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Hello, my house's metal roof was installed on purlins with no underlayment. Recent condensation problems in winter led to the contractor foaming (closed cell) in the attic area over the exposed roof area. Leaks continue because all of the area was not accessible for foaming due to eaves and cathedral ceiling. If I have to have the roof removed and an underlayment installed, how are they going to get the roof off with the foam 'glued' to the metal and rafters? Thanks so much! Lee
Foamed roof
10/4/2023
Or copy this URL: https://www.metalroofing.com/spirit/comment/26372/find/Thanks Lee. What was done was something I generally advise against doing. (Installing metal roofing without solid decking and then also spray foaming direct to the back of the metal panels.) You will likely destroy the foam and the metal in removing the metal. It will require brute force and perhaps some strategic cutting. That said, underlayment alone will not fix this problem. This problem requires ventilation or closed cell foam. If you remove the roofing and install underlayment, the condensation will occur on the bottom side of the underlayment now. (And chances are some moisture will get around the underlayment and still condense on the metal.)
Isaiah Industries, Inc.
10/4/2023
Or copy this URL: https://www.metalroofing.com/spirit/comment/26373/find/