PRODUCT DESCRIPTION

Fire-Retardant Cedar Shakes and Shingles

Steadfast No. 1 shingles and No.1 shakes are available pressure impregnated with fire-retardants and meet testing standards developed by Underwriters Laboratories and adopted by the National Fire Protection Association. May be used for Class C, B and A roof system.

.40 CCA Pressure Preservative Treated Cedar Shakes and Shingles

Steadfast shingles and shakes are warranted for 30 years by the treater and/or chemical company when .40 CCA pressure treated. This product is ideal in areas of high humidity where premature decay may occur.

GENERAL DESIGN DETAILS

Sheathing

Shingles and shakes shall be applied over spacing sheathing. Spaced sheathing is usually 1"x 4" (25.4 mm x 101.6 mm) or 1" X 6" (25.4 mm x 152.4 mm) softwood boards.

Solid sheathing is acceptable and may be required in seismic regions or under treated shakes and shingles. It is recommended on shake applications in areas where wind-driven snow is common. Solid sheathing is usually waferboard panels or plywood which provides a smooth base for roofing.

Shingles

There are two acceptable methods for application of spaced sheathing: One is to space 1"x 4" (25.4 mm x 101.6 mm) boards to coincide with the weather exposure (Table 3, Page 23) of the shingles (Figure 1). Thus, if the shingles are to be laid at 5 1/2 (139.7 mm) to the weather, the sheathing boards would also be spaced at 5 1/2" (139.7 mm) on center. In this method of application each shingle is nailed to the center of the 1" x 4" (25.4 mm x 101.6 mm) board.