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Old 06-08-2012, 11:04 AM   #1
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Basic roofing question


Hi everyone. i'm a carpenter type guy helping a buddy re-roof his garage. I have shingled quite a few times, but mostly tear off or new construction. My question is what length coil nails to use, since we're going over one layer of existing shingles (old three tab and we're using new three tab as well). I'm thinking 1 3/4" ? Also is ice and water shield neccessary over old shingles on a garage? Thanks in advance for any help.
Tom


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Old 06-08-2012, 07:00 PM   #2
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Basic roofing question


If I were to do a layover I would use 1 3/4" nails.

Ice&water is not necessary as its best suited to be installed on a clean roof deck.

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Old 06-08-2012, 07:20 PM   #3
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Basic roofing question


Do they intend to live in this house a long time?
Reason I'm asking is 3 tabs by far have the shortest life span of any shingles.
Doing a roof over will not allow you to see if there's any sheathing damage, will not lay as flat, will cost twice as much to remove once they wear out.

I've seen far more tabs blow off of roof overs, it's seems like they never get hot enough to really seal.
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Old 06-08-2012, 08:39 PM   #4
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Basic roofing question


It's been my experience that a roof over actually gets hotter thereyby shortening the life span of the new shingles. The reason for the blow offs is that the old shingles don't allow the new shingles to lay flat and the tar seal doesn't make very good contact. For these reasons I haven't done a roof over for quite some time. If they want a roof over someone else will have to do it.
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Old 06-10-2012, 08:00 AM   #5
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Basic roofing question


1-3/4" is sufficient and no moisture guard.

If I say anything else about recovers on this forum we will all go down the "Recovers" and why we hate them path.
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Old 06-10-2012, 09:59 AM   #6
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Thanks, everyone. Went w/ 1 34" nails and i'm glad I did. Actually there were two layers of old shingles. The first layer was almost completely disintegrated. Oh well, he had to get this done for his homeowners ins., so he just wanted it done quick and w/o a permit. Hope they seal. Yesterday was a hard day, hope we don't end up re-doing it.

Tom
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Old 06-10-2012, 11:46 AM   #7
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Basic roofing question


One other point for NOT covering the old shingles is the weight factor. Especially if this is the third layer of shingles. At approx. 80 lbs/bundle, do the math and you'll see what the garage roof will be holding up, plus any snow or other stress.
Good luck.
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Old 06-14-2012, 09:23 PM   #8
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if your going over just one shingle roof then thats what they make 1&1/4" nails for.
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Old 06-14-2012, 09:39 PM   #9
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Quote:
Originally Posted by tompatrick
Thanks, everyone. Went w/ 1 34" nails and i'm glad I did. Actually there were two layers of old shingles. The first layer was almost completely disintegrated. Oh well, he had to get this done for his homeowners ins., so he just wanted it done quick and w/o a permit. Hope they seal. Yesterday was a hard day, hope we don't end up re-doing it.

Tom
No building code? If homeowner ever decides to sell, the roof may have to be replaced again.
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Old 06-14-2012, 11:11 PM   #10
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Basic roofing question


two layers is different than one layer. most states you can put 3 or even 4 layers on.
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Old 06-15-2012, 09:18 AM   #11
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Quote:
Originally Posted by hotrod351
two layers is different than one layer. most states you can put 3 or even 4 layers on.
Which ones?
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Old 06-15-2012, 03:48 PM   #12
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GA is a state where you can have more then one layer but I think max is 3.
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Old 06-16-2012, 09:55 AM   #13
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Brilliant,,,now your friend has 3 layers,,,hahahahahaha,,,what are friends for.

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