With reference to your letter of September 22, 1981 regarding the installation of cedar roof shakes.
Your questions relate to the use of sawn shakes. A sample submitted was sawn on both faces and could in this respect be equated with a shingle. The grain would indicate an item presumably with advantages over a shingle.
In essence it would seem that you wish to install the product using the higher exposure permitted for a shake instead of that for a shingle, but without the interleaving protection required by the Code for a shake.
The Board would accept the elimination of interleaving for this product subject to installation in accordance with the Code requirements for shingles. Table 9.27.9.A. would then require a maximum exposure of 71/2 inches, not the 10 inches allowed in Table 9.27.10.A. for shakes. If installed as a shake, it should comply with the Code requirements for such installation, including interleaving.
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