Exterior plywood is similar to any other plywood. The sizes and thicknesses are much the same; however, exterior plywood is different in a few ways. It is manufactured to withstand the weather--the glue component is waterproof--and it usually has one rough side and one smooth side, unless otherwise specified. Finally, exterior plywood must be installed differently; it requires larger screws or nails that are weather resistant. If you are planning an exterior plywood project, then you should know about the materials and techniques available to complete your project successfully.
Choosing the Plywood
Exterior plywood--treated or untreated--must be no less than one-half inch thick for applications that will leave the plywood exposed. Anything thinner will curl and warp in harsh weather environments. Exterior plywood comes in two grades: C grade has fewer splits and patches and can be used as a decorative covering, and D grade has more plugs and splits and should be used on areas that will not be seen or exposed. Treated plywood will endure almost all outdoor conditions; however, you might want to seal the plywood if it will be exposed to eight hours of sunlight or driving rain.
Installing and Protecting
Install your exterior plywood to a solid surface. Framing should be without rot and securely fastened. If these conditions are not met, then replace old rotted framing, and secure any loose boards with 3" wood screws. Use wood screws rather than nails to secure the plywood. Screws require much less force to attach, and they will provide stronger attachment. Space screws or nails 16 inches apart--across and up and down--and use galvanized or stainless steel screws or nails.
Install treated plywood in situations where you do not intend to finish the plywood by painting or staining. For all other applications--except where the plywood will not be exposed to the elements but will remain outdoors--paint or stain the plywood after installation. Use exterior plywood to cover outbuildings, houses, roof decking or carport ceilings. Use your discretion when installing exterior plywood as to whether you should paint or stain--or whether you should use treated plywood.
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