SECTION 04 74 03 – CALCIUM SILICATE STONE CLADING

SECTION 09 75 13 – INTERIOR CALCIUM SILICATE STONE FACING

SPECIFIER’S NOTE: Upchurch Kimbrough distributesseveral of Arriscraft’s calcium silicate products for various types of installations. This specification includes “thin” products that have been manufactured with kerfs in the top and bottom of each unit so that units can be mechanically anchored into a proprietary support system. The system is appropriate for use on building exteriors if the joints are sealant filled.

SPECIFIER’S NOTE: Sealants are assumed to be specified separately in Division 07. Insert requirements if required.

SPECIFIER’S NOTE: Revise this Section for your project by deleting and inserting text to meet Project-specific requirements.

PART 1 - GENERAL

1.1SECTION INCLUDES

  1. Calcium silicate manufactured stone masonry units mechanically anchored (field installed) on a metal-grid system.

1.2RELATED SECTIONS

SPECIFIER’S NOTE: Retain Sections in subparagraphs below that contain requirements Contractor might expect to find in this Section but are specified in other Sections.

  1. Division04 Section “Unit Masonry” for stone trim in unit masonry walls.
  2. Division04 Section “Unit Masonry” forconcealed flashing.
  3. Division07 Section “Sheet Metal Flashing and Trim” for exposed sheet metal flashing.
  4. Division07 Section “Joint Sealants” for sealant and backing materials used to fill open joints and kerfs..

1.3DEFINITIONS

  1. Calcium Silicate ManufacturedStone Cladding System: An exterior wall covering system consisting of calcium silicate manufacturedstone panels[and trim] together with anchors, [backup structure,] [secondary weather barrier (sheathing),] fasteners, and sealants used to secure the stone to building structure and to produce a weather-resistant covering.
  2. Backup structure includes metal-grid system.

1.4PERFORMANCE REQUIREMENTS

SPECIFIER’S NOTE: Delete this article if using for interior application

SPECIFIER’S NOTE: Delete this Article if anchoring systems are fully detailed on Drawings or if authorities having jurisdiction require structural engineer of record to take full responsibility for structural design. See Evaluations. If deleting this Article, give a copy of it to Project's structural engineer as an example of design requirements for dimension stone cladding systems.

  1. General: Design stone anchors and anchoring systems according to ASTMC1242.
  2. Structural Performance: Provide calcium silicate manufacturedstone cladding system capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated:

SPECIFIER’S NOTE: Requirements under each set of performance criteria below are examples only. Revise to suit Project. Consult a structural engineer experienced in engineering dimension stone assemblies of type indicated to quantify design loads applicable to Project. Verify compliance with codes. See Evaluations.

  1. Wind Loads: Determine loads based on the following minimum design wind pressures:
  2. Uniform pressure of [20 lbf/sq. ft.] [25 lbf/sq. ft.] [30 lbf/sq. ft.] <Insert design wind pressure>, acting inward or outward.

SPECIFIER’S NOTE: Delete last subparagraph above or subparagraph below. If retaining below, indicate pressures on appropriate elevation Drawings.

  1. Uniform pressure as indicated on Drawings.

SPECIFIER’S NOTE: Delete subparagraph below if not required.

  1. Equipment Loads: Allow for loads due to window cleaning and maintenance equipment.

SPECIFIER’S NOTE: Revise first paragraph and subparagraph below to indicate specific loads determined by Project's structural engineer. Model building codes and ASCE7 establish criteria for buildings subject to earthquake motions. Verify requirements of authorities having jurisdiction.

  1. Horizontal Building Movement (Interstory Drift): Allow for maximum horizontal building movement equal to quotient resulting from dividing floor-to-floor height at any floor by 400.

SPECIFIER’S NOTE: Retain first paragraph below for concrete frame buildings only; verify factor with Project's structural engineer.

  1. Shrinkage and Creep: Allow for progressive vertical shortening of building frame equal to 1/8 inch in 10 feet.

SPECIFIER’S NOTE: Delete first paragraph and subparagraphs below if prefabricated systems are not used. Revise criteria below if applicable after determining deflection that stone can withstand.

  1. Limit deflection in each prefabricated assembly caused by indicated loads and thermal movements, acting singly or in combination with one another, to not more than [1/720] <Insert ratio> of assembly's clear span or the following, whichever is smaller:
  2. 1/16 inch, measured in plane of wall.
  3. 1/4 inch, measured perpendicular to wall.
  4. Provisions for Fabrication and Erection Tolerances: Allow for fabrication and erection tolerances of building's structural system. [Concrete fabrication and erection tolerances are specified in Division03 Section “Cast-in-Place Concrete.” ] [Structural-steel fabrication and erection tolerances are specified in Division05 Section “Structural Steel Framing.” ]
  5. Provision for Deflection of Building Structure: Allow for the following:
  6. Deflection due to Weight of Calcium Silicate ManufacturedStone Cladding System: Allow for 1/4-inch vertical deflection in 20-foot span of structural members supporting calcium silicate manufacturedstone cladding system.

