Direct Application of Shakes and Shingles

According to Chris Hunt and his co-authors on Installation, Care, and Maintenance of Wood Shake and Shingle Siding, shakes or shingles can be applied directly over properly installed and flashed Type 30 felt (or house  wrap as approved by local codes). Shakes and shingles may be single-coursed,

stagger-course

Single-coursed application of shingles. Used with permission from Cedar Shake and Shingle Bureau Exterior and Interior Wall Manual.

stagger-coursed,

Stagger-course

Stagger-course application. Used with permission from
Cedar Shake and Shingle Bureau Exterior and Interior Wall Manual.

or double-coursed.

Double-course

Double-course application. Used with permission from
Cedar Shake and Shingle Bureau Exterior and Interior Wall Manual.

The double-course application permits the use of a lower grade for the first layer and a  greater exposure of the higher quality second layer of shake  or shingle. Pressure-impregnated preservative-treated products can be used in these applications.

So the homeowner who wants the beauty and natural look of cedar siding can use these techniques to cover existing siding.