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Should Galvalume sheet roofs be installed on decking or over shingles?

April 26, 2017decking galvalume installed roofs Sheet Shingles

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Should Galvalume sheet roofs be installed on decking or over shingles?

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Wood or steel decking is normally used for prepainted Galvalume architectural roof systems on both residential and nonresidential applications, but it is not recommended to install the panels in direct contact with the decking. Instead, 30 pound felt, or an equivalent, should first be installed on the decking and the roof panels then installed over the felt. For residential applications, the roof panels would be installed over roofing felt on wood decking for new construction applications, or in applications in which the old shingles would be removed from the deck.