SPECIFIER’S NOTE: Revise subparagraph above and below to suit Project conditions. Note that stone cladding must be designed to withstand combination of deflection above and below. Delete above if Contractor is responsible for design of framing system that supports stone and framing system is supported only on building columns. Delete below if stone framing system does not include nor is connected to floor or roof spandrel beams or slab edge.

  1. Live Load Deflection: Allow for 1/4-inch vertical deflection, in 20-foot span of structural members supporting calcium silicate manufacturedstone cladding system, due to live loads imposed on building's structural frame after stone installation.

SPECIFIER’S NOTE: Paragraph below is an example of performance requirements for dimension stone cladding system that is part of a curtain wall, such as prefabricated panels. A system that contains weep holes cannot comply with requirements indicated unless it contains a secondary weather barrier that complies with requirements.

  1. Leakage Resistance, Water and Air: Provide calcium silicate manufacturedstone cladding system that complies with the following:

SPECIFIER’S NOTE: Revise values in both subparagraphs below to suit Project. ASTME283 requires using a static-air-pressure differential of 1.57 lbf/sq. ft., unless otherwise indicated, which is equivalent to a 25-mph wind. AAMA's “Curtain Wall Design Guide Manual” states that an air leakage not exceeding 0.06 cfm/sq. ft. at static-air-pressure differential of 1.57 lbf/sq. ft. represents good performance for fixed glass and panel areas of a curtain wall.

  1. Air Infiltration: Not more than [0.004 cfm/sq. ft.] [0.06 cfm/sq. ft.] <Insert allowable infiltration rate> of wall area, as measured by testing mockup per ASTME283 at a differential pressure of [1.57 lbf/sq. ft.] <Insert pressure.>

SPECIFIER’S NOTE: Water test pressure of 20 percent of wind-load design pressure provides satisfactory performance in most parts of the U.S. Locations where high winds and heavy rains frequently occur simultaneously require higher test pressures. Lower test pressures are acceptable for some locations. Revise subparagraph below to suit Project.

  1. Water Penetration: No uncontrolled water penetration beyond plane of back of calcium silicate manufacturedstone cladding system that is not contained or drained back to exterior, as measured by testing mockup per ASTME331 at a differential pressure of [20 percent of positive design wind load, but not less than 10 lbf/sq. ft.] <Insert pressure.>
  1. Control of Corrosion and Staining: Prevent galvanic and other forms of corrosion as well as staining by isolating metals and other materials from direct contact with incompatible materials. Use materials that do not stain exposed surfaces of stone and joint materials.

SPECIFIER’S NOTE: Insert other performance requirements for thermal insulating performance, condensation resistance, etc., if required.

1.5SUBMITTALS

  1. Product Data: For each type of product indicated.
  2. Shop Drawings: Show fabrication and installation details for calcium silicate manufacturedstone cladding system, including dimensions and profiles of stone units.
  3. Show locations and details of joints both within calcium silicate manufacturedstone cladding system and between calcium silicate manufacturedstone cladding system and other construction.
  4. Include details of sealant joints.
  5. Show locations and details of anchors[and backup structure].

SPECIFIER’S NOTE: Retain subparagraph below if products are required to withstand specific design loads and design responsibilities have been delegated to Contractor. Professional engineer qualifications are specified in Division01 Section “Quality Requirements.”

  1. For installed products indicated to comply with design loads, include structural analysis data signed and sealed by the qualified professional engineer responsible for their preparation.
  1. Samples: For each type calcium silicate manufactured stone type indicated in the form of [small scale units][full size units].

SPECIFIER’S NOTE: Coordinate paragraph below with qualification requirements in Division01 Section “Quality Requirements” and as supplemented in “Quality Assurance” Article.

  1. Qualification Data: For [Installer] [fabricator] [professional engineer].

1.6QUALITY ASSURANCE

  1. Installer Qualifications: A firm or individual experienced in installing calcium silicate manufactured stone cladding systems similar in material, design, and extent to that indicated for this Project, whose work has a record of successful in-service performance.
  2. Fabricator Qualifications: Shop that employs skilled workers who custom-fabricate calcium silicate manufactured stone cladding systems similar to that required for this Project and whose products have a record of successful in-service performance.

SPECIFIER’S NOTE: Delete subparagraphs below if Contractor is not required to assume responsibility for engineering.

