This topic has been closed by the administrator. Comments are no longer accepted.
OK, now even more confused. When talking underlayment, it's seems to be like talking who makes a better truck...Ford or Chevy. My contractor wants to use #15 paper under my metal roof. I know the game; buy the cheapest and charge the most.
With that I will go buy my own underlayment. I think that I will buy synthetic underlayment thought confused about the vapor barrier and not breathing.
I'm worried about the metal roof sweating.
My old roof will be removed. Then from what I read, it go's 1)underlayment 2) rosin paper, then metal roof. If I used synthetic, then I can scratch the rosin paper???
My contractor also doesn't feel the need for a ice barrier under the underlayment; stating that my roof is steep enought, yet he is going to install snow cleats. Any help???
Or copy this URL:
https://www.metalroofing.com/spirit/comment/15437/find/
A metal roof sweats as a result of moisture from the living space meeting the cold roof.
If the underlayment were non-permeable to vapor, it would be more likely to mitigate sweating, not encourage it.
Most of the underlayments are designed to have a certainly perm rating but that is not designed to be your vapor barrier.
Control the moisture from the home at the home and not the roof line.
Eric Novotny An informed customer is the Best Customer!
12/6/2010
Share
Or copy this URL:
https://www.metalroofing.com/spirit/comment/15438/find/
12/6/2010
Or copy this URL: https://www.metalroofing.com/spirit/comment/15437/find/An informed customer is the Best Customer!
12/6/2010
Or copy this URL: https://www.metalroofing.com/spirit/comment/15438/find/