Shakes Application

Decking for cedar shakes may be spaced or solid sheathing. Spaced sheathing shall be 1" by 6" or minimum 1" by 4" nominal dimensions and shall be spaced on centers equal to the weather exposure of the applied shakes. The voids between sheathing should not exceed 5". Solid sheathing shall be minimum ½" thick. Solid sheathing may be required in areas with severe wind, wind driven snow, or seismic regions.

Roof pitch shall be a minimum 4:12 (1-in-3) slope. Refer to low slope application requirements if roof pitches are lower.

Underlayments are not required in temperate climates. In areas subject to wind driven snow or ice buildup a layer of Type 30 felt shall be laid up the roof from the eave line to a point 36 inches inside the interior of the building.

Interlayment shall be 18" wide Type 30 roofing felt laid at twice the weather exposure from the shake butts. For example, a 24" shake laid at 10" exposure shall have the bottom edge of tile felt placed 20" above the butt.

Fasteners shall be corrosion resistant such as hot dipped galvanized or stainless steel. Fasteners must penetrate into tile sheathing ¾" or through the sheathing, whichever is less. Each shake is fastened with two fasteners positioned approximately ¾" from each edge and approximately 1½" above the exposure line.

Starter course shall be one or two layers of shingles or shakes extending beyond the fascia board approximately 1½".

Apply shakes approximately 3/8" apart. The joints between shakes should be offset a minimum 1½" between adjacent courses.