Product Guide Specification
(Revised April 2013)
Specifier Notes: This product guide specification is written according to the Construction Specifications Institute (CSI) 3-Part Format, including MasterFormat, SectionFormat, and PageFormat, as described in The CSI Construction Specifications Practice Guide.
This section must be carefully reviewed and edited by the Architect to meet the requirements of the project and local building code. Coordinate this section with other specification sections and the Drawings. Delete all ≥Specifier Notes≤ after editing this section.
Section numbers and titles are from MasterFormat 2012 Update.
SECTION 04 72 00
CAST STONE MASONRY
Specifier Notes: This section covers cast stone masonry as manufactured by Continental Cast Stone companies. Cast stone masonry is a highly refined architectural precast concrete product manufactured from semi-dry, steam-cured, earth-moist concrete to simulate natural cut stone.
This casting method uses more carefully graded aggregate and less water than architectural precast concrete using conventional methods. The most noticeable benefits are the fine grained texture and the total absence of bug holes. This results in a product that more closely resembles natural cut stone, with improved physical properties.
Consult Continental Cast Stone for assistance in editing this section for the specific application.
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Cast stone masonry.
1.2 RELATED SECTIONS
Specifier Notes: Edit the following list of related sections as required for the project. List other sections with work directly related to the cast stone masonry.
A. Section 04 05 13 – Masonry Mortaring.
B. Section 04 05 16 – Masonry Grouting.
C. Section 04 05 19 – Masonry Anchorage and Reinforcing.
D. Section 04 20 00 – Unit Masonry.
E. Section 07 90 00 – Joint Protection.
A. Cast Stone Masonry: Highly refined architectural concrete stone product, manufactured to simulate fine-grain texture of natural stone.
1.4 REFERENCE STANDARDS
Specifier Notes: List reference standards used elsewhere in this section, complete with designations and titles. This article does not require compliance with standards, but is merely a listing of those used.
A. ASTM C 150 / C 150M – Standard Specification for Portland Cement.
B. ASTM C 1116 / C 1116M – Standard Specification for Fiber-Reinforced Concrete.
C. ASTM C 1364 – Standard Specification for Architectural Cast Stone.
D. Cast Stone Institute Standard Specification (www.caststone.org).
A. Comply with Section 01 33 00 – Submittal Procedures.
B. Product Data: Submit manufacturer’s product data.
Specifier Notes: Continental Cast Stone can assist in the design process by providing various degrees of customization, according to the complexity of the project. Significant cost savings can be achieved by specifying standard or modular-length units, instead of requiring the manufacturer to detail profiles and layout of piece lengths specific to the project. Consult Continental Cast Stone for additional information.
Specify one of the following three paragraphs.
C. Shop Drawings: Submit manufacturer’s shop drawings including profiles, cross sections, reinforcement, exposed faces, arrangement of joints, anchoring methods, anchors, annotation of components, and their locations in project as indicated on the Drawings.
C. Shop Tickets: Submit manufacturer’s shop tickets including profiles, cross sections, modular unit lengths, reinforcement, exposed faces, and annotation of components proposed for use in project according to cross sections as indicated on the Drawings.
C. Catalog Cuts: Submit manufacturer’s catalog cuts showing page and product numbers of units proposed for use in project.
D. Verification Samples: Submit pieces of actual cast stone components, 12 inches (305 mm) square, illustrating range of color and texture to be anticipated in components furnished for project.
E. Test Results: Submit manufacturer’s test results of cast stone components made previously by manufacturer using materials from same sources proposed for use in project.
1.6 QUALITY ASSURANCE
A. Manufacturerπs Qualifications: A Cast Stone Institute Certified Producer, with a minimum of 10 years of experience in producing cast stone of types required for project.
1. Plant shall have adequate capacity to furnish quality, sizes, and quantity of cast stone required without delaying progress of the Work.
2. Products previously produced by plant and exposed to weather shall exhibit satisfactory appearance.
B. Standards: Unless otherwise specified in this section, cast stone shall comply with the following:
1. ASTM C 1364.
2. Cast Stone Institute Standard Specification.
Specifier Notes: Mock-ups are optional and will add expense to the project. Scope of the mock-up construction must be clearly specified or indicated on the Drawings.
Mock-ups allow the Architect to verify:
1. The color and texture of the cast stone.
2. The fit of adjacent components.
3. The quality of construction.
4. The quality of repair methods, if needed.
Revise the following paragraph as required for the project. Delete if mock-ups are not required.
C. Mock-ups: Provide full-size cast stone components for installation in mock-up of exterior wall. Approved mock-ups will become standard for appearance and workmanship.
