Roof Sheathing Question

5 years ago

I witnessed something interesting today that I thought I might ask ya'll about. A "co-worker" of mine started sheathing a roof we are framing today and started the bottom chord with a 2' rip all along the first (bottom) row. He claimed it was for easier repair in case the roof began to mold. Any credibility behind this?

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Comments (3)

PRO
GN Builders L.L.C
5 years ago
Never heard of that before. You always start with a full panel.

https://www.youtube.com/watch?v=5M0Qaokek9I
HU-867564120
5 years ago
All he is saving is a future horizontal cut with a saw set to the sheathing thickness. Big deal! I'd rather have the strength of a full sheet of sheathing. Besides, if the under-roof area is properly built, and the roofing material on top is applied correctly, there shouldn't be any mold issue.
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3onthetree
5 years ago
Give 'em points for thinking ahead and actually caring about what happens in the future, but then deduct those points for execution and forgetting about some things.

Assuming there is an eave overhang. Any potential mold will be inside the perimeter of the top plate, and it will be spread about, it does not adhere to a maximum of 24" (or say 9" of where the cut line falls to the next sheet). So 24" won't get you much past the eave. Then for roofing underlayment, an ice barrier is 36" (again covering 24" inside the perimeter top plate) and it don't come off too easy, so it would be past that 24" sheet cutline.