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Old 02-27-2012, 04:16 PM   #16
MJW
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Re shingle or over shingle ?


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Originally Posted by framer52 View Post
iN MY EXPERIENCE 2ND ROOFS AS LONG OR LONGER THAN FIRST ROOFS.

Of course i am only 57 and installed only around 5000 squares starting in the late 70's.

Now it has been 5 years since I have installed, but the roofs I have laid over over the years have held up well.
Just the opposite here. Usually they last about half the warranty. If they are installed correctly maybe another 5 years, but they look very worn by then.

Maybe in your experience the second roof is a higher quality shingle.

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Old 02-27-2012, 04:17 PM   #17
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Re shingle or over shingle ?


Make sure you check your local codes. Here, you cannot do a second layer.
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Old 02-27-2012, 07:35 PM   #18
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Re shingle or over shingle ?


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Incorrect. shingle manufacturers don't care.
I have an invoice that says otherwise....but we all have our opinions...thanks..
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Old 02-27-2012, 08:26 PM   #19
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Re shingle or over shingle ?


What kind of shingle, Mikey? Wood, asphalt, metal.....

Are you under the IRC?

R907.3 Recovering versus replacement.
New roof coverings shall not be installed without first removing all existing layers of roof coverings where any of the following conditions exist:

1. Where the existing roof or roof covering is water-soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing. 2. Where the existing roof covering is wood shake, slate, clay, cement or asbestos-cement tile. 3. Where the existing roof has two or more applications of any type of roof covering.

Exceptions:
1. Complete and separate roofing systems, such as standing-seam metal roof systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support, shall not require the removal of existing roof coverings. 2. Installation of metal panel, metal shingle and concrete and clay tile roof coverings over existing wood shake roofs shall be permitted when the application is in accordance with Section R907.4. 3. The application of new protective coating over existing spray polyurethane foam roofing systems shall be permitted without tear-off of existing roof coverings. 4. Where the existing roof assembly includes an ice barrier membrane that is adhered to the roof deck, the existing ice barrier membrane shall be permitted to remain in place and covered with an additional layer of ice barrier membrane in accordance with Section R905. From: http://publicecodes.citation.com/icod/irc/2012/icod_irc_2012_9_sec007_par002.htm

Check with your local AHJ.

Gary

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