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Is felt underlayment really needed and what is it’s purpose?

April 26, 2017felt needed purpose underlayment

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Is felt underlayment really needed and what is it’s purpose?

1 Answer

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Posted

Yes. Underlayment provides a vapor barrier between the roof deck and the shingles, and is a secondary waterproofing element of the roof, and prevents the wood deck from leaching oils from the asphalt shingles.