In some cases you can.
How to take shingles off a roof.
Continue tearing off the shingles and underlayment until you reach the roof jacks then start over at the top of the roof.
The shingles will roll up like a ball in front of the fork.
If you re in doubt an experienced contractor can help you understand the pros and cons of installing new shingles on top of the old ones.
Generally shingles have a life span of 15 to 20 years before they begin to deteriorate.
Push the shingles down to the roof jacks.
Determine if the existing shingles need to be removed.
Removing asphalt shingles is a big job and you might be temped simply to lay the new roof over the old one.
The essential process you ll follow to tear shingles off a roof is listed below with a detailed explanation of each step.
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How to remove old asphalt shingles before putting on a new roof.