The Best Plywood for Roofing: 1 Minute to Choose the Right Type of Plywood for Your RoofSarah ThompsonSep 09, 2025Table of ContentsTips 1:FAQTable of ContentsTips 1FAQFree Smart Home PlannerAI-Powered smart home design software 2025Home Design for FreeWhen choosing the best plywood for roofing, the top priorities are durability, strength, and moisture resistance. Typically, roof sheathing relies on two main types: CDX plywood and OSB (Oriented Strand Board). Among these, CDX plywood stands out because it is made with exterior-grade glue and has a layered structure that withstands exposure to the elements better than most alternatives. It comes in thicknesses usually ranging from 3/8" to 3/4", with 1/2" and 5/8" being industry standards for residential roofs. Plywood used for roofing should also be graded for exposure (often labeled as "Exterior" or "Exposure 1"), ensuring it performs well under temporary weather exposure during installation. Proper installation—such as leaving gaps for expansion—further improves longevity.Tips 1:As a designer, I always recommend considering not just the structural aspect but also the visual finish for projects involving exposed rafters or eaves. Selecting a high-quality, smooth-faced plywood for roofing can enhance both the function and aesthetic of your space, especially when planning for visible ceiling designs or seamless transitions to indoor living areas.FAQQ: What is the most common thickness of plywood for roofing?A: The most common thickness is 1/2" or 5/8". Thicker sheets may be used for increased durability on larger spans.Q: Should I use CDX plywood or OSB for my roof?A: CDX plywood is generally preferred for roofs due to its moisture resistance and overall strength, though OSB is also widely used for cost-effective projects.Q: Does roofing plywood need to be treated against moisture?A: Yes, ensure the plywood is graded "Exterior" or "Exposure 1" to guarantee moisture resilience during installation and ongoing protection.Q: Can plywood be used for flat roofs?A: Plywood can be used for flat roofs, but additional waterproofing and structural support are necessary for long-term performance.Q: What grade of plywood is suitable for roofing?A: Grades such as CDX or those marked with "Exposure 1" or "Exterior" are ideal for roofing, as they are designed to resist moisture and warping.Home Design for FreePlease check with customer service before testing new feature.