
Example of how to calculate net free area:
1200 square foot attic divided by 150 square feet = 8 square feet (1200 / 150 = 8)
8 square feet times 144 square inches = 1152 square inches (8 x 144 = 1152)
1152 square inches divided by 2 = 576 square inches at soffit and at exhaust (1152 / 2 = 576)
The wood structural panels shall conform to DOC PS 1, DOC PS 2, CSA 0437 or SCA 0325, and shall be identified for grade, bond classification and performance category by a grade mark. The surface to which roofing is applied. Decking is installed over supporting roof framing members.