Roofing over old roof.

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Old 10-09-07, 07:44 AM
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Roofing over old roof.

How bad is it to roof over an old roof? Ive heard of this being done in order to save $. I am my only source of income so money is always tight. Thanks for any input.
 
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Old 10-09-07, 08:13 AM
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Roof overs are not recommended. The old roof will continue to deteriorate beneath the new. The new roof will trap moisture in the old. You will have the extra weight and heat mass on the roof. Read more here: http://water-proofing.com/ar/roofover.html
 
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Old 10-09-07, 08:36 AM
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Thanks for the info... guess I can only hope to find a place who takes Credit Cards!
 
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Old 10-09-07, 09:58 AM
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If you only have 1 layer of asphalt shingles, and they are still laying flat, some homeowners will decide to roof over. I have no objection to roofing over once, provided the old shingles aren't bumpy. Weight is an issue, so you don't want any more than 2 layers of asphalt shingles on a roof.

But if your old shingles are curled at all, you definately want to tear off. Some contractors will absolutely not roof over, some don't care and will roof over anything. I'm somewhere in-between.
 
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Old 10-10-07, 06:46 AM
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Some of the better shingles require a tear-off for warranty.

I just redid my roof which had three layers. Though the top layer was in relatively good condition, the two layers beneath it were crumbling and problems were developing along the edges.
 
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Old 10-10-07, 12:20 PM
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Recover

Installing a recover is a common practice however, whether or not it is suitable for your home is dependant on several factors, some of which are:

Local Building Code
Composition of the existing roof and deck
Condition of the existing roof and deck
Pitch of the roof
Climate
New material selection
etc.

Consult with a local Roofing Contractor or Roofing Consultant to determine your options.

Good Luck!
 
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