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Old 03-08-2012, 07:55 PM   #1
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Metal roof install


We are adding a metal roof to an existing roofed residence. A couple of questions for the pros. If the roof appears to be in over-all good shape, should the shingles be removed prior to adding a metal roof? Either way, shingles removed or not, does the roof also require strapping? If so, is this for air movement or another reason? Any additional advice is appreciated.
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Old 03-08-2012, 08:00 PM   #2
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Metal roof install


If it is a residence, strip it. if it is a barn, go right over it.

it is not necessary to strap the roof, but a good 30lb felt or equivalent should be under the metal.

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Old 03-08-2012, 08:59 PM   #3
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Metal roof install


Either take off the shingles or strap over them, do not put metal on right over the shingles.
I used to sell the stuff from 3 different suppliers and they all said this.
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Old 03-08-2012, 10:02 PM   #4
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Metal roof install


strap them and cover it save you time as long as your roof has only one layer of shingles. Use 30 lb felt min
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Old 03-08-2012, 10:37 PM   #5
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Metal roof install


Shingles hold moisture for a long time. If you cover shingles and not provide a way to ventilate the metal roof it will fail prematurely. If you possible can, remove the shingles. The strapping is the second choice.
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Old 03-08-2012, 10:49 PM   #6
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Metal roof install


removing shingles also lessens the weight. gives a smoother surface
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Old 03-10-2012, 10:55 AM   #7
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Metal roof install


strip the roof.
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Old 03-13-2012, 11:40 PM   #8
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Metal roof install


While you don't have to pre-drill holes for your screws, pre-drilling panels will make it easier to get the screw lines straighter. - You can predrill a stack of about 10 panels at a time. - Make sure you measure for pre-drilling accurately.

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