We recently installed a Zip System roof over roof trusses spaced 24 inches on-center. The lumberyard told us to install H-clips as for conventional sheathing, but after taping over all the seams between panels, we found that water leaked through the tape at almost every clip. Later I heard that the H-clips weren’t needed in the first place. Are they required? And if they are, how do you prevent leaks?

A.Chris Clark, product application engineer at Huber Engineered Woods (maker of Zip System roof and wall sheathing), responds: You don’t mention what thickness Zip System sheathing you used, but the requirement for H-clips is dictated by code. Under the IBC, 1/2-inch PS-2 panels with a span rating of 32/16 can have an unsupported edge of up to...

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