Re shingle or over shingle ?

MIKEY 43

Can you overshingle a roof without major problems ?

joecaption

Can you, or should you?
Yes in most cases it can be done, but there's no way to check for bad sheathing, I hate the the way it looks, never seem to lay as flat as one layer.
I've also found there do not seem to stick down as well.
How bad is the roof you have now, what trpe roofing system do you have. Trusses, stick built. How wide are the rafters.

diy'er on LI

Also I believe it reduces the life span of the new roofing layer... because it's not sitting on an ideal surface.

Windows on Wash

For the small saving in tear off and dump fees, I do not recommend it.

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ben's plumbing

can you yes,,should you no...why...that is not how it should be done....as reasons some were already mentioned.....side thougth...tell shingle manufactor your going over existing roof....warranty void...

Roofmaster417

Oh yes.,Someone is trying to stir the DIY demons with this post.It happens everytime someone speaks of recovers.

It is a topic that is frequent and is answered the same way by the same people who don't share the same views.

Reroofing over old shingles This is one of very many on this site.

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Gymschu

As a DIYer who had to shovel THREE layers of shingles off his roof, I implore you NOT to overlay. You will thank me for this simple plea in 15-25 years. In some regards, shingling over one layer could be seen as good for the environment.........less shingle trash tossed into a landfill......but, like I said, what a pain trying to get 2 or 3 layers off a roof......nasty, nasty work.

OldNBroken

Ben;s Plumbing, Can you please tell us what mfrs void the warranty on a recover?

Can you recover? Yes and it can be perfectly fine if done correctly. Check local building codes for number of layers allowed.

It is always ideal to tear it off for numerous reasons but we don't live in a perfect world.

ben's plumbing

oh and by the way did he say nasty nasty work...........well if he didn't its nasty nasty work

Roofmaster417

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Slyfox

Manufacturers not only guarantee their materials in a lay-over but they actually give installation instructions on their websites.

If your in the Youngstown, Ohio area I can show you a dozen lay-overs in which the shingles are 20 years old "give or take" and still intact today.

I personally have seen sales reps bid tear-offs as one layer re-roofs and find later that there is two layers of existing shingles, because if there installed properly you cannot see the additional layer unless you inspect the roof hands on.

My personal home was re-roofed "tear-off" in 2010, it had two layers on it at the time, the second layer of owens corning 3-tabs was 21 years old and still not blowing off or leaking, it could have lasted an easy 5 plus years longer but because I was painting my home "changing the color scheme" I chose to re-roof it than anyhow.

That's hands on experience talking from a roofer with over 30 years in the trade.

Show me a lay-over that is lumpy, blowing off, looks bad in other ways or doe's not meet it's expected life span and I'll show you a lay-over installed by some one who didn't know what they were doing..

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framer52

Incorrect. shingle manufacturers don't care.

Tom Struble

but not all shingles can be installed on an overlay,i believe ct presidentials
can't

PAHome

I would highly recommend removing the existing layer before installing the new roof. You will save money in the short run but it will cost you way more in the long run. The next time you need a roof, which if you are lucky will be in 10 years, it will cost you.

Don't think of your roof as an expense but an investment.

framer52

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.