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Roof Underlayment – 30 Perms

jackofalltrades777 | Posted in General Questions on

I find this synthetic underlayment that is rated at 30 Perms. It’s called Hydra.
https://ftsyn.com/hydra-breatheable-underlay/

It looks like it would work good with SIPS roofs. Of course, your roofing material matters. Using an elevated metal roof that sits on metal purlins that puts a 1.50″ – 2.00″ space between the decking the metal roof.

Anyone have any experience with Hydra roof membranes?

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