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1998-06-10
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SECTION 04720
CAST STONE
NOTE ** Continental Cast Stone Manufacturing, Inc.; precast
components simulating natural stone.
NOTE **
NOTE ** Continental Cast Stone Manufacturing is located at
the following address:
NOTE ** 22001 West 83rd Street
NOTE ** Shawnee, KS 66227
NOTE ** Tel: (913) 422-7575
NOTE ** Fax: (913) 422-7272
NOTE ** email: info@continentalcaststone.com
NOTE **
NOTE ** Cast stone components are custom fabricated to each
installation and allow the look, color, and texture
of cut stone at lower cost.
NOTE **
NOTE ** SECTION 04720 - CAST STONE, Copyright 1997, The
Architect's Catalog, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Delete items below not required for project. Add
other items that may be required.
A. Customized cast stone components for installation in
masonry.
B. Anchors and accessories.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 04065 - Mortar and Masonry Grout.
B. Section 04810 - Unit Masonry Assemblies.
C. Section 04820 - Reinforced Unit Masonry Assemblies.
D. Section 07900 - Joint Sealers.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not
actually required by the text of the edited
section.
A. ACI 318 - Building Code Requirements for Reinforced
Concrete; American Concrete Institute.
B. ASTM A 615/A 615M - Standard Specification for Deformed
and Plain Billet-Steel Bars for Concrete Reinforcement.
C. ASTM C 33 - Standard Specification for Concrete
Aggregates.
D. ASTM C 150 - Standard Specification for Portland Cement.
E. ASTM C 270 - Standard Specification for Mortar for Unit
Masonry.
F. ASTM C 494 - Standard Specification for Chemical
Admixtures for Concrete.
G. ASTM C 642 - Standard Test Method for Specific Gravity,
Absorption, and Voids in Hardened Concrete.
H. ASTM C 979 - Standard Specification for Pigments for
Integrally Colored Concrete.
I. ASTM C 1194 - Standard Test Method for Compressive
Strength of Architectural Cast Stone.
J. ASTM C 1195 - Standard Test Method for Absorption of
Architectural Cast Stone.
K. ASTM D 2244 - Standard Test Method for Calculation of
Color Differences From Instrumentally Measured Color
Coordinates.
L. Technical Manual; Cast Stone Institute.
1.4 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Test results of cast stone components made
previously by the manufacturer.
C. Shop Drawings: Include profiles, cross sections,
reinforcement, exposed faces, arrangement of joints,
anchoring methods, anchors, annotation of components, and
their locations in project.
D. Verification Samples: Pieces of actual cast stone
components not less than 1 ft (305 mm) in length,
illustrating range of color and texture to be anticipated
in components furnished for the project.
1.5 QUALITY ASSURANCE
A. Manufacturer Qualifications: A current producer member
of the Cast Stone Institute, with a minimum of five years
of experience in producing cast stone of the types
required for this project.
1. Plant must 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 must exhibit satisfactory appearance.
B. Standards: Comply with requirements of current edition
of Cast Stone Institute Technical Manual.
NOTE ** Mock-ups are optional and will add expense to the
project. Delete this article if mock-up is not
required.
C. Mock-Up: Provide full size cast stone components for
installation in mock-up of exterior wall. Approved mock-
up will become standard for appearance and workmanship.
1. Mock-up may remain as part of the completed Work.
2. Mock-up may not remain as part of the completed Work;
at Architect's direction, demolish mock-up and remove
debris from project site.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Delivery: Deliver cast stone components secured to
shipping pallets and protected from damage and
discoloration.
B. Storage and Handling: Store cast stone components on
project site to prevent contact with earth. Handle
carefully to avoid chipping and cracking.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Provide cast stone components fabricated by Continental
Cast Stone Manufacturing, Inc.; Shawnee, Kansas 66227.
ASD. Telephone 913-422-7575.
B. Requests for substitutions will be considered in
accordance with provisions of Section 01600.
NOTE ** Delete paragraph above or below; coordinate with
Division 1 requirements.
C. Substitutions: Not permitted.
2.2 CAST STONE COMPONENTS
A. Provide cast stone components with the following
properties:
1. Compressive strength: 6500 psi (44.8 Mpa) minimum at
28 days, per ASTM C 1194.
2. Absorption: 6 percent maximum at 28 days, per ASTM C
1195 or ASTM C 642.
