H-clips - required?

[Peter G. Siposs]

Steep roof, 2 foot on center rafters. No H-clips on OSB. Are they required for new construction (in WA)?

[Jeffery L. Haynes]

Either clips or block it.

[Linda J. Foster]

There is usually stamping on the interior side that state if sheathing should allow for expansion. Most I have seen say 1/8 inch on the 8 foot side.

[James F. McKee]

how thick is the osb?

[Peter G. Siposs]

Not able to see the thickness of the OSB. Did not see or look for any notation about spacing etc.

[Peter G. Siposs]

If its thick it may not require H-clips?

[David E. Helm]

In Washington, most OSB roof decking is 7/16 and requires H clips midway between trusses/rafters if 24 inch OC spacing (and most are 24 inch)

[Chuck Evans]

I think it is generally up to the manufacturers. APA "recommends" 1/8 inch expansion gap at all edges unless mfr states otherwise. Also tongue and groove or panel clips where required.

If the are not present and I reference the APA recommendation and let the builder try to demonstrate that the mfr says it's not required.