36C25622R0094 061663 Cementitious Sheathing .docx
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- Z2DA--Project #502-19-107 - Replace AHU-104 - Construction - 36C25622R0094 Federal contract opportunity
- Solicitation number
- 502-19-107
About this file
This specification document outlines cementitious sheathing requirements for a construction project to replace air handling unit 104 and ductwork at building 7 of the Department of Veterans Affairs Health Care System in Alexandria, Louisiana. The project number is 502-19-107. Cement board sheathing is required for exterior framed wall construction and must meet ANSI A118.9 and ASTM C1325 standards with a thickness of 5/8 inch and a minimum width of 48 inches. Related accessories like screws, joint reinforcement, and bonding material must be corrosion-resistant and installed according to manufacturer instructions. The sheathing must have a minimum 14 percent total recycled content and is covered by a 10-year manufacturer warranty.
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Text version
REPLACE AHU #104 AND DUCTWORK BLDG. 7
DEPARTMENT OF VETERANS AFFAIRS HEALTH CARE SYSTEM-ALEXANDRIA, LA
PROJECT NO.: 502-19-107
SECTION 06 16 63
CEMENTITIOUS SHEATHING
GENERAL
SUMMARY
Section Includes:
Cement board sheathing at exterior framed wall construction.
APPLICABLE PUBLICATIONS
Comply with references to extent specified in this Section.
American National Standards Institute (ANSI):
A118.910 - Cementitious Backer Units.
ASTM International (ASTM):
C95418 - Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in Thickness C100218 - Steel SelfPiercing Tapping Screws for Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs.
C132514 - NonAsbestos FiberMat Reinforced Cementitious Backer Units.
SUBMITTALS
Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.
Manufacturer's Literature and Data:
Description of each product.
Installation instructions.
Warranty.
Samples:
Cement Board: 200 mm by 200 mm (8 inches by 8 inches), minimum size.
Fasteners: One of each type used.
Provide Sustainable Construction Requirements-Provide in accordance with other Division 1 sections.
DELIVERY AND STORAGE
Deliver products in manufacturer's original sealed packaging.
Mark packaging, legibly. Indicate manufacturer's name or brand, type, production run number, and manufacture date.
Before installation, return or dispose of products within distorted, damaged, or opened packaging.
STORAGE AND HANDLING
Store products indoors in dry, weathertight facility.
Protect products from damage during handling and construction operations.
WARRANTY
Construction Warranty: FAR clause 52.24621, "Warranty of Construction."
Manufacturer's Warranty: Warrant sheathing against material and manufacturing defects.
Warranty Period: 10 years.
PRODUCTS
PRODUCTS - GENERAL
Provide each product from one manufacturer.
Sustainable Construction Requirements:
Sheathing Recycled Content: 14 percent total recycled content, minimum.
SHEATHING
Cement Boards: Meeting ANSI A118.9 and ASTM C1325.
Thickness: 16 mm (5/8 inch) .
Width: 1219 mm (48 inches), minimum.
ACCESSORIES
Steel Drill Screws: Corrosionresistant, selfdrilling.
ASTM C1002, Type S for fastening to framing less than 0.8 mm (33 mils) thick.
ASTM C954 for fastening to framing 0.8 mm (33 mils) thick and greater.
Joint Reinforcement: Alkali resistant tape as recommended by sheathing manufacturer.
Bonding Material: As recommended by sheathing manufacturer.
EXECUTION
PREPARATION
Examine and verify substrate suitability for product installation.
Protect existing construction and completed work from damage.
Verify framing is plumb and in plane.
Correct substrate deficiencies.
SHEATHING INSTALLATION
Install products according to manufacturer's instructions.
Secure units to framing members with screws spaced maximum 200 mm (8 inches) o.c. and not closer than 13 mm (1/2 inch) from edge of unit.
Install screw heads without penetrating cement board surface.
Install sheathing with 6 mm (1/4 inch) gap where sheathing abuts masonry or similar materials to prevent wicking of moisture.
Install sheathing with 10 mm (3/8 inch) gap where nonloadbearing construction abuts structural elements or building expansion joints.
Horizontal Installation: Abut ends of boards over centers of studs. Stagger end joints minimum one stud spacing for adjacent boards. Fasten boards at perimeter and within field of board to each stud.
Vertical Installation: Install board vertical edges centered over studs. Abut ends and edges of each board with those of adjacent boards. Fasten boards at perimeter and with fin field of board to each stud.
Apply bonding material to imbed tape and completely fill board joints, and gaps between each panel.
PROTECTION
Remove loose or spalling joint finish. Patch areas missing joint finish.
Replace broken or damaged boards.
Protect boards from moisture using temporary coverings until finishes are applied.
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