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-   -   Reroofing over old shingles (http://www.diychatroom.com/f9/reroofing-over-old-shingles-130679/)

bobsalas 01-19-2012 08:51 PM

Reroofing over old shingles
 
I have a 15 year old roof that is leaking is two places.

The front is the only one that is leaking. It is steep roof about 20 feet by 30 feet.

I am wondering what the cons are for laying shinlges right over my existing roof.

I mean what is the worst that could happen?

joecaption 01-19-2012 08:57 PM

It weould cost twice as much to strip it next time. It will look like poop and have waves in it. The shingles will never get hot enough to bond together, no way to see if the sheathing is shot and needs to be replaced. And that's to name just a few reasons. I flat out refuse to do a roof over.

If it's been leaking then there's got to be sheathing damage under the shingles. If it's not fixed how would you expect the nails to hold the new shingles to the roof?

OldNBroken 01-19-2012 09:03 PM

Each project is different and without seeing yours one cannot tell you 100% if it is feasible or not. That said, in general yes a recover is an option. Not a preferred option but still an option.

It actually WILL seal down properly if properly installed. Yes it may not come out as smooth as going over a smooth deck, but that doesn't mean it is wrong. Yes, one thing you want to ensure is that your roofdeck is sound and not rotted away. One way is to get in the attic and look at it from below. If there is major damage it is not recommended.

Although a tearoff is always preferred, we understand that sometimes finances stand in the way of that. In this situation a recover is always a viable option providing it is not violating any codes.

titanoman 01-19-2012 09:07 PM

I agree with Joe. I would be more inclined to roof over the existing roof if it wasn't leaking, but since it is, you need to see what the wood looks like underneath.
For all you know, it could be so bad somebody could fall through.
What do the shingles look like? Are they nice and flat and unbroken?
Are they 3-tab or Architecture?
Have you looked in the attic at the leaks?

gopher59 01-19-2012 09:14 PM

You must consider the weight issue. Most rafters are only 2"x6"'s If you add another layer of shingles on top of the old ones, you can get too much weight and bow the rafters. Best way is tear off, replace any damaged sheeting, re-felt, replace any flashing and dripedge and re-shingle. imho

OldNBroken 01-19-2012 09:15 PM

Quote:

Originally Posted by gopher59 (Post 828425)
You must consider the weight issue. Most rafters are only 2"x6"'s If you add another layer of shingles on top of the old ones, you can get too much weight and bow the rafters. Best way is tear off, replace any damaged sheeting, re-felt, replace any flashing and dripedge and re-shingle. imho

Of course that is the best way...doesn't mean it's the only way. OP wasn't asking that, OP was asking about the viability of doing a recover.

joecaption 01-19-2012 09:19 PM

And what could happen if they did.
So the other posters are spot on.

bobsalas 01-19-2012 09:27 PM

Wow

That was fast. Thanks a lot.

Slyfox 01-20-2012 06:15 AM

Lay-overs installed properly will look as good and last as long.

I have done multiple lay-overs that are already over 20 years old and are still intact.

1. You have to inspect & address issues in the existing roof.
(flashing, sheathing, ventilation, etc.)
2.You have to prep the existing roof, which requires a half dozen steps or so.

If done properly, you'll have no problems.

gopher59 01-20-2012 07:32 AM

Joe is right! Before I had my roof redone, I climbed in the attic myself and checked all the sheeting, and rafters so I would know what needed to be done before the roofers showed up. They are just trying to make a living in hard times, you have to stay on your toes. Don't let them get by without replacing the wood if it needs it, sheeting is less than 10.00 per sheet. It's not worth it in the long run and if the roof is leaking, definitely check the rafters , cause sometimes they can be rotting as well from water damage and you may need to sister a few. Some roofers will try and cut corners and not do it unless it is so bad you are falling thru, don't let them do it. Mine tried it (and yes they will lie to ya) but I already knew what needed replacing and I made them do it. They won't charge you that much more if they want the job. It's not hard to do at that stage. Good luck2!

MJW 01-20-2012 10:11 AM

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?

MJW 01-20-2012 10:13 AM

Quote:

Originally Posted by gopher59 (Post 828669)
Joe is right! Before I had my roof redone, I climbed in the attic myself and checked all the sheeting, and rafters so I would know what needed to be done before the roofers showed up. They are just trying to make a living in hard times, you have to stay on your toes. Don't let them get by without replacing the wood if it needs it, sheeting is less than 10.00 per sheet. It's not worth it in the long run and if the roof is leaking, definitely check the rafters , cause sometimes they can be rotting as well from water damage and you may need to sister a few. Some roofers will try and cut corners and not do it unless it is so bad you are falling thru, don't let them do it. Mine tried it (and yes they will lie to ya) but I already knew what needed replacing and I made them do it. They won't charge you that much more if they want the job. It's not hard to do at that stage. Good luck2!


Why not inform your contractor about that while he is making the estimate. That would be the honorable thing to do rather than try to "set a trap".

OldNBroken 01-20-2012 11:16 AM

Darn, that "thank" button only works once. :laughing: :laughing: :laughing:

Roofmaster417 01-20-2012 12:26 PM

Quote:

Originally Posted by gopher59 (Post 828669)
sheeting is less than 10.00 per sheet..,.,They won't charge you that much more if they want the job.

I don't care if its President Obama I charge $55 per sheet up to a 1/2".I have roofed both of my parents houses.My dad had decking replaced @ $4.00 per foot and mom was charged $55.

That is what is wrong with the construction industry from both sides of the fence.Trickery.

Tom Struble 01-20-2012 12:56 PM

you charged your Mom?:huh:


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