  1. Fabricator's responsibilities include fabricating calcium silicate manufactured stone cladding and providing professional engineering services needed to assume engineering responsibility.
  2. Engineering Responsibility: Comprehensive engineering analysis by a qualified professional engineer.
  1. Source Limitations for Stone: Obtain calcium silicate manufactured stone, from a single manufacturing plant with resources to provide materials of consistent quality in appearance and physical properties.
  2. Source Limitations for Other Materials: Obtain each type of calcium silicate manufactured stone accessory[,sealant,] and other material from a single manufacturer for each product.

SPECIFIER’S NOTE: Delete paragraph and subparagraphs below if not required. If retaining, indicate location and other details of mockups on Drawings or by inserts. Revise wording if only one mockup is required.

  1. Mockups: Build mockups to verify selections made under sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution.

SPECIFIER’S NOTE: Retain subparagraph below for large-scale mockup or include in Division01 Section “Quality Requirements.” Indicate on Drawings' portion of wall represented by mockup or draw mockup as separate element.

  1. Build mockup of typical wall area as shown on Drawings.

SPECIFIER’S NOTE: Retain subparagraph below for limited mockups.

  1. Build mockups of typical exterior wall with dimension stone cladding, approximately 48 inches long by 48 inches high.

SPECIFIER’S NOTE: Retain any of first three subparagraphs below with either subparagraph above. Delete items not applicable; add others to suit Project.

  1. Show typical components, attachments to building structure, and methods of installation.

SPECIFIER’S NOTE: Retain first subparagraph below to show materials and methods used for through-wall flashing if required.

  1. Include through-wall flashing installed for a 24-inch length in corner of mockup approximately 16 inches down from top of mockup, with a 12-inch length of flashing left exposed to view (omit stone masonry above half of flashing).

SPECIFIER’S NOTE: Retain following for metal or wood frame backup construction and edit accordingly.

  1. Include [metal] [wood] studs, sheathing, veneer anchors, flashing, and weep holes in exterior calcium silicate manufactured stone-veneer wall mockup.

SPECIFIER’S NOTE: Retain following for concrete backup construction and edit accordingly.

  1. Use 4-inch CMU masonry backup in place of full-width CUM where approved by the Architect, veneer anchors, flashing, and weep holes in exterior stone-veneer wall mockup.

SPECIFIER’S NOTE: Retain following for concrete backup construction and edit accordingly.

  1. Use metal studs and cementitious backerboard sheathing in place of concrete where approved by the Architect, veneer anchors, flashing, and weep holes in exterior stone-veneer wall mockup.
  2. Include window opening with stone [returns] [trim].
  3. Include sealant-filled joint complying with requirements in Division07 Section “Joint Sealants.”
  1. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless such deviations are specifically approved by Architect in writing.

SPECIFIER’S NOTE: Retain subparagraph below if mockups are erected as part of building rather than separately and the intention is to make an exception to the default requirement in Division01 Section “Quality Requirements” for demolishing and removing mockups when directed, unless otherwise indicated.

  1. Approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.7DELIVERY, STORAGE, AND HANDLING

  1. Store and handle calcium silicate manufactured stone and related materials to prevent deterioration or damage due to moisture, temperature changes, contaminants, corrosion, breaking, chipping, and other causes.
  2. Store calcium silicate manufactured stone on wood skids or pallets with nonstaining, waterproof covers. Arrange to distribute weight evenly and to prevent damage to calcium silicate manufactured stone. Ventilate under covers to prevent condensation.

1.8PROJECT CONDITIONS

  1. Protect calcium silicate manufactured stone cladding during erection as follows:
  2. Cover tops of calcium silicate manufactured stone cladding installation with nonstaining, 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 inches down both sides and hold securely in place.
  3. Prevent staining of calcium silicate manufactured stone from sealants and other sources. Immediately remove such materials without damaging calcium silicate manufactured stone.
  4. Protect base of walls from rain-splashed mud by coverings spread on ground and over wall surface.
  5. Protect sills, ledges, and projections from sealant droppings.

SPECIFIER’S NOTE: Delete paragraph below if sealants are not specified in this Section.

1.9COORDINATION

SPECIFIER’S NOTE: Delete first paragraph below if not applicable.

  1. Coordinate installation of inserts that are to be embedded in concrete or masonry, flashing reglets, and similar items to be used by calcium silicate manufactured stone cladding Installer for anchoring, supporting, and flashing of calcium silicate manufactured stone cladding system. Furnish setting drawings, templates, and directions for installing such items and deliver to Project site in time for installation.
  2. Time delivery and installation of calcium silicate manufactured stone cladding to avoid extended on-site storage and to coordinate with work adjacent to dimension stone cladding.

