Roof Rating Of 2 Or 3

If the roof deck is combustible such as wood plywood or osb two additional tests must be conducted.

Roof rating of 2 or 3.

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For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. And it weighs about the same as asphalt so there s no need to beef up the. Become a member or sign in. This composite material looks like the real thing even close up but costs a lot less.

The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. Both are burn through tests and the ultimate roof systems rating is the lowest of the three tests. Their laminated architectural shingle is a bit smaller at 32 8 square foot and run at the slightly higher cost of 25 or so per unit.