Wood shakes are fastened to wood decks with 2 nails per shake. Install the nails 19 mm (3/4 in) from each edge and 38 mm (1 1/2 in) above the exposure. The starter course is applied with an overhang of the roof deck of 38 mm (1 1/2 in). Apply the shakes across the eave, then install the first layer of interply 250 mm (10 in) above the butt. The second course is then applied directly over the starter, ensuring that the joints are offset a minimum 38 mm (1 1/2 in). Install another layer of interply 508 mm (20 in) above the butts.
Shingles and shakes should be used straight out of the bundle. Try not to pick and choose. Otherwise you may end up with a lot of pieces the same size which will give a spotted appearance to the roof area.
When installing shakes, they should be spaced approximately 6.4 mm (1/4 in) apart to allow for any swelling that may occur. Install the remaining courses using the felt which is visible between joints as a guide for exposure. Continue applying rows in this manner, ensuring that the joints are staggered and that, in any 3 courses of shakes, no 2 joints are in line. Shakes with rough cut butts must always be applied with the shortest side set to the desired exposure.