Reroofing Over Zip System Sheathing

Q: I’m stripping and reroofing asphalt shingles that were installed over Huber Zip System sheathing. Can I install the new roof directly over the sheathing, or do I have to do anything else? The seams were all secured with Zip tape originally.

— MIKE, via email

A: Tate Hudson, a product application specialist with Huber Engineered Woods, replies: When installing new shingles or roofing over existing Zip System sheathing, you first need to install an additional code-approved roofing underlayment due to the amount of nail holes left behind from the previous roof covering.

More about wall and roof sheathing:

• A Practical Air-Sealing Sequence
• Video: How to Install Wall Sheathing
• Video: Sheathing a Roof

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