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JCWOLFO03
Re-shingling

We live in a condo housing development and they are in the process of re-shingling the roofs of the 75 units in the association. The old shingles are 18-20 yrs old and they are going to re-shingle over the top of the old shingles. My question is: Should (concern) the old shingles be removed first, or can the new shingles be installed over the old shingles WITHOUT any future concerns?

A. Spruce
Re: Re-shingling

Overlays are common and acceptable, however it is the opinion of most of us here that the old should be stripped bare first. Overlays do not look as good nor last as long as single layer roofs.

JCWOLFO03
Re: Re-shingling

Dear A. Spruse, thank you for your reply. Naturally, the reason for the way they chose to "overlay" the old shingles was due to cost of first removing the old ones. Just hope they're not throwing (our) good money after bad.

A. Spruce
Re: Re-shingling

And that would be the ONLY reason that overlays are done. The thing is, you're not really saving much money, particularly if the lifespan of the roof is diminished by 5 to 10 years because of it. To make matters worse, then next reroof is going to cost even more because now there are TWO layers that must be stripped off instead of one.

jkirk
Re: Re-shingling

precisely as a spruce states. the other thing is, if there is any spots where the roof is leaking they wont see it and fix any bad spots in the roof decking

Petty Roofing, Boise
Re: Re-shingling

The most common shingles in use 20 years ago were three-tab fiberglass backed shingles. The fiberglass reinforced shingles manage to maintain their looks because they don't shrink or curl very much as they age, but they do get continuously thinner and weak. Re-roofing once over this type of shingle is perfectly acceptable and should not reduce the lifespan of the new roof as long as the attic space has sufficient airflow. The big drawback to a re-cover is the increased cost when the roof needs to be done again. Today's laminated shingles designed to last 30, 40, or 50 years, make that primarily a problem for the next home owner.

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