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  1. #1
    brianmiller's Avatar
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    Default Standing Seam Metal roof covering

    Do manufacturers allow the standing seam metal panel roof covering to be installed on top of asphalt composition shingles?

    brian

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  2. #2

    Default Re: Standing Seam Metal roof covering

    You would have to check with the manufacturer, but this is a common installation. The old shingles will help protect the decking from condensation. I'd have to look it up, but I'm pretty sure that at least in OR, you can install a metal roof over 3 layers of comp, because it does not add much more weight to the roof.


  3. #3
    Join Date
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    Ormond Beach, Florida
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    Default Re: Standing Seam Metal roof covering

    Last time I looked the answer was 'No.'

    At least not without first installing some type of paper or recovery board over the shingles to prevent the granules in the shingles from scratching into and through the finish on the back of the metal roofing panels and to also serve as a slip sheet to allow the metal roofing to expand and contract over the shingles. And I am not even sure this is approved by the metal roofing manufacturers - I do not believe it is in their installation instructions.

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  4. #4
    brianmiller's Avatar
    brianmiller Guest

    Default Re: Standing Seam Metal roof covering

    I didn't think this was proper installation , and beside, the must of run out of panles because the panels end about 18 " from the rake end exposing the comp shingles and allowing water to run under the panels.

    And never mind the screw fasteners installed on top of the seams...the list went on....


  5. #5
    Michael Garrity's Avatar
    Michael Garrity Guest

    Default Re: Standing Seam Metal roof covering

    Always start with a clean deck and the recommended underlayment


  6. #6
    brianmiller's Avatar
    brianmiller Guest

    Default Re: Standing Seam Metal roof covering

    Would you recommend removing both roof covering and starting over?


  7. #7
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Standing Seam Metal roof covering

    Quote Originally Posted by brianmiller View Post
    Would you recommend removing both roof covering and starting over?
    BM: Yes.


  8. #8
    Join Date
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    Default Re: Standing Seam Metal roof covering

    Quote Originally Posted by A.D. Miller View Post
    BM: Yes.
    Ditto. No more short cuts for those apes.


  9. #9
    Join Date
    Feb 2008
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    Default Re: Standing Seam Metal roof covering

    Have seen metal roofs fastened to spaced strapping placed over asphalt but never metal directly on asphalt, the idea is to have an air space under the metal to dissipate heat and reduce expansion.


  10. #10

    Default Re: Standing Seam Metal roof covering

    Brian,

    I'd be careful with my report on this one if I were you. After spending a few minutes Googling your question, the answer seems to be that it's just fine to install a metal roof over shingles. You may need to install felt, wood strips, etc. depending on the manufacturer. You could end losing credibility if you start making an issue of something that may in fact be a non- issue.

    Here's one small write up on the subject: Put a New Cool Metal Roof over Your Old Asphalt Roof - Metal Roofing Alliance eNewsletter Archive

    Adding a metal roof over existing shingles doesn't seem like an issue to me at all. Wouldn't installing metal over an existing asphalt roof instead of doing a tear off first be considered a green building technique?


  11. #11

    Default Re: Standing Seam Metal roof covering

    the must of run out of panles because the panels end about 18 " from the rake end exposing the comp shingles and allowing water to run under the panels.

    And never mind the screw fasteners installed on top of the seams...the list went on....

    Well,

    that sounds like a crap installation.

    It sounds like you have a typical shop style roof with exposed screws holding the panels down. Now, that is a problem, because they are know for leaking. Those should not be used over a residential structure....


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