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Roofing/roofing underlay and ventilation


Sal wrote at 2013-02-22 17:25:11
I will add my experience to this.

First, the Rhino product is a shingle only product, per the MFG. If you are using anything else, look to another synthetic that is a #30 replacment or better type.

Regarding synthetic Breathable underlayments, these types of underlayments should never be used with a shingle type cladding. there must be a "space" between the cladding and the underlayment for air circulation.  Essentially, the use of shingle products directly on top of a synthetic breathable is counterproductive.  You are putting a Class 1 vapor retarder on  top of the breathable product.  The life span on your fasteners and shingle will be exponentially reduced.


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Brad Zacharia


All aspects of residential Roofing. This includes shingles and flat (low slope) roofs. I have knowledge in the installation as well as the design of roofs from an engineering standpoint.


I have been doing roofing for 40 years. This was my father's business and I took it over in 1980.

I have written responses to artcles that I felt needed a response to and those responses have been published in roofing trade magazines.

BSEE Drexel University

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