PART 2 - PRODUCTS

2.1CALCIUM SILICATE MANUFACTURED STONE

  1. Products: Subject to compliance with requirements, provide Arriscraft International Inc. Arris ClipRenaissance Units as distributed by the Upchurch Kimbrough Company, Houston, Texas (713-957-1520;

SPECIFIER’S NOTE: Edit following paragraphs to meet Project requirements.

  1. Calcium Silicate Manufactured Stone Units: ASTM C 73, Grade SW; solid units having been pressure formed and autoclaved; with kerfs cut into the top and bottom of the units, and having the following typical average properties when tested to the identified standard:

SPECIFIER’S NOTE: Arriscraft manufacturers these projects at plants only in Georgia.

  1. Minimum Compressive Strength: 6815 psi per ASTM C 170.
  2. Maximum Absorption: 10.3 percent per ASTM C 97.
  3. Minimum Density: 120 lbs per cu. ft. per ASTM C 97.
  4. Minimum Modulus of Rupture: 800 psi, to ASTM C 99.
  1. Size:

SPECIFIER’S NOTE: Arriscraft units are available in custom shapes and sizes, up to a maximum length of 23-5/8 inches and face rise of 11-5/8 inches. Bed depths are limited to a maximum of 3-5/8 inches with rocked faced finishes and 4-5/8 inches with smooth faced finishes.

  1. Face Dimension: [3-5/8 by 23-5/8 inches][7-5/8 by 23-5/8 inches][11-5/8 by 23-5/8 inches][as indicated]<insert custom dimension>.
  2. Bed Depth: [1-3/8-inch] <insert dimension>.
  1. Fabrication Tolerances:
  2. Unit Length, Height, and Bed Depth: Plus/minus 1/16 inch.
  3. Deviation from Square: Plus/minus 1/16 inch, with the measurement taken using the longest edge.

SPECIFIER’S NOTE: Consult manufacturers literature for a description of standard finishes listed below.

  1. Finish: [Sandblasted][Rocked][Dressed][Rustic Sawn Finish][Smooth Finish][As indicated]<insert finish> finish. Provide units with indicated profiles including [chamfers,][notches, ][and ][bullnoses].
  2. Trim Units: Provide trim pieces as indicated or as required for a complete installation including corner units and other shapes.
  3. Color: [As selected by Architect from manufacturer’s standard range.]insert color/variety of stone.
  4. Match Architect's samples for color, finish, and other stone characteristics relating to aesthetic effects.

2.2ANCHORS AND FASTENERS

  1. Fabricate anchors from extruded aluminum, ASTMB221, alloy and temper as required to support loads imposed without exceeding allowable design stresses, but not less than strength and durability properties of Alloy6063-T6.
  2. Cast-in-Place Concrete Inserts: Steel, cast iron, or malleable iron adjustable inserts, with bolts, nuts, washers, and shims; all hot-dip galvanized or mechanically zinc coated, with capability to sustain, without failure, a load equal to 4 times the loads imposed as determined by testing per ASTME488, conducted by a qualified independent testing agency.
  3. Postinstalled Anchor Bolts for Concrete and Masonry: [Chemical anchors] [torque-controlled expansion anchors] [or] [undercut anchors] made from stainless-steel components complying with ASTMF593 and ASTMF594, Alloy Group1 or 2 for bolts and nuts; ASTMA666 or ASTMA276, Type304 or 316, for anchors, with capability to sustain, without failure, a load equal to 4 times the loads imposed, for concrete, or 6 times the load imposed, for masonry, as determined by testing per ASTME488, conducted by a qualified independent testing agency.
  4. Threaded Fasteners: Heavy hexagon structural bolts, heavy hexagon nuts, and hardened washers.
  5. For aluminum, use annealed stainless-steel bolts, nuts, and washers; ASTMF593 for bolts; and ASTMF594 for nuts, Alloy Group1.

2.3FRAMING FOR BACKUP STRUCTURE

  1. Metal-Grid Systems: Provide manufacturer's standard integrated system that combines metal struts, fittings, fasteners, and stone anchors and that is engineered expressly for mechanically installing dimension stone cladding and that complies with the following requirements:
  2. Products: Subject to compliance with requirements, provide one Precision Wall Systems, Inc. Gridworx as distributed by the Upchurch Kimbrough Company, Houston, Texas (713-957-1520;
  3. Fittings and Fasteners: System manufacturer's standard components of design, size, and material required to securely attach struts to building structure, by method indicated or selected, and stone anchors to struts, as well as to prevent galvanic corrosion. Fabricate components in contact with stone from same material specified for anchors.

2.4STONE ACCESSORIES