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On a roof assembly, it OK to apply thin layer of breathable insulation directly on top of OSB decking and under felt and shingles?

by LiveModern Webmaster last modified Feb 05, 2015 01:00 AM
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by last modified Feb 04, 2015

My contractor recommends applying a 1/2" thick foil-backed rolled insulation on top of the existing OSB decking as a means of insulating and optimizing the life of the roof. He will then lay 43lb felt and nail asphalt shingles (at least 6 mm thick) directly to this assembly. We are in the Chicago area. I am concerned because this is a little different from the typical installation of a shingled roof and one of the shingle manufacterers has a very limited list of allowable applications. He insists that the insulation will be breathable, so is there any harm in it what he is proposing? Thank you so much for your help.




 

 

My contractor recommends applying a 1/2" thick foil-backed rolled insulation on top of the existing OSB decking as a means of insulating and optimizing the life of the roof. He will then lay 43lb felt and nail asphalt shingles (at least 6 mm thick) directly to this assembly. We are in the Chicago area. I am concerned because this is a little different from the typical installation of a shingled roof and one of the shingle manufacterers has a very limited list of allowable applications. He insists that the insulation will be breathable, so is there any harm in it what he is proposing? Thank you so much for your help.

If the proposed product is either an open-cell foam or a foil-face fiberglass, I do not recommend installing it in the application you describe. These products trap air and in...


 

 

 
 
 

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