Preparing a deck for wood shake roofing starts with having a sturdy, well-supported base. The deck needs to be solid sheathing, typically exterior-grade plywood or oriented strand board (OSB), free of any soft spots or rot. The sheathing should be securely fastened to the roof framing with roofing nails or screws that won't back out over time. Flatness is key because wood shakes require an even surface for proper installation; any bumps or dips can cause leaks or uneven wear. Use a straightedge to check the deck’s flatness, and make any necessary repairs or sanding to smooth out high spots. It’s important to make sure the deck is dry and clean before starting, as moisture trapped under shakes can lead to premature wood decay. Proper ventilation underneath the roof deck also helps keep the shakes dry, so check that vents are clear and adequate.
You can perform some safe DIY checks before calling in a pro by inspecting the deck for any soft or spongy areas by lightly pressing with your hand or a screwdriver—soft spots mean the wood needs replacement. Look for any loose or missing fasteners, which can make the surface unstable. If the deck is new or being replaced, confirm the thickness meets local building codes, usually a minimum of 7/16-inch plywood. When you bring in a roofing contractor, ask if the sheathing material is suitable for wood shakes and how they plan to ensure the deck’s flatness before installation. Also, inquire about the type and spacing of fasteners they recommend, as improper fastening can void warranties and compromise the shake’s longevity. Ensuring these details upfront helps protect your investment and keeps your roof performing well for years.