jackson713

Mon Aug 22, 2005 12:59 am

I woundering if it is ok to use architectural shingles on a valley because i am getting a few leaks in valley area on a few houses that I work on. All the leaks are on woven valleys or over layed then cute on one side is the way they do them. The water is going under the shingles and over the metal valley then into the house in several different ways depending on where the water enters at. Is there a site that tells what your supose to do in these types of valley and if so where.

QRFL

Mon Aug 22, 2005 1:12 am

re-do it : valleys with proper underlayment or ice and water shield under a good shingle installation should not leak. if you weave dimensional shingles you shouldnt need metal. unless you have the heavy duty dimensionals.

if there is only rain and water is getting in,, valleys are shingled wrong.

SYS

Mon Aug 22, 2005 1:24 am

Architectural valley's per manufacuter spec are not woven at all. The bottom shingle's are laced like they are on a 3 tab vally but then you run the undercourse lay a shingle in a diagnol fashion up the valley and nail it in the over course doesn't get cut the same as a 3 tab valley it is supposed to be cut straight where the bottom corner meets the edge of the diagnol shingle. Not to sure if this makes sense to you you may want to see a picture of it in order to better understand. You can see an example of it on any of the material manufacturer sites. [img]http://www.geocities.com/bergerroofing/pages/Homestead3_jpg.htm[/img] Here is a pic of how it goes but it's not the best if you look right above the shingle that this roofer is working on. Where the hosese come to a T you will see the diagonal shingle. The material manufacturer will not warranty an arc roof if the valleys are not shingled this way.

Master

Mon Aug 22, 2005 12:53 pm

If you buy a bundle of shingles, it has the valley instructions on the back. DO it to their specs and you should be OK.

jackson713

Tue Aug 30, 2005 1:49 am

I have looked at the specs on the shingles and they do tell you what needs to be done but not really how it is to be done. The shingle tthey use are 30 yr and there so thick that they have voids. I'm guessing the only thing their doing wrong is not putting weather shield under like it tells you to do on the shingle packages. Their also having alot of stone debris getting under the shingles down in these pockets I guess you call them. This opens the way for the water to get in.

Master

Tue Aug 30, 2005 1:51 am

Remember that shingle roofs only shed water, and are not a sealed system.

affrdblrfng

Tue Aug 30, 2005 3:15 am

You might not be shinlging the right side first. For instance the side that is going to shed the least amount of water (for lack of better words)

SYS

Tue Aug 30, 2005 5:32 am

can ya post a picture of the valley? This would help out alot. Here are a few things to think about though first did you cut back the ears? Let em expalin what I mean just in case you don't understand the term. The overcourse gets cut diagnolly down the valley when this happens there is a corner left at the top of each shingle. You have to cut the little corner off the top of the shingle and make it square, put your pointer finger and middle finger togather, that's as much as you need to cut. This will cause a leaky valley. Are your nails at least 6 inches away from the valley? When you cut the valley back did you cut it back far enough? All real simple things but all could cause big problems. Either way will you still post a pic one of the experts around here will find the problem I'm sure.

Master

Tue Aug 30, 2005 11:15 am

I agree with sys....post a pic and we might be able to help...

There is a term forthe practice of cutting the ears off the overcourse in the valley, it is called dubbing. Thats what we call it anyways, and is what you all shall call it from now on.

Like she said...be sure to dub the overcourse and stay 12" out of the valley centerline when nailing.

TrueDirt13

Tue Aug 30, 2005 3:06 pm

And that is what we shall call it. Handed straight down from the man upstairs to Master then on to us.. Definitive.. Heh heh..

SYS

Tue Aug 30, 2005 4:39 pm

The material manufacturers call it cutting back the ears so I will stick with that.

Material manufacturer spec also says to keep the nails 6

SYS

Tue Aug 30, 2005 5:05 pm

Ohhhh I know who I forgot and I know why too. lol IKO's
Sorry I don't really count those cause they are dollar store worthy.

Master

Tue Aug 30, 2005 10:12 pm

My Jedi Powers are only half working.

SYS

Wed Aug 31, 2005 12:22 am

lol use the force young jedi

SYS

Wed Aug 31, 2005 12:34 am

Another thing about the valley I just thought about did you run under course shingle far enough into the valley? I go a tab and a half or more that's about 18 to 24 inches.