Shake 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.

Application Instructions for Cedar Shakes

INSTRUCTIONS FOR APPLYING CEDAR PLUS CEDAR
SHAKES AS A CLASS ROOF COVERING SYSTEM

Cedar Plus Class "B" labeled cedar shakes must be applied over one layer of 1/4" thick Dens-Deck Roof Board manufactured by Georgia Pacific Corporation or with one layer of 72-pound mineral surfaced cap sheet. Fastener length must be increased for the thickness for the Dens Deck board or the cap sheet.Dens-Deck boards are fastened to spaced or solid sheathing using a minimum of

four fasteners to avoid panel shifting prior to the installation of the shakes. If installed on spaced sheathing the horizontal joints of the Dens-Deck must meet on the solid nailing surface. The mineral-surfaced cap sheet is installed mineral surface side up with 2" (51 mm) overlaps on sides and ends, and attached with suffi-cient number of fasteners to hold the sheet in place prior to installation of the shakes. If installed on spaced sheathing the horizontal overlap must meet on the solid nailing surface. (See figure A). Figure A

Roof Pitch and Exposure
Handsplit shakes should be used on roofs where the slope or pitch is sufficient to insure good drainage. Minimum recommended pitch is I/6th or 4-in-12 (4" vertical rise for each 12" horizontal run). Maximum recommended weather exposure is 10" for 24" shakes.

Roof Application
Along the eave line, a 36" wide strip of Type 30 roofing felt is laid over the sheathing. The beginning or starter course at the eave line should be doubled. After each course of shakes is applied, an 18" wide strip of Type 30 roofing felt is laid over the top portion of the shakes extending onto the sheathing, with the bottom edge of the felt positioned at a distance above the butt equal to twice the weather exposure.

Fasteners
Hot dipped zinc coated nails or stainless steel staples are recommended. However, any U.B.C. approved corrosion resistant fasteners can be used, Use two for each shake placing them approximately 1" from each edge, and high enough to be covered an " or two by the succeeding course. Fasteners should be long enough to penetrate at least 3/4" or through the sheathing. The butts of the shakes should project from 1 1/2" to 2" from the first roof board so that the rainwater will spill into the gutter or to the ground without working down the side of the building. Individual shakes should be spaced about 1/4" to 3/4" apart to allow for possible expansion. These joints or spaces between shakes should be broken or offset at least 1 I/2" in adjacent courses and should be kept out of direct alignment in alternate courses.

WARNING: Both raw and fire retardant treated cedar products contain a level of tannic acid that metals and concrete surfaces. Pre-painted galvanized or pre-painted aluminum gutters are recommended. Initial water run-off over both raw and fire retardant cedar can cause staining. A low pressure wash of the roof immediately after application recommended. Chemco is not responsible for any direct or indirect damages caused by water run-off.

Class "C" labeled red cedar shakes may be applied over open spaced or solid sheathing.

Roof Pitch and Exposure
Handsplit shakes should be used on roofs where the slope or pitch is sufficient to insure good drainage. Minimum recommended pitch is 1/6th or 4 -in-I 2 (4" vertical rise for each 12" horizontal run. Maximum recommended weather exposure is 10" for 24" shakes.

Roof Application
Along the eave line, a 36" wide strip of Type 30 roofing felt is laid over the sheathing. The beginning or starter course at the eave line should be doubled. After each course of shakes is applied, an 18" wide strip of Type 30 roofing felt is laid aver the top portion of the shakes extending onto the sheathing, with the bottom edge of the felt positioned at a distance above the butt equal to twice the weather exposure.

Fasteners
Hot dipped zinc coated nails or stainless steel staples are recommended. However, any U.B.C. approved corrosion-resistant fasteners can be used. Use two for each shake placing them approximately one " from each edge, and high enough to be covered an " or two by the succeeding course. Fasteners should be long enough to penetrate at least %" or through the sheathing. The butts of the shakes should project from 1 to 2 inches from the first roof board so that the rainwater will spill into the gutter or to the ground without working down the side of the building. Individual shakes should be spaced about ¼" to 3/8" apart to allow for possible expansion. These joints or spaces between shakes should be broken or offset at least1 ½" in adjacent courses and should be kept out of direct alignment in alternate courses.
Valleys, Hips and Ridges
The roof valley flashing shall be provided of not less than No. 28 gauge pre-painted baked enamel metal applied over an underlayment of not less than Type 1 5 felt. The metal shall extend at least i 1 inches from the center line each way. Hips and ridges can be site-fabricated, or factory-formed hip and ridge units can be used. Weather exposure should be the same as that used in applying shakes in the field of the roof, and nails should be of sufficient length (usually 8d) to firmly attach the hip and ridge shakes to the underlying sheathing. Flashing and counter-flashing should be applied as illustrated.

INSTRUCTIONS FOR APPLYING CEDAR PLUS CEDAR SHAKES AS A CLASS "B" ROOF COVERINGS

Cedar Plus Class "B" labeled cedar shakes may be applied as a Class "B" roof covering in the same manner as a Class "C" roof covering except that a solid deck of 1/2' minimum plywood or equivalent must be used under the shakes.

WARNING: Both raw and fire retardant treated Cedar products contain a level of tannic acid that can cause corrosion to unprotected[ metals and Concrete surfaces. Pre-painted galvanized or pre-painted aluminum gutters are recommended. Initial water run-off over both raw and fire retardant cedar can cause staining. A low pressure wash of the roof immediately after application recommended. Chemco is not responsible for any direct or indirect damages caused by water runoff.