I have a leak in a valley on my cement tile roof(flat interlocking). I
climbed up to investigate and noticed that there was a channel in the
valley (approx. 4" wide). I lifted a loose tile and noticed that the
felt paper around the channel was very deteriorated. It would crumble
when touch in the hand. I want to do the repair myself. I just need
some clarification on a couple of things. Here is what I plan to do
and tell me if it is correct.
I'm going to:
1. Remove the tile on each side of the channel from the top to the
bottom. I'll go as wide as I need to until the felt looks good and go
2. I'll remove the old channel. It looks like it is in good condition.
If I can reuse it I will.
3. I'll remove the deteriorated portion of the felt.
4. I'm not sure but, there is probably some type of nail board that
the tile gets nailed to. If I need to, I'll remove them to.
5. I'll repaper the valley going across from to to bottom overlapping
6. I replace or reinstall the channel.
7. Replace the nail boards (If I removed them.)
8. Reinstall the cement tile. Replacing any broken ones.
I'm I off base on this. Please guide me in he right direction.
Thanks in advance
PS the channel is about 10'-12' long.
firstname.lastname@example.org (m Ransley) wrote in message
When I went into the attic, I could see staining on one side of the
valley. I hope this is were the leak is because I re-did everything
on this one side of the valley. It was about 100 square feet. Yes,
the paper within 3 feet of the valley was crap. Now I'll just sit and
wait to see if the side I fixed leaks. If its the other side, I'm not
sure were to or how to stop without doinr the whole thing.
thanks for the help.
On 12 Nov 2004 16:07:38 -0800, suarez email@example.com (Kevin) wrote:
I've repaired my 80-year-old concrete tile roof several times myself,
on the apron roof sections, but when it started leaking three stories
up I called in the pros!
They removed and stacked all the tiles to one side, replaced the wood
underlayment wherever it was rotten, and put down peel-and-stick type
ice and water membrane against the wood. If memory serves, they then
put down regular felt over that, replaced the wooden tile hanger
strips (most of the originals were rotted away) and then relaid the
If your roof still leaks around the valley, you might try the
The copper sheets used in the valleys on my roof are around twice as
wide as on a normal asphalt roof, maybe more, and have a 1 1/2" ridge
standing up in the middle of the valley. This ridge directs the water
into the valley and keeps it from flowing under the tiles on the other
side of the valley, as well as providing a barrier for the row of
tiles next to the valley to rest against.
I once had a guy replace two small valleys on the apron roof who used
just regular width copper ( 18" I think) and didn't provide the little
ridge. He also used regular roofing felt.
The valleys just didn't work at all like they were supposed to and
when they got clogged with leaves, the roof leaked because the water
spread under the adjoining tiles and flowed under the valley. When the
felt got soaked, the water came through the wood underlayment and into
I don't know if all concrete tile roof valleys are made like mine, but
if they are, you need that little ridge and the extra wide copper
flashing under the tiles.
You're right to do the entire valley. You may also want to lap the valley
channel (metal?) UNDER the adjacent underlayment. Also go under with any felt
you fill in. Good luck. Tom
Work at your leisure!
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