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Question DetailsAsked on 11/11/2017

I have to hire a new roofer to fix what the first roofer messed up.should i have metal roof taken off and replace e

Shoyld i replace plywood and shingles and have metal put back on roof. Or replace wood around the edge

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Hope the first roofer, or his bonding company, is paying for this redo.

You don't say WHAT he did wrong - but if serious issues then the tearoff should go down (locally maybe if say just flashing issues, or total roof if a whole-roof problem) as many materials layers as necessary to repair the problem. I am not at all sure why the wood around the edge is the problem, unless the fascia boards were rotten - which could be replaced with just a limited tearoff at the lower edge of the roofing.


My opinion (though not industry standard) is that you should not put metal roof over shingles - they should be taken off, not only to ensure a planar surface (when done over shingles commonly gets wavy), to be sure the fasteners properly bite into the wood, and to replace the water barrier - which will be old now so counting on another 50 years of effective life under the new roofing is really asking a lot.


If the plywood is of adequate thickness for the fastener grip (commonly 15/32 - nominal 1/2" thickness though more in some areas by code) and in good condition, no reason to replace it. IF you do replace it, my recommendation for probably less than 2-3% addition total job cost - specify true 1/2" exterior rated treated plywood or greater thickness if required by local code for snow loads, pressure treated to resist rot if it does get wet - and not particle board or OSB or such - they fall apart badly when they get damp, even if only from attic condensation or frosting.


Course, if the metal roofing manufacturer installation instructions or warranty say not to put over existing shingles (as some do), that would certainly strengthen any claim against him and/or his bonding company - though of course that claim would have to be filed and accepted BEFORE doing the reroof, not after you have another contractor fix it.

Answered 1 year ago by LCD




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