The kind of plywood for roofing is OSB (oriented strand board) or exterior-grade plywood rated for wet conditions. Both are used as the base layer under shingles and other roofing materials. Your choice depends on your climate, budget, and roof type. Plywood is measured in thickness, with 7/16-inch and 1/2-inch being the most common sizes for residential roofs. According to industry data, the average residential roof size is 1,600 square feet, so you will need enough sheets to cover your entire roof deck. The right plywood keeps water out and holds your shingles in place.
What Is the Difference Between Osb and Plywood?
OSB is made from wood strands pressed together with glue. Plywood is made from thin layers of wood veneer glued together. Both can work for roofs, but plywood is stronger and more water-resistant.
OSB costs less money upfront. However, plywood lasts longer in wet climates. Choose plywood if you live in a rainy area.
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What Thickness Should Roofing Plywood Be?
The standard thickness for residential roofing is 7/16-inch or 1/2-inch. Thicker plywood provides more support for heavy snow loads in cold areas. Most builders use 1/2-inch for durability.
Check your local building codes. Some areas require thicker plywood based on roof pitch and weather patterns.
How Much Plywood Do You Need?
Calculate your roof area in square feet, then divide by 32. One sheet of plywood covers 32 square feet. If your roof is 1,600 square feet, you will need about 50 sheets.
Add 10 percent extra for waste and cuts. Buy from suppliers that stock exterior-grade materials rated for roofing applications.
| Plywood Type | Cost per Sheet | Lifespan | Best For |
|---|---|---|---|
| OSB (7/16″) | $15 – $25 | 20 – 25 years | Dry climates |
| Exterior Plywood (1/2″) | $30 – $45 | 25 – 50 years | Wet climates |
| Premium Plywood (5/8″) | $50 – $70 | 30 – 50 years | Heavy snow |
Why Does Plywood Matter for Your Roof?
Plywood is the foundation of your roof. It holds shingles, blocks water, and supports the weight of rain and snow. Poor quality plywood leads to leaks and costly repairs.
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According to RubyHome, the average roof replacement cost is $9,526, with a range of $5,868 to $13,217. Using quality plywood helps your roof last longer and protects this big investment. According to industry data, most roofs last between 25 and 50 years. The right plywood choice keeps your roof strong for decades.
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Work with a professional roofing contractor to protect your property with quality roofing solutions.