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galvalume vs aluminum

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michael Calloway
7/15/2010
I have been told not to use Galvalume on my house near the shore because it will eventually rust where it is cut. I have been advised to use just an aluminum metal roof. Galvalume tends to be cheaper. Does anyone have any advice here?
Eric Novotny
An informed customer is the Best Customer!
7/16/2010
Plenty of coastal applications where Galvalume is used extensively with no problems. If you are concerned about it, have your roofer apply a sealant or paint to the cut edges of the panel. Depending on the layout of your roof, that may or may not be labor intensive.
Guest User
7/19/2010
Thanks. Another question: my roof has 2 old asphalt layers and one wooden layer that I understand have to come off. Some contractors tell me I need to put down plywood before the standing seam roof, others say i don't and it can be installed right over the roof without the plywood. Which is the best way?
Eric Novotny
An informed customer is the Best Customer!
7/19/2010
What is the wooden layer? Plywood, wood shakes, etc? Best bet, although not cheapest, would be to remove those layers and lay the new roof on a flat and secure base.
Todd Miller
Isaiah Industries, Inc.
8/1/2010
I do think for coastal applications aluminum can be an excellent choice. The individual manufacturer will be able to give you installation details but my preference is to go over exisating roofing or solid decking, both with underlayment.
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