Comply with chemical manufacturer's recommendations using brush or spray application. Do not spray-apply at pressure exceeding 50 psi. Do not apply more than twice. F. Detergent Cleaning: Clean masonry with a detergent solution as follows: 1. Wet masonry with cold water applied by low-pressure spray. 2. Scrub masonry with detergent solution using medium-soft ( )

9 brushes until soil is thoroughly dislodged and can be removed by rinsing. 3. Rinse masonry with cold water applied by medium-pressure spray. G. Organic Cleaning: Clean brick masonry surfaces with indicated chemical cleaner applied as follows: 3.05 PATCHING 1. Wet masonry with cold water applied by low-pressure spray. 2. Apply organic cleaner to masonry. Let cleaner remain on surface for the period recommended by manufacturer before rinsing away. 3. Rinse masonry with cold water applied by medium-pressure spray. A. Patching and repair of miscellaneous cracks in existing masonry. B. Face Brick: Facade Cracks: As follows, unless otherwise indicated. Crack Size (Width) Procedure 1/64" (.39mm) or less Repoint cracked mortar joints. No brick repair or replacement required. 1/64" (.39mm) to 1/8"(3.0mm) Repoint cracked mortar joints. Pressure inject grout into brick crack or replace face brick. 1/8" (3.0mm) or larger Repoint mortar joint FINAL CLEANING Replace face brick with cracks 1/8" or more in width. A. After mortar has fully hardened thoroughly clean exposed masonry surfaces of excess mortar and foreign matter using stiff nylon or bristly brushes and clean water, spray applied at low pressure. B. Use of metal scrapers or brushes will not be permitted ( )

10 C. Exposed clay masonry surfaces shall be cleaned free of atmospheric dirt, mildew and carbon formation to restore the surfaces to their original appearance APPLICATION OF JOINT SEALANT A. Refer to Section Joint Sealants. B. Replace deteriorated sealant cracked sealant, missing sealant, and sealant not bonded to adjacent surfaces WASTE MANAGEMENT A. Separate and recycle waste materials in accordance with the Waste Management Plan and to the maximum extent economically feasible. B. Fold up packing materials and place in designated area for recycling. C. Collect wood packing shims and pallets and place in designated area. D. Place unused mixed mortar in designated locations where lowerstrength mortar meets the requirements for bulk fill; for example, use as retaining wall footing ballast, cavity fill at grade, or underground utility pipe kickers. E. Separate stone and masonry waste and place in designated area for use as structural fill or in landscaping of the project. END OF SECTION ( )