B. Surface Texture: Fine grained, similar to natural stone.
No bugholes or air voids are permitted.
C. Color and Finish: Match sample on file at Architect's
office.
1. Viewing conditions: Compare in direct daylight at 10
feet (3 m), after subjecting to similar aging and
weathering conditions.
2. Maximum variation: 2 percent hue and 6 percent
lightness, chroma, and hue combined; test in
accordance with ASTM D 2244.
2.3 MATERIALS
A. Portland Cement: ASTM C 150, Type I or Type III, white
or gray as required to match Architect's sample.
B. Coarse Aggregate: ASTM C 33, except for gradation;
granite, quartz, or limestone.
C. Fine Aggregate: ASTM C 33, except for gradation; natural
or manufactured sands.
D. Pigments: ASTM C 979, inorganic iron oxides.
E. Admixtures: ASTM C 494.
F. Water: Potable.
G. Reinforcing Bars: ASTM A 615/A 615M, galvanized or epoxy
coated when covered by less than 1-1/2 inch (38 mm) of
cast stone material.
2.4 ACCESSORY PRODUCTS
A. Anchors: Non-corrosive type, sized for conditions.
Provide of brass, hot-dip galvanized steel, or Type 304
stainless steel.
B. Mortar: ASTM C 270, Type N.
NOTE ** Delete paragraph above or below.
C. Mortar: As specified in Section 04065.
D. Sealant: As specified in Section 07900.
2.5 FABRICATION
A. Shapes: Unless otherwise indicated on drawings, provide:
1. suitable wash on exterior sills, copings, projecting
courses, and components with exposed top surfaces.
2. drips on projecting components.
B. Reinforcement: Provide reinforcement as required to
withstand handling and structural stresses.
1. Comply with ACI 318.
2. Provide reinforcement of not less than 1/4 of one
percent of cross section area.
C. Curing and Finishing:
1. Cure 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 components in the presence of carbon monoxide
and carbon dioxide to promote carbonation at the
surface, for efflorescence control.
3. Remove cement film from exposed surfaces prior to
packaging for shipment.
D. Tolerances: Fabricate cast stone components within the
following tolerances:
1. Plus or minus 1/8 inch in all dimensions.
2. Maximum bow, camber, or twist: length/360.
E. Testing: Test compressive strength and absorption of
specimens selected at random from plant production.
1. Test in accordance with referenced testing standards.
2. Select samples at rate of three per 500 cubic feet,
but not less than three.
PART 3 EXECUTION
3.1 INSTALLATION
A. General: Install cast stone components in conjunction
with masonry, complying with requirements of Section
04810.
B. Setting:
1. Drench cast stone components with clear, running
water immediately prior to installation.
2. Fill dowel holes and anchor slots completely with
mortar or non-shrink grout.
3. Set cast stone components in a full bed of mortar
unless otherwise detailed.
4. Fill vertical joints with mortar.
5. Make all joints 3/8 inch (9.5 mm), except as
otherwise detailed.
6. Leave head joints in copings and similar components
open for sealant.
7. Rake mortar joints 3/4 inch (19 mm) for pointing.
Sponge the face of each stone to remove excess
mortar.
8. Tuck point joints to a slight concave profile.
C. Sealant Joints:
1. Comply with requirements of Section 07900.
2. Prime the ends of cast stone components, insert
properly sized foam backing rod, and install sealant
using sealant gun.
3. Provide sealant joints at the following locations and
as otherwise detailed:
a. Cast stone components with exposed tops.
b. Joints under relieving angles.
c. At control and expansion joints.
3.2 TOLERANCES
A. Comply with requirements of Cast Stone Institute
Technical Manual.
B. Set cast stone components within 1/8 inch (3.2 mm) of
plane of adjacent component.
C. Make joints consistent within tolerance of plus 1/16 inch
(1.6 mm) and minus 1/8 inch (3.2 mm).
3.3 ADJUSTING, CLEANING, AND PROTECTION
A. Repair obvious chips with matching touchup material
provided by the manufacturer.
B. Clean cast stone components by wetting with clear running
water.
C. Apply a solution of Sure Clean 600 by ProSoCo Products,
Inc. or equivalent, complying with manufacturer's
instructions.
D. Protect cast stone components from splashing and from
damage by other operations at the project site.
END OF SECTION