Roofing over old roof

Posted by red on November 23, 2006, 2:24 pm

Joseph Meehan wrote:
Generally I would say you can roof over one layer of roofing if it is

> flat and in generally good condition. If it is curling or starting to fall
> apart I suggest taking it off.
> Stripping it all also gives you a chance to evaluate the condition of
> the deck as well.
> --
> Joseph Meehan
> Dia 's Muire duit

Lots of the granules are off the shingles, and the shingles at the
bottom edge are pretty curled down, otherwise, it seems pretty flat.
Maybe I'll try to take a pix and post if the weather ever drys out
here.

The shed roof was roll roofing and was perfectly flat and in excellent
shape when we re-roofed. And since a couple of roofers had told me it
was ok on that roof to go over the existing shingles, I didn't question
it on that job.

Posted by Buck Turgidson on November 23, 2006, 3:08 pm

In my county, you can have up to 2 layers of shingles according to code.

You should check your local building codes to make sure that 2 is allowable.

Posted by Tom The Great on November 24, 2006, 12:35 pm

>I am probably obsessing over this, but if I do decide to roof the
>back-half of my existing roof, what criteria do I use to decide whether
>I can roof over the existing shingles or not?

IMHO:

Most limiting factor, check your local codes. Some juridictions do
not want fire fodder too thick on your roofing.

Then have a roofer/engineer check your attic for proper support. A
roof does weight a lot. ;)

Just my guesses.....

tom @ www.FindMeShelter.com

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Roofing over old roof - Page 2