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Roof "hog valley" leak problem

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Roof "hog valley" leak problem jj3000 02-15-2005
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Posted by jj3000 on February 15, 2005, 4:19 pm


My home has a valley where a roof joint another roof and it is a V
shape, I believe it is called a hog valley.

From the center of the valley there are no roof tiles for about 1 foot
in both directions.

The problem is that this area holds standing water and I'm having
trouble with some water leaking into the attic and studs in one
particular spot. I had a roofer came and he had coated it with what
looks like some tar and then a silver aluminum colored paint/coating.

It's been raining and that spot is wet again. I think the roof guy
will warranty his work but I might have to find a way to fix it myself
because I'm in CA and it doesn't rain very often. My roof is about 8
years old and it's got a layer of old roof below it already. It could
be leaking down from some other spot but I would think it's likely the
valley..

Any advice is appreciated.


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Posted by John B on February 15, 2005, 6:01 pm


Yes. You have a tough one. That's because you have two layers. But your
"outer" roof is still young.
The leak is higher than your roofer suspected; I know that because he didn't
fix the problem. Maybe you didn't tell him that you have two roofs.
The wet spot you see is a consequence of the OLD leak in the UNDERLYING
roof. IOW, the new roof is leaking at a higher eleveation, and the water
runs between the layers, only to percolate through the aforementioned old
leak.
Why do roofs leak? Sometimes because heavy feet damage the membrane. So
suspect the pathway commonly, and casually, used on the roof. But on a roof
so new as yours, look for outright tears and cracks. And don't forget to
inspect flashing and the caulk that may be required. Is there a chimney in
the mix, here?
If you want to fix a leak, you must "think like water."
And look beyond "hog valley." The water is running to the valley, after
entering in a place you least suspect.

> It's been raining and that spot is wet again. I think the roof guy
> will warranty his work but I might have to find a way to fix it myself
> because I'm in CA and it doesn't rain very often. My roof is about 8
> years old and it's got a layer of old roof below it already. It could
> be leaking down from some other spot but I would think it's likely the
> valley..
>
> Any advice is appreciated.




Posted by jj3000 on February 15, 2005, 9:24 pm


Thanks for the advice, I'm going to fill the valley up when it's dry
to make sure it is NOT the valley's fault first.

However we are going to have rain this whole week.. how can I minimize
the amount of water getting into the house? Perhaps a big tarp?

> Yes. You have a tough one. That's because you have two layers. But your
> "outer" roof is still young.
> The leak is higher than your roofer suspected; I know that because he didn't
> fix the problem. Maybe you didn't tell him that you have two roofs.
> The wet spot you see is a consequence of the OLD leak in the UNDERLYING
> roof. IOW, the new roof is leaking at a higher eleveation, and the water
> runs between the layers, only to percolate through the aforementioned old
> leak.
> Why do roofs leak? Sometimes because heavy feet damage the membrane. So
> suspect the pathway commonly, and casually, used on the roof. But on a roof
> so new as yours, look for outright tears and cracks. And don't forget to
> inspect flashing and the caulk that may be required. Is there a chimney in
> the mix, here?
> If you want to fix a leak, you must "think like water."
> And look beyond "hog valley." The water is running to the valley, after
> entering in a place you least suspect.
>
> > It's been raining and that spot is wet again. I think the roof guy
> > will warranty his work but I might have to find a way to fix it myself
> > because I'm in CA and it doesn't rain very often. My roof is about 8
> > years old and it's got a layer of old roof below it already. It could
> > be leaking down from some other spot but I would think it's likely the
> > valley..
> >
> > Any advice is appreciated.


Posted by John B on February 15, 2005, 10:15 pm


Yeah, you can do that. But you have to tarp from the bottom to the top; the
entire watershed. Layer it, and fasten it somehow to preclude wind damage.
If your house has no parapet with drain holes (like a commercial building)
then there is less threat of catastrophic roof collapse, in the event that a
tarp manages to obstruct drainage holes. I have not seen a picture of your
roof, so you'll have to evaluate any such threat yourself.
Painter's tarp, as comes in a big roll, either 9' or 12' wide, is one way to
go. Sunlight will disintegrate the plastic if you leave it up there for
three months or so.
> However we are going to have rain this whole week.. how can I minimize
> the amount of water getting into the house? Perhaps a big tarp?
>




Posted by Goedjn on February 15, 2005, 9:07 pm



>It's been raining and that spot is wet again. I think the roof guy
>will warranty his work but I might have to find a way to fix it myself
>because I'm in CA and it doesn't rain very often. My roof is about 8
>years old and it's got a layer of old roof below it already. It could
>be leaking down from some other spot but I would think it's likely the
>valley..
>
>Any advice is appreciated.

Wait until everything dries, and ppour a bucket of water
into the valley. If it ends up inside, then that's where the leak is.

Drill a 4" hole in the lowest part of that valley, and install
an internal drainpipe. This is why only people with more
"artistic" sense than common sense build roofs that way.



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