06300.pdf

112-005 06300-1

SECTION 06300 1

WOOD TREATMENT 2

A. GENERAL 4

RELATED WORK SPECIFIED ELSEWHERE 6

Installation of Treated Rough Carpentry Materials Section 06100 8

ACCEPTABLE MANUFACTURERS 10

Acceptable manufacturers are those listed by the American Wood Preservers Bureau in their current directory as 12 suppliers of pressure-treated wood products. 13

QUALITY MARK 15

Each piece of lumber which is pressure treated shall bear the American Wood Preservers Bureau Quality Mark to 17 indicate conformance with the AWPB Standard specified later in this section. The information required by the 18 American Wood Preservers Bureau Standard must appear on the label. 19

DELIVERY, STORAGE AND HANDLING 21

Store pressure-treated lumber indoors, if possible, or on a raised platform under waterproof coverings. 23

CONTRACTOR'S OPTION 25

The Contractor may substitute untreated Grade No. 2 or better Western Red Cedar in lieu of pressure-treated 27 framing and blocking material at all locations where decay-resistant material is specified hereinafter. In the case of 28 all blocking nominally 8" wide or wider, only Western Red Cedar shall be used; pressure-treated wood will not be 29 acceptable. 30

B. PRODUCTS 32

PRESERVATIVE TREATMENT 34

All preservative treatment shall comply with applicable requirements of AWPA Standards C2 (Lumber) and C9 36 (Plywood) and of AWPB Standards listed below. Mark each treated item with the AWPB Quality Mark 37 Requirement. 38 Preservative-treat items listed below with water-borne preservatives complying with AWPB LP-2 to a minimum 40 retention of 0.25 pcf. After treatment, kiln-dry to a maximum moisture content of 19%. 41

LUMBER REQUIRING PRESERVATIVE TREATMENT 43

Rough carpentry materials for decay resistant pressure treatment shall consist of the following materials: 45

1. All miscellaneous blocking, cants and similar items at roof edge nailers, parapet caps, roof curbs , 46 windows, doors, and similar items (except cedar used under the Contractor's options described above.) 47

2. All blocking in contact with masonry or concrete. 48

FIRE RETARDANT TREATMENT 50

All fire retardant treatment shall comply with applicable requirements of AWPA Standards C20 (Lumber) and C27 52 (Plywood) and of AWPB Standards listed below. Mark each treated item with the AWPB Quality Mark 53 Requirement. 54 Fire retardant-treat items listed below with water-borne preservative to achieve flame spread of 25 or less when 55 tested under ASTM E 84, NFPA 255 or UL 723. After treatment, kiln-dry to a maximum moisture content of 19%. 56

112-005 06300-2

LUMBER REQUIRING FIRE RETARDANT TREATMENT 2

Rough carpentry materials for fire retardant resistant pressure treatment shall consist of the following materials: 4

1. Plywood mounting boards for electrical, telephone and communication equipment. 5

2. Wood framing and blocking above ceilings and soffits, except where such blocking is separated from 6 above ceiling spaces by a fire-rated gypsum board system. 7

ON-SITE TREATMENT 9

Cuts resulting from site fabrication shall be liberally coated with a concentrated solution of the preservative. 11

C. EXECUTION 13

INSTALLATION 15

Installation of treated wood shall be as specified in Section 06100, Rough Carpentry. 17