Flat Roof Plywood Sheathing

Severe weather 1 2 in common southern yellow pine plywood sheathing application as 4 x 8.

Flat roof plywood sheathing.

As a quick primer in plywood each side is rated from a to d. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood the most popular being osb. Zip system sheathing and tape provides a water resistant durable underlayment for many finished roof coverings including metal tile and asphalt shingles fiberglass shingles and cedar shingles. For pricing and availability.

Plywood sheathing is ideal for residential and light plywood sheathing is ideal for residential and light construction. The common grade of plywood for roof sheathing is cdx. Zip system panels install fast and stay flat for a roof that looks as good as it performs. Sheets of 7 16 inch thick with no edge support can be used in an area where the snow load is 30 pounds per square foot.

The sheathing is the base you lay over the rafters that holds the roofing felt and shingles. That s considered to be the minimum. 15 32 cat ps1 09 square structural douglas fir sheathing application as 4 x 8. So dividing the area of the roof by 32 will give you the number of sheets needed.

A is smooth and knot free while d the lowest quality has missing knots and cracks. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Roof sheathing or decking is one of those elements. One side is usually better quality than the other c in this case.

With edge support and the same snow load 3 8 inch osb can be used. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Installing sheathing on a flat roof is much easier than working on a peaked roof.

It will be a good idea to get an extra few sheets of plywood when ordering to allow for waste and off cuts. Every piece meets the highest grading standards for strength and appearance. That s considered to be the minimum. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it.