Synthetic Underlayment

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March 2, 2023 at 6:17 p.m.

alextolle

Audie from Texas asked:

When replacing roof that has synthetic underneath, does it need to be removed from plywood then apply new underlayment?

March 2, 2023 at 6:19 p.m.

alextolle
This is what roofing expert John Kenney from Cotney Consulting Group had to say in response to your question:
 
Building codes define this and require all existing layers of roof coverings, including synthetic underlayments, to be removed down to the roof deck during a roof replacement. Self-adhering membrane underlayments are the only exception to this rule, and they may be left in place and covered with another layer of the membrane.

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