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TOPIC: General Discussion

metal over osb & shingles

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I am installing a metalroof over one layer of existing shingles. My plan is to install a layer of synthetic underlayment first. The decking is OSB and in good condition. Will the osb hold the screws sufficiently or would I need to install 1" x 4"'s first and then screw to those? Any advise is appreciated.
tommy oswalt

2/8/2008
As long as the OSB is sound and there are no ventilation problems in the home, you should be fine. Not all metal roofing products by the way can be installed on 1 x 4 s. Todd Miller
Todd Miller
Isaiah Industries, Inc.

2/9/2008
Thanks, This is 26ga. bare galvalume 5v crimp.
Guest User

2/9/2008
I assume you are aware that that product is on the lower end of metal roofing in terms of ultimate durability. Todd Miller
Todd Miller
Isaiah Industries, Inc.

2/10/2008
Are you saying it has a lower durability due to the metal not being painted? The bare galvalume is the look I was wanting, I did not want the painted metal look.
Guest User

2/10/2008
If you are purchasing prime Galvalume Plus material (AZ55), and it is properly engineered and installed, it should perform as well as any other metal roofing product.
Ken Buchinger
NCI Building Systems, Inc.

2/11/2008
grayluke, You said bare gavalume and I believe that is what Todd is replying to. Ken made a reference to galvalume plus. You can get either one on the market. Galvalume plus is galvalume that has an acrylic coating (clear). As an installer the galvalume plus is a better material than the bare galvlaume. The acrylic coating helps protect the galvalume finish from minor scratches during installation. I know they say the galvalume is self healing but you still have a better product if it is coated.(the warranty is longer) [email protected]
Guest User

2/11/2008
Thanks for your input, Wade, as always. Todd Miller
Todd Miller
Isaiah Industries, Inc.

2/11/2008