The type of plywood for roofing is typically exterior-grade plywood that is at least 1/2 inch thick for standard roof decking. Roofs need strong, weather-resistant plywood to handle rain, wind, and the weight of shingles or other materials. Most roofers use CDX plywood, which is exterior grade and has one good side. The plywood must be rated for outdoor use and able to support the roof system you choose. Proper plywood is key to a roof that lasts many years.
What Makes Roofing Plywood Special?
Roofing plywood is different from regular indoor plywood. It must resist water and weather damage. Exterior-grade plywood has a waterproof adhesive that holds the layers together. This keeps the wood from breaking apart when it gets wet.
CDX plywood is the most common choice for roof decking. It costs less than other types and works well for most homes. The “X” means it has exterior-grade glue. The “D” side can have knots and flaws, but the other side is better quality.
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Which Plywood Thickness Do You Need?
Most homes use 1/2 inch or 5/8 inch thick plywood for roofing. The thickness depends on how far apart your roof trusses are spaced. If trusses are 16 inches apart, use 1/2 inch plywood. If they are 24 inches apart, use 5/8 inch plywood. Thicker plywood is stronger but costs more.
Thicker plywood also provides better protection for your home. It handles heavy snow loads better in cold climates. It resists denting when workers walk on it during installation.
Popular Roofing Plywood Options
Here are the best plywood choices for roofing:
| Plywood Type | Best Use | Cost Level |
|---|---|---|
| CDX Exterior | Standard residential roofs | Low |
| BC Exterior | Premium homes, better appearance | Medium |
| Tongue and Groove | Vaulted ceilings, exposed beams | High |
| Structural Plywood | Heavy snow areas, high wind zones | Medium-High |
How Roof Replacement Costs Add Up
According to RubyHome, roof installation costs range from $4 to $40 per square foot. For a 1,700 square foot roof, total costs run between $6,800 and $68,000. Plywood is just one part of the total expense.
According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet. The average roof replacement cost is around $25,840. Good plywood helps protect your investment by lasting many years. According to RubyHome, roofs last between 25 and 50 years on average, and proper materials help reach the upper end of that range.
Choosing quality exterior-grade plywood at 1/2 to 5/8 inch thickness is a smart investment. It supports your shingles properly and protects your home from water damage for decades. Always use plywood rated for exterior use and weather resistance.
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Work with a professional roofing solutions to protect your property with quality roofing solutions.