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We currently have a house under construction on the Isle of Palms, a barrier island just outside Charleston, SC. Our
builder has recommended a 5 v-crimp Galvalume Roof. However, we have been advised by
some island residents that metal it does not hold up and is not covered by warranty in thissalt-air climate.
Please advise as we have to make a decison soon.
Respectfully, Patrick Harrington
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The coast is hard on all exposed construction materials. Steel profides you with great wind uplift protection and strength. Galvalume and Galvanized steel are metalic coated for weathering protection of the steel core.
Galvanized steell is coated in Zinc while Galvalume steel is coated in a 55% zinc/45% aluminum mix which becomes an alloy make the steel stronger. You get the sacraficial weathering protecting of the zinc and the longevity of the aluminum.
Galvalume will outlast Galvanized up to 6 times longer in a marine environment. If you are directly on the ocean and have the potential for direct salt spray then it will shorten the life span. The farther back from the waterfront the longer it will last.
The Galvalume coating weight is designated as AZ and you should specify a minumum of AZ50 however I would order an AZ55 which will provide superior resistance. Make sure that they clean all the filings off the roof from cutting and screwing etc, and that they use sharp cutters so that the Galvalume coating is wiped over the cut edge.
As a side note there ara a number of member manufacturers like Dura-loc and American Roofing Industries that produce granular coated roofing products from Galvalume that provide additional protection with the coating. Check us out.
2/21/2003
Or copy this URL: https://www.metalroofing.com/spirit/comment/1642/find/Dura-Loc Roofing Systems, Inc.
2/21/2003
Or copy this URL: https://www.metalroofing.com/spirit/comment/1643/find/