Double layer of tar paper. | Ask The Experts Forum

Guest User 10/1/2004	Starting with a completely stripped roof, right down to the shiplap. Can anyone see a problem with laying down a layer of 30# ASTM tar paper on the shiplap, adding a layer of 0.5" CDX plywood, then another layer of 30# ASTM tar paper? The issue is the extra tar paper near the house. Thank you!	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/4187/find/
Allan Reid Dura-Loc Roofing Systems, Inc. 10/4/2004	I have no idea what you are trying to accomplish with the second layer. Underlayment is designed as a moisture barrier. That is to catch any condensation under the roof covering and to act as a secondary protection. Instalation in this manner could under certain circumstances trap moisture and cause rot.I would not recommend it.	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/4188/find/

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