Dale Rademacher
fixit
3/21/2016
Hello, I am having a metal roof installed on my double wide, The original shingles are 16 years old and in good shape. The contractor says he puts a radiant barrier down before the 1x4 pulins. In my research It looks like most people also put 3/4 inch fanfold insulation between the purlins, Are both needed? Does the fanfold help keep heat from roof deck? I like the idea of the fanfold if it helps out with quieting and or heat dispersion. I have heard of something called bubble wrap, Is this another kind of barrier? Thanks
Eric Novotny
An informed customer is the Best Customer!
3/22/2016
Both are not needed, but insulation would be preferred in your climate. What does your contract say?
Dale Rademacher
fixit
3/22/2016
He prefers to use an underlay. I am thinking about talking him into the fanfold instead, just wanted to check if you thought I needed both. Thanks for the response.
Eric Novotny
An informed customer is the Best Customer!
3/22/2016
Depending on the insulation levels in the roof, you would be well served to add additional insulation above and beyond the level of fan-fold. Something like 1" poly iso with a foil facing would be better.
Dale Rademacher
fixit
3/22/2016
would this be placed between the purlins?
Eric Novotny
An informed customer is the Best Customer!
3/22/2016
Ideally it would be full sheets and the purlins would be fastened over the top of it.
Dale Rademacher
fixit
3/22/2016
Thanks
Dale Rademacher
fixit
3/22/2016
One last question, Is it a complete myth that a metal roof on a double wide will increase summer heat?
Eric Novotny
An informed customer is the Best Customer!
3/23/2016
Yes. Color and orientation have everything to do with heat absorption.

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