I’m putting a new roof on for my dad using asphalt shingles. It’s been awhile since I’ve done this kind of work, and this particular roof has four valleys. I’ve done a few roofs in my time but never dealt with valleys before. The current roof (over 20 years old) uses galvanized valleys. Do I keep these valleys, replace them, or remove them, and weave in the shingles to make the valleys? I’m concerned that if I use the metal, that there will be times there won’t be enough shingle material where it meets the valleys. Opinions?
Also, I’ve noticed that some builders (here in CA) wrap the shingles down over the rake. What’s that about? wind I guess. I had lived in New England for over 30 yrs. and never seen this technique.
Thanks in advance for the input.
David
Replies
Rolling them over the rake sounds just plain sloppy to me but I've never worked roofs that far west.
Whether to replace your valley metal depends on conditions. Most often needs replacement. Or you could leave it there for support and then weave or lap the valley over it.
There was a good article in FHB last year,
http://www.taunton.com/finehomebuilding/pages/hvt037.asp
Excellence is its own reward!
The valley has a ridge in the middle so you can't shingle over it.
I have to say that the shingle/rake deal looks a little odd to me, plus the leading edge of the shingle on the rake side is nailed - exposed and looks sloppy.
That would be a "W" style diverter valley, usually used where theree are two different slopes or with more high end jobs like shakes, slate, asbestos, etc.
If it is copper or tinned with no rust and no nail hiles penetrating it, I would be temted to re-use it. Might want to take it up carefully and lay ice and water shield under it for a backup liner and then re-install it.
but it could have been installed by a hack and have lots of nail holes and is worthless.
Excellence is its own reward!
I think when he says " roll them over the rake" he's seeing fake thatch.
In an asphalt shingle?.
Excellence is its own reward!
I see a few houses here that did that....Ones a restaurant on the water called "The Thatched Cottage".
It doesn't look sloppy at all....kinda interesting actually.
Not my taste, but it looks like they had to do some weird framing or something to get that look. And yeh, its asphalt and they've been there a long time.
Be well
andyTrue compassion arises out of the plane of consciousness where I "am" you.
http://CLIFFORDRENOVATIONS.COM
Hmmmm,
Now that I'm thinking about it....when I do the valleys on my house when doing my wood roof, I think I just may interweave (like corners on a wood shingle house) the shingles ontop of the copper valley.....or isnt that possibe.....nail holes? Ya have to admit thats a good question though.
Be well
andyWe're being trained through our incarnations-trained to seek love, trained to seek light,trained to see the grace in suffering
http://CLIFFORDRENOVATIONS.COM
Yeah - I've seen asphalt applied over cedar.
If you don't smoke pot then you must simply be a competitor for the position of village idiot. Gabe
Your picture shows rolled over the eave, while dave was talking rolled over the rake edge.
I do like the look of what you showed, for certain kinds of house styule. but wonder if it holds shape through years of heat and ice..
Excellence is its own reward!
Dave, I read your original post again. It looks to me like you might be misusing the term Weave for the valley. Your concern is whether there is enough shingle material to reach in over the metal.
what you need to do is when you have a three foot long shingle for a position where a four foot long one is needed for coverage, you cut and lay a one foot piece fist - back away from the valley, then lead the full size shigle out over the valley. If you laid the 3' first and then the 1', you would have to place nails in the vaklley, which is a mortal shingle laying sin.
Or, you do a layout that has you stairstepping the pattern into the valley first and laying away from it. This works better with some kinds of shingle than others which is a reason SteveH wanted more info..
Excellence is its own reward!
Sorry I didn't respond sooner... had to tke care of somethings.
Here's a couple of pics.
From what I can see of that valley, you need to take it up and unless it is in pristine condition, have more made to replace it. You need to lay new tarpaper overall and run new valley liner before re-installing the valley.
thanks for the shot of the rolled over rake. Looks like they are trying to emulate Spanish Tile..
Excellence is its own reward!
Here's another pic on the same house.
If you don't smoke pot then you must simply be a competitor for the position of village idiot. Gabe
ooops
Dave,
The houses around here that have that somehow roll the bottom of the shingles around like a thatched look.
Looks more solid and I know holds its shape because they've been here that way a really long time.
The house in your pictures appears to me to be a very fragile way to leave a roof with no support.
BE well
andyWe're being trained through our incarnations-trained to seek love, trained to seek light,trained to see the grace in suffering
http://CLIFFORDRENOVATIONS.COM
The house in the pictures is ready for a new roof. I submitted a proposal ro remove the asphalt and underlaying cedar shingles back to the split sheathing and install new cedar. Every thing is well supported, although the two layers of asphalt give it a puffy look.
I am not a fan of weaving valleys.
Double cut over galvanized looks cool but single cut overlap is superior IMO.
First, I like to use a 3' roll of roofing to flash the valleys, shingle the short roof through the valley and cut the long roof at valley center. Keep all nails a foot or so away from valley center and use tar discreetly. Caulking gun tar is excellent for this purpose.
The long roof would be the section where most of the water comes from due to size, weather patterns, etc.
Turtleneck
Dave-----if you give a few more clues as to what style the house is,what pitch the roof, and what shingle you are planning on using and weather you are planning a tear-off or an overlay we can give you better pointers.
so far your question is like asking what's the best car?--best for what---price,comfort ,handling,durability-----?