We are considering replacing our wood shake roof with Cedarlite. Is it required to cover the existing skip sheeting with solid sheeting? Why can Cedarlite be applied to skip sheeting?
The Cedarlite tile, despite its similar appearance to wood shake, is a completely different type of product that cannot be installed in the same manner as shakes. Wood shakes are double-lapped products that are 24-inches long with only 10-inches exposed. The Cedarlite is a 13.5-inch long tile with only a 3-inch headlap. Consequently, our building codes require that an underlayment be applied beneath the tiles. There is a provision that would allow the tiles to be installed over spaced sheathing but that method requires a very specific application and special type of underlayment that is not readily available in this country. While this method may be used, most contractors are not familiar with this application and many feel that it is more economical to sheath the roof and install the tiles in the more traditional method used in this country. The other issue is that many municipalities do not allow the spaced sheathing method of application.
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