Keyways/Joints Between Shakes & Shingles

What is the joint or keyway spacing between cedar shakes and shingles?

Please refer to the CSSB's New Roof Construction Manual and Exterior and Interior Wall Manual for specific details.

I have a buckling effect happening with my sidewall product. What went wrong?

Your project is experiencing what is called "fishmouthing". The bowing or curving of the shingles is due to inadequate joint or keyway spacing. When the shingles naturally expand and contract with moisture content due to weather conditions, proper joint or keyway spacing provides the room that allows them to remain flat. Contact your Member Contractor/Installer for more assistance.