1x4 covered by plywood to ...: "Having metal roof over shingles...1x4 are laid..would plywood help eliminate ..." - Guest User (8/22/2006) | Installation Process | Archive

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Having metal roof over shingles...1x4 are laid..would plywood help eliminate excessive gas-canning( as roof is quite wavy)? Thank-you		Guest User 8/22/2006	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/8524/find/
Depends on style and gage of product. In the lighter low profile it will help a little but not in the heavier gages.		Allan Reid Dura-Loc Roofing Systems, Inc. 8/23/2006	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/8525/find/

1x4 covered by plywood to cut down on rippling