Underlayment Question

Brad C
10/19/2017
I have put down PSU30 on my entire roof, I have read in some places that there are certain areas of your roof you want to put down 2 layers of underlayment, such as valleys, or the ridge. Is that required? Best practice? Thanks.
Info @windowsonwashington.net
An informed customer is our best customer.
10/20/2017
Not really required with a properly done metal roof whereas it might have some benefit with an asphalt based roof. Ice/water in the valleys is always a good idea.

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