General Construction Specifications
PART 1 - GENERAL
01 SECTION INCLUDES
A. Miscellaneous rough carpentry as required to complete the work of this project.
B. Blocking and nailers for roof system and related flashings.
C. Plywood panels for mounting electrical and telephone equipment.
02 REFERENCE STANDARDS
A. NFPA - National Design Specification for Stress Grade Lumber and its Fastening.
B. AWPA - American Wood Preservers Association.
C. ASTM E84 - Standard Method for Surface Burning Characteristics of Building Materials.
D. N.F.P.A. - Manual for House Framing.
E. PSI - "U.S. Product Standard for Construction and Industrial Plywood."
F. PS 20 - Softwood Lumber Standard.
1.02 QUALITY ASSURANCE
A. Rough carpentry lumber shall bear visible grade stamps of agency certified by National Forest Products Association (NFPA).
B. Pressure-treated lumber shall conform to AWPA requirements for preservative or fire-retardant treated materials. Treatment plant shall be licensed by manufacturer of treated material.
1.03 SUBMITTALS
A. Submit the following in accordance with Section 01340.
B. Certification of Treating Plant:
1. Wood Preservatives: Submit certificate stating water-borne chemical and process used, net amount of preservative retained, and compliance with applicable standards. Include statement that moisture content of treated lumber was reduced to a maximum of 15% prior to shipment to site.
2. Water-Borne Treatment: Statement that moisture content of treated materials was reduced to levels indicated under 2.01, A.1, prior to shipment to project site.
3. Fire-Retardant Treatment: Submit certificate stating that fire-retardant treatment materials comply with governing ordinances and meet or exceed requirements for ASTM E84 tests. Include a statement that treatment will not bleed through finish surfaces. List materials manufacturer by full name and address.
1.04 DELIVERY, STORAGE, HANDLING
A. Keep materials dry at all times. Protect against exposure to weather and contact with damp or wet surfaces.
1. Stack lumber and plywood in a way to provide air circulation with stacks.
2. Comply with provisions of Sections 01610 and 01620.
PART 2 - PRODUCTS
03 MATERIALS
A. Lumber and timber shall be sound, thoroughly seasoned and well manufactured in compliance with NFPA "National Design Specifications" for Stress Grade Lumber and its Fastenings".
1. Each piece of lumber shall bear an identification stamp of the accredited test agency. Maximum moisture content: 19%.
B. Decay/Insect Resistant Lumber: No. 2 Southern Pine, pressure-treated, clear.
1. Sizes: As indicated on drawings.
C. Fire-Retardant Lumber: No. 2 Southern Pine, pressure-treated, clear, capable of providing flame spread 25, smoke development 25, in accordance with ASTM E84.
1. Sizes: As indicated on drawings.
D. Plywood: AC-AWPA exterior quality where exposed to moisture, fire-retardant where required, Douglas Fir faces, solid faces each side, clearly identified with grade marks.
1. Maximum moisture content: 15%.
E. Plywood Backing Panels for Mounting Electrical or Telephone Equipment: Fire-retardant treated plywood panels, APA C-D PLUGGED INT with exterior glue, 15/32" minimum thickness.
F. Nails, Spikes and Staples: Steel; size and type to suit application.
1. Hot-dipped galvanized finish for exterior location, high humidity locations and treated wood.
2. Use stainless steel or brass to mount wall-hung items on treated wood blocking.
3. Plain finish for other interior locations.
4. Electrogalvanizing is not acceptable.
B. Bolts, Nuts, Washers, Lags and Screws: Steel; size and type to suit application.
1. Galvanized finish for exterior locations, high humidity locations, and treated wood.
2. Use stainless steel or brass to mount wall-hung items on treated wood blocking.
3. Plain finish for other interior locations.
4. Electrogalvanizing is not acceptable.
C. Fasteners:
1. General: Use stainless steel for all attachments to treated wood.
2. Toggle Bolts Type: For anchorage to hollow masonry.
3. Expansion Shield and Lag Bolt Type: For anchorage to solid masonry or concrete.
4. Bolts or Power Activated Type: For anchorage to steel.
D. Building Paper: ASTM D226, Type 1; asphalt saturated, non-perforated, 15-lb type.
PART 3 - EXECUTION
04 INSTALLATION
A. Discard material with defects which might impair quality of work and too small to use in fabricating work with minimum joints.
B. Set work to required levels and lines, with members plumb and true to line and cut and fitted.
C. Securely attach carpentry work to substrate by anchoring and fastening and as required by recognized standards.
D. Countersink nail heads on exposed carpentry work and fill holes.
E. Use common wire nails, except as otherwise indicated. Use finishing nails for finish work. Select fasteners of size that will not penetrate members where opposite side will be exposed to view or will receive finish materials. Make tight connections between members. Install fasteners without splitting of wood; predrill as required.
F. Place miscellaneous blocking, furring and roof cants true to lines and levels. Secure rigidly in place.
G. Locations of Use for Decay and Insect Resistant Lumber:
1. Where not required to be fire-retardant, use pressure-treated decay and insect resistant lumber for blockings and nailing strips in contact with concrete, roofing and steel. Do not let this type of lumber make contact with items containing oil-based preservatives.
2. Apply two drenching coats of specified preservative to job-cut edges of lumber.
H. Locations of Use for Fire-Retardant Lumber:
1. Use pressure-treated fire-retardant lumber for all framing, blocking and nailing strips on interior of building.
2. Apply two drenching coats of specified preservative to job-cut edges of lumber.
I. Locations of Use for Fire-Retardant Plywood:
1. Use fire-retardant plywood where plywood is called for on drawings and fire-retardant construction is required by code. Do not use in locations such as roofing related installations where exposed to high temperature could cause deterioration of the plywood.
2. Use for panels for mounting electrical and telephone equipment; thickness as required.
J. Wood Blocking to Steel Members:
1. Secure wood blocking to steel members at 24 inches o.c. with machine bolts, washers, lock washers and nuts, unless otherwise indicated.
2. Bore and counterbore wood members to keep surfaces free of projections.
3. When steel members are not drilled in shop, drill the holes at 24 inches o.c., unless otherwise indicated.
B. Wood Blocking for Roofing Work:
1. Install decay/insect resistant lumber. Secure in place with bolts at 24" on centers.
2. Where blocking is installed over steel members, span wood blocking across joints of steel members at least 24".
3. Install a bolt at each end of each blocking member 3" from end.
END OF SECTION