Specifier Notes: Delete one of the following two sentences.
1. Mock-ups shall remain as part of the completed Work.
1. Mock-ups shall not remain as part of the completed Work. At Architect’s direction, demolish mock-ups and remove debris.
1.7 DELIVERY, STORAGE, AND HANDLING
1. Deliver cast stone components secured to shipping pallets and protected from damage and discoloration.
2. Protect corners from damage.
3. Number each piece individually to match shop drawings and schedules.
1. Store cast stone components and installation materials in accordance with manufacturer’s instructions.
2. Store cast stone components on pallets with nonstaining, waterproof covers.
3. Ventilate under covers to prevent condensation.
4. Prevent contact with dirt.
C. Handling: Protect cast stone components during handling and installation to prevent chipping, cracking, or other damage.
Specifier Notes: Revise the following article as required for the project. Delete if not required.
A. Schedule and coordinate production and delivery of cast stone components with unit masonry work to optimize on-site inventory and to avoid delaying the Work.
PART 2 PRODUCTS
2.2 CAST STONE MASONRY
A. Cast Stone:
1. Compressive Strength: ASTM C 1364.
2. Absorption, Cold Water: ASTM C 1364.
3. Linear Shrinkage: ASTM C 1364.
B. Surface Texture: ASTM C 1364.
C. Color and Finish:
Specifier Notes: Continental Cast Stone can assist in the color selection process by either providing color samples from the wide assortment of existing colors or by custom color matching a color or material chosen by the Architect. Specify one of the following three sentences.
1. Match sample on file at Architect’s office.
Specifier Notes: Insert Continental Cast Stone color number.
1. Continental Cast Stone Color No.: _________________ .
Specifier Notes: Insert name of brick, natural stone, or other material to be matched.
1. Match Color: _________________ .
D. Permissible Variation in Color:
1. Total Color Difference: ASTM C 1364, 6 units.
2. Hue Difference: ASTM C 1364, 2 units.
2.3 CAST STONE MATERIALS
Specifier Notes: Manufacturer will choose type and color of portland cement and aggregates based on the cast stone color specified by the Architect.
A. Portland Cement: ASTM C 150, Type I; white or gray as required to match specified color.
B. Coarse Aggregate: ASTM C 1364; granite, quartz, or limestone.
C. Fine Aggregate: ASTM C 1364, natural or manufactured sands.
D. Coloring Pigments: ASTM C 1364, inorganic iron oxides.
E. Chemical Admixtures: ASTM C 1364.
F. Water: Potable.
Specifier Notes: Specify galvanized or epoxy-coated steel reinforcing bars when reinforcing is required for safe handling, setting, and structural stress.
G. Reinforcement: Where required by ASTM C 1364, [galvanized steel] [epoxy-coated steel].
Specifier Notes: Fiber reinforcement in the form of fibrous nylon to control plastic shrinkage and thermal cracking may be used. Include the following sentence if fiber reinforcement is required.
H. Fiber Reinforcement: ASTM C 1116, fibrous nylon.
2.4 MORTAR MATERIALS
Specifier Notes: Specify the mortar.
A. Mortar: [Cast Stone Institute Standard Specification] [As specified in Section 04 05 13].
Specifier Notes: Specify Type 304 stainless steel anchors for highly corrosive environments, such as coastal areas, and for 100-year type construction.
Anchor pins and dowels should be stainless steel. Shelf angles and other similar structural items should be galvanized steel.
Consult Continental Cast Stone for assistance in specifying anchors for the specific application.
A. Anchors: Non-corrosive type, sized for conditions. [Brass] [Hot-dip galvanized steel] [Type 304 stainless steel].
B. Sealants: As specified in Section 07 90 00.
1. Manufacturer’s standard-strength, general-purpose cleaner designed for removing mortar and grout stains, efflorescence, and other construction stains from new masonry surfaces without discoloring or damaging masonry surfaces.
2. Approved for intended use by cast stone masonry manufacturer and approved by cleaner manufacturer for use on cast stone and adjacent masonry materials.
A. Shapes: Unless otherwise indicated on the Drawings, provide:
1. Suitable wash on exterior sills, copings, projecting courses, and components with exposed top surfaces.
2. Drips on projecting components, wherever possible.
1. As required to withstand handling and structural stresses.
2. Comply with ASTM C 1364.
3. Minimum of 0.25 percent of cross-sectional area of panels which exceed 24 inches (600 mm) in width.
4. Minimum Reinforcing Cover: Twice diameter of reinforcing bars.
5. Units less than 24 inches in either transverse or longitudinal direction may be unreinforced in that direction if structural conditions allow.
