What is Underlayment and Do I need It?

What is Underlayment? Underlayment is a water proofing layer of felt.  It is installed between the plywood and the shingles. It is considered the waterproofing barrier that keeps the moisture from penetrating the layer of shingles and rotting the roof deck. Do I need it? Yes. If any water gets under the shingles due to…
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June 20, 2018 0