When choosing what plywood to use for roofing, there are a few key considerations to consider. The typical roof has rafters spaced approximately twenty inches apart, which means the plywood must be between 5/16 and 3/8 inches thick. While 3/8-inch-thick sheets are sufficient, a heavier-load roof may require a thicker product. Also, note that the thickness of the roofing plywood sheet is largely dependent on the type of roof and the design. For example, a flat roof is expected to carry a heavier load than a steeper roof. commercial roofing
There are two types of plywood: structural and general. The former is stronger and passed building regulations. The latter is cheaper but isn’t as good. General plywood is suitable for the underside of the roofing sheet but may not be as durable as structural plywood. Shuttering plywood is used to support the concrete while it sets. There are other considerations as well, such as the amount of weight that the roof must bear. A good way to determine what plywood to use for roofing is to estimate how many square feet of the roofing will require.
Another consideration when choosing the plywood for a roofing project is the thickness of the sheathing. While 3/8-inch CDX plywood is fine to be used for roofing projects, a thicker sheet will reduce the life of the tar paper and shingles. If you mix different plywood types, you must replace the whole sheet if you see any damage. This will result in a ridge on the roof. If you’re unsure about what plywood to use for roofing, you can ask a contractor.
Another consideration when choosing a plywood roofing product is the size of the roof. The standard 4×8 sheet will cover approximately 32 square feet, so you can estimate how many sheets you’ll need to cover the roof. You can always get larger sheets from specialty retailers. Purchasing larger panels will also help minimize the number of edges on your roof. If you have a conventional gable roof, you should select one with identical slopes.
As mentioned, there are different types of plywood, such as OSB, and you’ll want to choose the best one for your home. The thickness will depend on the distance between the rafters and the weight of the roof. You’ll want to calculate the weight and size of your rafters and the roof loads. Then, choose a thickness that fits these factors. This will ensure the maximum protection for your roof.
One benefit of plywood over OSB is its resistance to moisture. While both types of plywood swell when wet, they will quickly return to their normal size. Plywood dries out more quickly and won’t delaminate if it rains or snows. This property makes it a popular choice in roofing projects. However, be aware that not all plywood is created equal. For roofing, choose a 5-ply plywood sheet.