Shingles Installed over old shingles

[RussDaBuss]

Hello All,

I have a question. We have a smaller Cabin and i need to put new shingles on it. Can I install the new shingles right over the existing ones? We are planning on remodeling with in 10 years so then the whole roof will get redone. As for a quik easy install is it all right to leave the old ones on and go over with the new? If so, anything special I should do? I assume no tar paper?? Long nails i would think??

Thanks

[Outfitter17]

If I were you I would go with metal roofing, it will go right over the old shingles with no problems.

I have never heard of laying another layer of shingles over old ones?

[walleyeseeker]

Under Minnesota code, you can not shingle over shingles. Every brand of shingle I've worked with also states that shingling over shingles will void the warranty.

[RussDaBuss]

Ya, I was not sure. A few people have mentioned to me to possibly do this for a quik fix for a few years BUT I have no experiance with it either.

Thanks

[Outfitter17]

We put metal roofing over rolled roofing and it works great.

[tweedlap]

It used to be a fairly common practice. You can figure about a 10 year max life out of them.

I have them on my house right now and this fall they will be replaced. 10 years. I did it for a quick fix but ended up staying here longer than I had planned.

Not fun tearing off a double layer !

tweed.

[Roofer]

It will be easier to tear it off now, and tear it off again during the remodel, than it will be to pull two layers.

The code for no two layers is only in the hail zone. I have the counties listed, but I don't want to list them all.

As for the metal. It leaks, trust me, you just don't know it yet. It's a quick fix, but not a long term thing, unless it is just a simple two slope cabin that is rarely used. It will either leak or sweat eventually. I have a finished pole barn and I cringe when it rains because I know sooner or later I'll be ripping it all off and recycling it. Then I can put a real roof on.

[sparcebag]

Its only not code if your area has accepted new codes and lots of minn. isnt under current new codes but there is most likly a code of some type from the county.So it depends where you are.

It was just a few years ago a 2nd layer was accepted but not a third because of weight.Check county codes and if its OK, go for it.There should'nt be much problem for your short time,I have seen go overs last as long as new installs,

[BobT]

I have never been in favor of that practice. First, it adds too much soft cushion under your top layer. When hail hits it, it has a better chance of doing damage. When you walk on it, the shingles will flex too much and this too can cause issues. I've also heard that even though you use longer nails or staples, they are just not as secure and wind damage is more probable. It might be a quick fix but wait until the day you have to hire a contractor to remove a double layer. The cost can be considerably higher and as already mentioned, you won't save in the long run because the life expectency will drop a lot.

Bob

[RussDaBuss]

Thanks for the info guys!! I will most likely do it the right way and be down with it!!