Need some thought on roof tie in

lzicc · Jul 18, 2018

I am putting an addition on and ran into an issue with the front valley. If you look at the picture, the valley from the new roof to the old roof doesn't end at the corner of both roofs. It's hard to explain. What I need to do is extend the overhang for the 2 roofs to meet level, but the overhang would be 34" which is too long for an overhang. The issue is how I am going to run a gutter to the valley the way it sits now. I am going to try to take some better pictures.

lzicc · Jul 18, 2018

This is a picture from the top of the roof. Where you see that strip of shingle on the paper, that is how the valley goes.

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747driver · Jul 18, 2018

I will give it a stab ! I am assuming you want to tie into the existing gutter and run a extension to the corner of the new addition ? Go ahead and make that overhang off the existing roof ( 12 inches ? ) the same size as all the overhangs to make it look right from the ground, then run the existing roof over to the new roof to make a new valley. You will have to make the fascia taller so you can run a short piece of gutter on the new addition corner where the new valley would end up. Best I can think of....when I do roofs I always visualize which way the water will run and build accordingly. Good Luck !

EddieWalker · Jul 18, 2018

Why not extend the existing roof out over the new roof and create a new valley?

lzicc · Jul 19, 2018

I thought about just extending the valley somehow, just not sure how. If I extend the overhang, it will be about 34" out. I think 24" is max, after that, it could sag or not hold the snow load I'm guessing.

lzicc · Jul 19, 2018

I thought about putting a conductor head at that valley. Just not sure how bad that would look.

GLyford · Jul 19, 2018

I think I would run the gutter around the corner past the valley. Then on the outside edge, add a piece of flashing that sticks up 6 or 8" so that the bigger flow coming down the valley doesn't overshoot the gutter.

If your are going to put the downspout right there anyway, the conductor head looks like a very good option, and might not need to have a flange of flashing sticking up if it is installed so that the line of water coming off the valley hits the far edge rather than going over it.

The bigger issue I see with extending the roof to 34" isn't support...you could always add a knee brace or something to support it. No, being in PA I think a large roof overhang like that is going to give you a cold section of roof right where all the snowmelt will be coming down. It will hit the colder roof section and freeze and be a constant source of ice dams. Yeah, you could always run heat tape, but I think I'd rather have the shorter roof and then create some form of funky looking gutter. Beats patching roofs and walls from water damage later.

lzicc · Jul 19, 2018

I agree GLyford, plus the extended overhang may not look right either.

M5farms · Jul 19, 2018

Thats tricky but a deflector flashing and conductor head is your only logical choice at this point. I see these kind of things all the time even high dollar architects can not understand the concept of getting water off a roof in a simple design. Use a ice and water peel and stick in the valley also .