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Old 04-23-2008, 06:54 AM   #16
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Please HELP me help my mom with her house


A lot of HO's assume they can add layer after layer od comps on a roof, and no big deal. I see this all the time.....a guy can hold a 3 tab, or even an architectural shingle up and say "this hardly weighs anything"...when in reality, a comp roof starts at 300# per square (3# per square foot) and goes up, depending on the shingle. I will say I have rarely seen high definition or 5 year shingles overlaid on existing, probably because the HO's that will spend money for these will pay to have the roof stripped and done right. I have seen roofs with 4 layers of 3 tabs.....on a 30 square roof, and you guys do the math.....that is a hell of a load for a roof to support.

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Old 04-23-2008, 10:24 AM   #17
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Please HELP me help my mom with her house


Not pro here.

Personally, I would not put in supports for anything until I had removed all of the previous roofing material. Better to support it after it bounces back than to be holding down in the wrong place.

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