Do I need to use roofing felt?

Old 08-04-02, 04:22 PM
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Question Do I need to use roofing felt?

I am building a garage and have a roofing question.
I have heard that you can roof with aspalt shingles with no roof felt under them and I have heard that you must use roofing felt.
Which of these are true??
Thanks for any help!
Old 08-04-02, 04:34 PM
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Roofing felt

"I did some repairs to my roof and noticed there is no roofing felt under them. Is this the correct way to install shingles?

No, it is not. Unless it's an overlay (recover), there should be felt underlayment separating the roofing materials and the deck. Many home builders install roofs this way so that they can save money. It is frowned upon by the National Roofing Contractor's Association, the Asphalt Roofing Manufacturer's Assocation, and any roofer with integrity.

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

If you want some installation instructions proving that it's required, visit the following pages of three popular material manufacturers. You need Adobe Acrobat Viewer to view the files.

FREQUENTY ASKED QUESTIONS. Roof Help. Retrieved 04 August 2002.

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