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Applying new shingles over old ones.

Posted by Andrew on April 26th, 2003 02:19 AM
In reply to DO YOU START AT THE BOTTOM OR THE TOP WHEN LAYING SHINGLES ON A ROOF by J.R. on November 1st, 2001 01:22 AM [Go to top of thread]

Dear Bob;
I am a new owner of a 20 year old home. My house is due to have the shingles replaced and I have read in books and internet sites that you can apply new shingles over old ones (up to maximum of 3 layers). Are there any downfall to applying over old shingles? Does it affect the new shingles integrity? Hope you can help answer this for me.

Fan of yours

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