What type of felt interlayment do you recommend for shake application?
The CSSB recommends using an 18″ wide strip of Type 30 roofing felt laid over the top portion of the shakes and extending on to the sheathing. Check with your local Building Official for exact specifications in your area. The bottom edge of the felt should be positioned above the butt of the shake at a distance equal to twice the weather exposure. Note: Building officials MAY approve eliminating felt interlayment between shake courses when tapersawn or tapersplit shakes are applied in snow-free areas at weather exposures of less than one-third the total shake length (3-ply roof). ALWAYS check with your local Building Official for project approval PRIOR to deviating from standard application guidelines.
