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HomeMy WebLinkAbout04720.pdf BICKFORD OF CARMEL, IN 12/12/2012 CAST STONE 04720 - 1 SECTION 04720 - CAST STONE PART 1 - GENERAL 1.1 SUMMARY A. This Section includes the following: 1. Cast stone sills. 1.2 SUBMITTALS A. Product Data: Include dimensions of individual components. B. Shop Drawings: Show fabrication and installation details for cast stone units. Include dimensions, details of reinforcement and anchorages if any, and indication of finished faces. C. Samples: For each color and texture of cast stone required. D. Colored Mortar Samples: For each mortar color required. E. Qualification Data: For manufacturer. F. Material Test Reports. 1.3 QUALITY ASSURANCE A. Manufacturer Qualifications: A qualified manufacturer of cast stone units similar to those indicated for this Project, with sufficient production capacity to manufacture required units. 1. Manufacturer is a producing member of the Cast Stone Institute. PART 2 - PRODUCTS 2.1 CAST STONE UNITS A. Provide cast stone units complying with ASTM C 1364 using the vibrant dry tamp or wet-cast method as approved by manufacturer. 1. Provide units that are resistant to freezing and thawing. 2. Slope exposed horizontal surfaces 1:12, unless otherwise indicated. 3. Provide drips on projecting elements, unless otherwise indicated. B. Cure units by one of the following methods as approved by manufacturer: 1. Cure units with steam in enclosed curing room at temperature of 105 deg F or above and 95 to 100 percent relative humidity for 6 hours. BICKFORD OF CARMEL, IN 12/12/2012 CAST STONE 04720 - 2 2. Cure units with dense fog and water spray in enclosed warm curing room at 95 to 100 percent relative humidity for 24 hours. 3. Cure units to comply with one of the following: a. Not less than 5 days at mean daily temperature of 70 deg F or above. b. Not less than 6 days at mean daily temperature of 60 deg F or above. c. Not less than 7 days at mean daily temperature of 50 deg F or above. d. Not less than 8 days at mean daily temperature of 45 deg F or above. C. Acid etch units after curing to remove cement film from surfaces to be exposed to view if approved by manufacturer. D. Size: As indicated on the drawings. E. Color: “Buff”, as selected by architect from manufacturers standard colors to match the manufactured stone trim units specified in 04860. 2.2 ACCESSORIES A. Anchors and Dowels: Hot-dip galvanized steel. B. Proprietary Acidic Cleaner: Manufacturer's standard-strength, general-purpose cleaner complying with requirements in Division 4 Section "Unit Masonry Assemblies" and approved for intended use by cast stone manufacturer and approved by cleaner manufacturer for use on cast stone and adjacent masonry materials. 2.3 MORTAR A. Comply with requirements in Division 4 Section "Unit Masonry Assemblies" for mortar materials and mixes. 1. For setting mortar, use Type N. 2. For pointing mortar, use Type N. 3. Pigmented Mortar: Use colored cement product matching that used for brick installation. PART 3 - EXECUTION 3.1 SETTING CAST STONE IN MORTAR A. Install cast stone units to comply with requirements in Division 4 Section "Unit Masonry Assemblies." B. Set units in full bed of mortar with full head joints, unless otherwise indicated. 1. Staple builders paper or felt to substrate overlapping seams at least 4 inches, installing lowest sheets first. Stagger lap at least a minimum of 8 inches when starting new sheet. 2. Anchor metal lath to substrate through builders paper or felt with 3. Fill dowel holes and anchor slots with mortar where required. 4. Fill collar joints solid as units are set. 5. Build concealed flashing into mortar joints as units are set. BICKFORD OF CARMEL, IN 12/12/2012 CAST STONE 04720 - 3 6. Keep head joints in coping and other units with exposed horizontal surfaces open to receive sealant. 7. Keep joints at shelf angles open to receive sealant. C. Rake out joints for pointing with mortar to depths of not less than 3/4 inch. Rake joints to uniform depths with square bottoms and clean sides. Scrub faces of units to remove excess mortar as joints are raked. D. Point mortar joints by placing and compacting mortar in layers not greater than 3/8 inch. Compact each layer thoroughly and allow it to become thumbprint hard before applying next layer. E. Tool exposed joints slightly concave when thumbprint hard, using a jointer larger than joint thickness, unless otherwise indicated. F. Provide expansion, control, and pressure-relieving joints of widths and at locations indicated. Keep joints free of mortar and other rigid materials. G. Prepare joints indicated to receive sealant and apply sealant of type and at locations indicated to comply with applicable requirements in Division 7 Section "Joint Sealants." 3.2 SETTING ANCHORED CAST STONE WITH SEALANT-FILLED JOINTS A. Set cast stone units accurately in locations indicated with edges and faces aligned. 1. Install anchors, supports, fasteners, and other attachments to secure units in place. 2. Shim and adjust anchors, supports, and accessories. B. Fill anchor holes with sealant. Where dowel holes occur at pressure-relieving joints, provide compressible material at ends of dowels. C. Set cast stone supported on clip or continuous angles on resilient setting shims. Hold shims back from face of cast stone a distance at least equal to width of joint. D. Keep joints free of mortar and other rigid materials. Remove temporary spacers from joints after anchors and supports are secured in place and cast stone units are anchored. E. Prepare joints and apply sealant of type and at locations indicated to comply with applicable requirements in Division 7 Section "Joint Sealants." 3.3 INSTALLATION TOLERANCES A. Variation from Plumb: Do not exceed 1/8 inch in 10 feet, 1/4 inch in 20 feet, or 1/2 inch maximum. B. Variation from Level: Do not exceed 1/8 inch in 10 feet, 1/4 inch in 20 feet, or 1/2 inch maximum. C. Variation in Joint Width: Do not vary joint thickness more than 1/8 inch in 36 inches or one- fourth of nominal joint width, whichever is less. BICKFORD OF CARMEL, IN 12/12/2012 CAST STONE 04720 - 4 D. Variation in Plane between Adjacent Surfaces (Lipping): Do not vary from flush alignment with adjacent units or adjacent surfaces indicated to be flush with units by more than 1/16 inch, except due to warpage of units. 3.4 ADJUSTING AND CLEANING A. Remove and replace stained and otherwise damaged units and units not matching approved Samples. Cast stone may be repaired if methods and results are approved by Architect. 1. Replace units in a manner that shows no evidence of replacement. B. In-Progress Cleaning: Clean cast stone as work progresses. 1. Remove mortar fins and smears before tooling joints. 2. Remove excess sealant immediately, including spills, smears, and spatter. C. Final Cleaning: After mortar is thoroughly set and cured, clean exposed cast stone to comply with requirements in Division 4 Section "Unit Masonry Assemblies." END OF SECTION 04720