I have not heard of any evidence to support your theory.
Spray foam under roof.
Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly.
The challenge comes when you combine systems spraying foam onto the metal roofing itself.
Will re roofing damage foam under the roof.
Both open cell and closed cell spray foam insulation adhears extremely well to the underside of roof decks and the rafters surrounding them when installed correctly.
This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4.
Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials.
Polyurethane spray foam metal roof insulation in order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam.
Metal roofing manufacturers typically extend a 25 year warranty.
The concern of manufacturer mbci is over who is going to verify that the foam will not cause corrosive damage over time to the roofing.
Spray polyurethane foam roofing or spray foam roofing is a material that s sprayed as a liquid so it can expand into a foam creating a solid layer across an existing roof.
No interior class i vapor retarders e g plastic sheeting are installed on the ceiling side attic floor of the.
This is a great question.
Where wood shingles or shakes.
Lstiburek takes blame for bad language.
It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer.
How spray foam should be installed on the underside of the roof decking the unvented attic space is completely within the building s thermal envelope.
Moisture generated indoors or that infiltrates into the home is responsible for the bulk of the moisture in an attic insulated with spray foam on the underside of the roof sheathing.
It s not coming from above the roof and it s not some new moisture source resulting from the spray foam.