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Roofing and Siding since 1985
Sat, May 16 2026, 2:43pm [ Login ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, [3] ]
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Date Posted: Fri, Sep 13 2002,10:03am
Author: jo
Subject: Shingle over existing shingles

Is it ok? How do you do it? When should it be avoided?

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[> Re: Shingle over existing shingles -- A Roofer, Sat, Sep 14 2002,11:48am

"Shingle over existing shingles
Is it ok? How do you do it? When should it be avoided?"

"Is it ok?"
Legally you can go over any existing roof installing up to three layers.
As far as my company goes, we will never go over an existing 4/12 or less composition with another composition and we would never install a third roof on a house.

"How do you do it?"
Some companies just go right over the existing roof. We cut the comp back on the gables and the bottoms installing a drip metal on the gables and a starter metal on the bottom. We also try to incourage the homeowner to use some felt paper over the existing roof but this isn't neccessary.

"When should it be avoided?"
Your roof has to be in good enough shape to go over smoothly. Although I've seen many roofing companies go over a 4/12 roof I never do because where the comp over lapped each other in the first installation is where it will over lap in the next installation creating a higher seam for the water to flow over.

Hope this helps,
A Roofer


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