Quote:
Originally Posted by webmaster
The weight of one layer of shingles could add a couple thousand pounds to your roof. From what I've read it's about 250 lbs. per 10' X 10' area. If you don't remove the first layer when replacing it you are doubling the stress. When we have a lot of snow in the winter everyone is worrying about roof collapses and damage. Do you really want to add a few more thousand pounds in roofing on top of the existing weight?
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There are a few factors to consider such as the pitch of your roof and the age of your home. There are many cases where roofing over an existing roof is fine. Then there are others that are questionable. It's always best to strip a roof but it's not always a must.