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Old 01-20-2012, 12:59 PM   #16
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Reroofing over old shingles


I have installed recovers without incident.Different projects require different installations.It is up to the contractor to provide knowledge on the type of process needed and for the homeowner to listen to that advice.

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Old 01-20-2012, 01:10 PM   #17
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you charged your Mom?
Yes.,But I did eat her deductible.

Besides if you knew her you would understand how for some reason she does not want special favors.She was clueless about the deductible though.It was an insurance claim and she thought the insurer covered it.hahahaha

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Old 01-20-2012, 01:58 PM   #18
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Overlays are not legal in the hail zone of the country.

Aside from what the others have said, your new roof over old shingles will only last about half as long as they should.

Yes, it can be done if done correctly, but still not as good as a reroof.

It's funny how I see some people say that you must remove everything down to the sheathing on every re-roof to inspect, but then say it's ok to shingles over old shingles.

What is your location?
It's a proven fact that lay-overs installed properly will achieve a full expected life span.
The only reason there not allowed in certain area's is because of the difficulty level of installing them (correctly), which is also why they get such a bad rep, because if you do a lay-over wrong it will be a disaster.
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Old 01-20-2012, 02:01 PM   #19
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Overlays are not legal in the hail zone of the country.

What is your location?
I am in Oregon.

I think I will do a tear out and replace what needs to be replaced. It is only the one side of the roof and house, about 600 sq ft of sloping roof.
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Old 01-20-2012, 02:14 PM   #20
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Originally Posted by Slyfox

It's a proven fact that lay-overs installed properly will achieve a full expected life span.
The only reason there not allowed in certain area's is because of the difficulty level of installing them (correctly), which is also why they get such a bad rep, because if you do a lay-over wrong it will be a disaster.
I don't think any comp manufacturer would warranty the shingles for even a day as they can't guarantee the condition of the existing shingles.
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Old 01-20-2012, 02:40 PM   #21
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I'm pretty sure the reasoning for not allowing a second layer is because of hail and insurance companies. As a homeowner it is still legal to go over the existing roof, but Contractors are prohibited. That is, if your state is using the IRC code. Some contractors in other states can use a different code that their state accepts and can get by doing an overlay.

In my experience, overlays don't last like a new roof and the warranty is likely void.

Every region is dramatically different. I would guess Oregon has quite a bit of rain, but that's about all I know about that area.
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Old 01-20-2012, 02:44 PM   #22
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I don't think any comp manufacturer would warranty the shingles for even a day as they can't guarantee the condition of the existing shingles.
I can't speak for all shingle manufacturers, but as far as the one's I install here in my region, they all honor their warranty on lay-overs.
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Old 01-20-2012, 02:59 PM   #23
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If you just nail new shingles over existing, your not installing a roofing system.

To do a lay-over requires a lot of prep work, so once your finished it looks no different then it would if you had done a re-roof.
If you don't know what I mean than you have never seen a properly installed lay-over.
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Old 01-20-2012, 03:00 PM   #24
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I'm pretty sure the reasoning for not allowing a second layer is because of hail and insurance companies. As a homeowner it is still legal to go over the existing roof, but Contractors are prohibited. That is, if your state is using the IRC code. Some contractors in other states can use a different code that their state accepts and can get by doing an overlay.

In my experience, overlays don't last like a new roof and the warranty is likely void.

Every region is dramatically different. I would guess Oregon has quite a bit of rain, but that's about all I know about that area.
I would have to guess you have never seen a properly installed lay-over then.
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Old 01-20-2012, 03:03 PM   #25
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I should add, I don't sale lay-overs, I always suggest a re-roof first and explain that is the best way to go.

I have/will do lay-overs in certain circumstances, because I know through hands on experience that the procedure works if you know how to install it.
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Old 01-20-2012, 03:28 PM   #26
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I have done properly installed overlays before the new laws went into effect.
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Old 01-20-2012, 03:31 PM   #27
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Quote:
Originally Posted by Slyfox
I should add, I don't sale lay-overs, I always suggest a re-roof first and explain that is the best way to go.

I have/will do lay-overs in certain circumstances, because I know through hands on experience that the procedure works if you know how to install it.
What's different about the installation? I can't really think of anything, except maybe sweep the roof off first. It doesn't take a rocket scientist to throw some shingles down, whether it be over felt and wood sheeting or felt and shingles.
Oh yeah. Longer nails.
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Old 01-20-2012, 03:34 PM   #28
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I have done properly installed overlays before the new laws went into effect.
I just assumed you hadn't done any yourself, sorry.
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Old 01-20-2012, 03:40 PM   #29
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Sorry but I thought he said his roof was leaking, I can't see how you could possibly even consider doing a layover over that and when a homeowner tells you he has leaks, you have to know he has wood issues, I certainly was not trying to "trap" a contractor, but I sure am gonna check it myself and know what is bad myself before he tells me some bs that all is well and just throw some shingles over the old ones. I did not say I was'nt gonna pay the guy for the work he did, but I am not gonna pay for slop.
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Old 01-20-2012, 03:41 PM   #30
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What's different about the installation? I can't really think of anything, except maybe sweep the roof off first. It doesn't take a rocket scientist to throw some shingles down, whether it be over felt and wood sheeting or felt and shingles.
Oh yeah. Longer nails.

There's much more prep work than that if your going to do it properly.

Cutting the tabbed portion of the existing off in certain areas, not just the eaves.
Cutting the existing shingles back even with the overhangs, so new drip can be installed.
Installing new flashing's on penetrations.
Upgrading ventilation, if needed.
Etc............

Just covering the old roofing system with new shingles is not the proper installation method.

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