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TOPIC: Roofing over existing roof

metal over existing torchdown

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Hi, We have been quoted by two different contractor regarding replacement of our two layer torchdown roof with metal. One says they torchdown must be stripped off and the other says it does not need to be. Apparently the issue is the metal "mirroring" or "telegraphing" any uneveness in the torchdown roof over time. Also, is telegraphing a cosmetic problem or an issue of the long term integrity of the metal. Thanks for your speedy reply!
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4/20/2006
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That sort of thing is largely a cosmetic problem. There are a lot of other factors here including the gauge and profile of metal roofing being installed. There are inexpensive "recovery boards" which can be put down over the existing as well. Here's what I would do: take pictures of t existing and email them to the manufacturer(s) of the roofing that is being proposed for inbstallation, tell them which of their panels is to be installed, and see what they have to say. If they don't have much to say, by the way, that might be indication to look for a manufacturer who cares about you and your roof and will give you proper advice. Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/20/2006
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thanks for your quick reply. the one manufacturer i contacted did indicate that they suggested a tear off or a plywood overlay. it just seems needlessly expensive to tear off a perfectly good torchdown roof (it is getting to the end of it's life and needs to replaced, but it is sound and has never leaked.) And I think i would prefer the added insulation factor of leaving the existing roof. We would be installing a 26 gauge Snaploc Champion product. This is on a low pitch roof, and it cant be seen by anyone put the birds in the treetops, so cosmetic issues arent really a major factor. I will bring up the "recovery board" information with my potential installer and see what the additional cost is. We like the idea of a low maintenance metal, but it is pricey and we want to be as cost effective as possible without sacrificing long term quality.
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4/20/2006
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I understand. If you wish, send me photos of the roof for my input ... [email protected] ... but I would never do anything that is not in keeping with the manufacturer's instructions. Todd Miller
Todd Miller
Isaiah Industries, Inc.

4/20/2006
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