Dormer valleys

does anyone have some pics they can post of an open metal valley on a dormer? I am having some disagreement with how much metal to show where it exits onto the main roof. i.e. do you cut it to the valley or leave the end square? How much metal to show over top of main roof shingle the valley dumps onto?

I have always run 1 finger length over the end of the valley or you could cut the side the valley hits the drip edge and hem it underneath it.

I run it until the outer edges rear the bottom of the starter. Then, I cut it back a bit, and square it across. I think I average 4" out. Never cut them too close. I couldn’t count the ones I’ve been on that leaked from being too close.

Sorry, but no pix.

The more the merrier. To me it all depends on the poisition of the last shingle on the main. Not everyone is exactly the same.

Run it down till the outer corner of the valley flashing hits the bottom of the starter of the dormer. Then cut it along the starter, and 90 degrees across the main field.

As far as how much to show, it depends on where your last field shingle lands.

Generally I try to expose as little as possible, flashing sticking out here and there is U.G.L.Y

http://www.roofing.com/images/topics/8963/img_1263996869.jpg I useually bring the metal to where ever the valley runner goes to,and if other side is off roof like this one i wrap it…

perhaps this was a bit much, but it made me comfortable. Kage, I can’t stop with the open california valley method, its fast and its clean.http://www.roofing.com/images/topics/8963/img_1264112278.jpg

And just to clarify that is NOT a plastic pipe boot. Its alum painted black :mrgreen:

That’s fine.
The problems may come when the fascia and soffit go up. There is no way to get a step flashing in behind the fascia, unless you go back and flash when they run it.
The carpenter will run his stuff tight, the gutter man will do the same.
The water will end up in the soffit and sometimes in the wall.
Retrofit can be a bear.

[quote=“tinner666”]That’s fine.
The problems may come when the fascia and soffit go up. There is no way to get a step flashing in behind the fascia, unless you go back and flash when they run it.
The carpenter will run his stuff tight, the gutter man will do the same.
The water will end up in the soffit and sometimes in the wall.
Retrofit can be a bear.[/quote]

The good news is I am doing the siding. I will leave it off the roof 3/4". I’m not quite sure I follow you though. The step flash runs up the dormer sidewall as far as I could get it. what do you mean by flashing the fascia?

Steps always go behind the fascia like any other wall.
I have a pic, but can’t seem to upload it.
But, Steps always go behind the fascia like any other wall. They keep the water out of the soffit.

Send an e-mail if you want for a pic.

http://www.roofing.com/images/topics/8963/img_1264119117.jpg

Went this time.

http://www.roofing.com/images/topics/8963/img_1264119117.jpg

[quote=“tinner666”]Steps always go behind the fascia like any other wall.
I have a pic, but can’t seem to upload it.
But, Steps always go behind the fascia like any other wall. They keep the water out of the soffit.

Send an e-mail if you want for a pic.[/quote]

Also keeps the fascia from rotting if it’s to close to the roof

Wow I’ve never seen anyone do that before. Makes sense. I guess I feel like it would take some seriously magic water to get in there.

That’s exactly what I do. I bend that last piece of flashing right up over the eave of the dormer and then put the drip on.

I have been thinking about this a lot in the past hour. I have definitely step flashed fascias before, but not in this particular application. It seems like the valley covers so much of it, and the overhang is like 8 inches, I don’t see how water can really get in there. If it were a shed roof that would be different because you don’t have the valley cover.

Blown rain. Leaf diverted water. Other issues cause water to get into the soffit right there and travel to the wall and into the house.
The fella that recently posted about a leak here, and had a dead valley in the corner, also had one of these around the corner, unphotographed,a nd un mentioned. It may well have been the cause of his leak.

http://www.roofing.com/images/topics/8963/img_1264136801.jpghttp://www.roofing.com/images/topics/8963/img_1264136865.jpg
The first valley i wrap the ends around starter,not all the way though i leave it bent towards gutter,the second one is with the step before the facia and gutter.

Don’t forget about ice at the bottom of that valley Shangle.