Measuring roof decking materials

[sfetty (Dave Fetty, CMI)]

@lhenderson2

@tsayre3

doesn’t the roof deck require spacing between the sheets

No. One obvious reason is that if you are spacing 1/8" on the ends that you center on a 1 1/2" wide edge of a truss, you are off the edge of the truss after 6 sheets.

Most modern roof sheathing manufacturers do require spacing and sheets are sized for spacing.

In my area T&G is rearely (I’ve never seen it) used for roof sheathing, very commonly used for floor sheathing. Roof sheathing thickness requirements in Florida changed in the 2020 FBC and according to the 2026 FBC DRAFT will continue. There are other threads about this topic too:

New since 2020 FBC Residential Roof Sheathing and Sheathing Fastener Requirements

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Florida Inspectors, New (since 2020 FBC) requirements for roof sheathing

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