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Frequently Asked Questions

a. What is the difference between a shake and a shingle?

Generally, a shingle is sawn on both sides and is thinner at the butt than a shake. A shake is typically split on one or both sides. There are important exceptions to this, (tapersawn shakes = shakes sawn on both sides) depending on the specific manufacturing method and the dimensions of a specific product. Shakes are still manufactured by hand, but most are now made using powered equipment. Shakes are made by taking the wood straight split from the block, and sawing it end-to-end at an angle. This creates a shake which is sawn on one side and split on the other, often called a "handsplit and resawn" product. Medium shakes are shakes that measure nominal 1/2" at the butt. Heavy Shakes are shakes that measure nominal 3/4" at the butt.

b. How are shingles manufactured?

Shingles are always sawn on both sides from a block of cedar. Most shingles are manufactured using a stationary, upright saw. The block of cedar is moved through the path of the saw by a device called a carriage, which holds the wood firmly, but also alternates the angle of the cut with each stroke. After being cut from the block, the sides of each shingle are then trimmed to create square corners on the product. The material, manufactured by skilled tradesmen, is then inspected and bundled with a label, and shipped for roof installation, or for additional processing to create more tailored sidewall products.

c. What is the difference between a number one grade shake and a premium grade shake?

The difference between the two is only the flat grain content. Premium grade shake bundles contain no flat grain shakes. Number one grade shakes contain up to 20% flat grain per bundle.

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 1ò2" 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 3ò4" or through the sheathing, whichever is less. Each shake is fastened with two fasteners positioned approximately 3ò4" from each edge and approximately 11ò2" above the exposure line.

Starter course shall be one or two layers of shingles or shakes extending beyond the fascia board approximately 11ò2".

Apply shakes approximately 3/8" apart. The joints between shakes should be offset a minimum 11ò2" between adjacent courses.

Decking for cedar shingles may be spaced or solid sheathing. Spaced sheathing shall be minimum 1" by 4" nominal dimensions and shall be spaced on centers equal to the weather exposure of the applied shingles Solid sheathing shall be minimum 1/2" thick. Solid sheathing may be required in areas with severe wind, wind driven snow, or seismic regions.

Roof pitch shall be a 3:12 (1-in-4) slope. Shingles may be applied at a 4:12 (1-in-3) slope when shingle exposure is reduced in accordance with exposure tables,

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 tile eave line to a point 36 inches inside the interior of the building. Interlayments are not recommended.

Fasteners shall be corrosion resistant such as hot dipped galvanized or stainless steel. Fasteners must penetrate into the sheathing 3/4" or through tile sheathing, whichever is less. Each shingle is fastened with two fasteners positioned approximately 3/4" from each edge and approximately 11/2" above the exposure line.

Starter course shall be two layers of shingles extending 11/2" beyond the fascia board.

Apply shingles approximately 1/4" apart. The joints between shingles should be offset a minimum 11/2" between adjacent courses, and not in direct alignment in alternate courses.