Specifier Notes: Curing cast stone components with a direct-fired steam generator as used at Continental Cast Stone provides the following benefits:
1. Increases the first-day strength of the cast stone.
2. Increases the hardness of the corners of the cast stone.
3. Minimizes efflorescence. The carbonation in the steam interacts with the concrete matrix to prevent salts from traveling to the cast stone surface.
1. Cure cast stone components with a direct-fired steam generator at a minimum temperature of 105 degrees F (41 degrees C) for a minimum of 6 hours, within 12 hours of fabrication.
2. Cure cast stone components in presence of carbon monoxide and carbon dioxide to promote carbonation at surface, to minimize efflorescence.
D. Finishing: Remove blemishes from exposed surfaces before packaging for shipment.
E. Manufacturing Tolerances: Manufacture cast stone components within tolerances in accordance with Cast Stone Institute Standard Specification.
2.7 SOURCE QUALITY CONTROL
A. Sampling and Testing: ASTM C 1364.
PART 3 EXECUTION
A. Examine construction to receive cast stone masonry. Notify Architect if construction is not acceptable. Do not begin installation until unacceptable conditions have been corrected.
B. Visual Inspection:
1. Visually inspect cast stone components for fit and finish in accordance with ASTM C 1364 before installation.
2. Do not install unacceptable components.
A. General: Install cast stone masonry in conjunction with unit masonry, complying with Section 04 20 00.
1. Drench cast stone components with clear, running water immediately before installation.
2. Do not use pry bars or other equipment in a manner that could damage cast stone components.
3. Fill dowel holes and anchor slots completely with mortar or non-shrink grout.
4. Set cast stone components in a full bed of mortar, unless otherwise indicated on the Drawings.
5. Fill vertical joints with mortar.
6. Make joints 3/8 inch (9 mm), unless otherwise indicated on the Drawings.
7. Leave head joints in copings and similar components open for sealant.
8. Rake mortar joints 3/4 inch (19 mm) for pointing.
9. Sponge face of each stone to remove excess mortar.
10. Tuck point joints to a slight concave profile.
C. Sealant Joints:
1. Comply with Section 07 90 00.
2. Prime ends of cast stone components, insert properly sized foam backing rod, and install required sealant using sealant gun.
3. Provide sealant joints at following locations and as indicated on the Drawings.
a. Cast stone components with exposed tops.
b. Joints at relieving angles.
c. Control and expansion joints.
3.3 SETTING TOLERANCES
A. Tolerances: Comply with Cast Stone Institute Standard Specification.
1. Variation from Plumb: Do not exceed 1/8 inch in 5 feet (3 mm in 1.5 m) or 1/4 inch in 20 feet (6 mm in 6 m) or more.
2. Variation from Level: Do not exceed 1/8 inch in 5 feet (3 mm in 1.5 m), 1/4 inch in 20 feet (6 mm in 6 m), or 3/8 inch (9 mm) maximum.
3. Variation in Joint Width: Do not vary joint width more than 1/8 inch (3 mm) or 1/4 of nominal joint width, whichever is greater.
4. Variation in Plane Between Adjacent Surfaces: Do not exceed 1/8-inch (3-mm) difference between planes of adjacent components or adjacent surfaces indicated to be flush with components.
A. Surface Repair:
1. Repair chipping and other surface damage noticeable when viewed in direct daylight at 20 feet (6 m).
2. Repair with matching touchup material provided by manufacturer and in accordance with manufacturer’s instructions.
3. Repair methods and results to be approved by Architect.
3.5 FIELD QUALITY CONTROL
A. Inspection and Acceptance: Cast Stone Institute Standard Specification.
A. In-Progress Cleaning:
1. Clean cast stone components as work progresses.
2. Remove mortar fins and smears before tooling joints.
B. Final Cleaning:
1. Clean exposed cast stone, after mortar is thoroughly set and cured.
a. Wet surfaces with water before applying cleaner.
b. Apply cleaner to cast stone in accordance with cleaner manufacturer’s instructions.
c. Remove cleaner promptly by rinsing thoroughly with clear water.
Specifier Notes: The following article is optional. Delete if not required. Consult Continental Cast Stone for additional information regarding the use of water repellant.
3.7 WATER REPELLANT
A. Apply silane or siloxane water repellant for weatherproofing cast stone masonry in accordance with manufacturer’s instructions.
B. Apply water repellant after pointing, repair, cleaning, inspection, and acceptance are completed.
A. Protect installed cast stone masonry from splashing and other damage during construction.
END OF SECTION