Flashing, vinyl siding onto concrete
Hi all, new to the site and expect to show up often as I try to do as much as possible in regards to home repair as I can. I recently had a stamped concrete patio poured at the rear of my house. It is actually poured to about 4″ below my sliding patio door, which means it is actually poured against the rim joist of the house. Before the patio was poured I installed 2 layers of ice & water dam between the patio and the rim joist, it extends about 10″ up under the vinyl siding. I did not re-attach the vinyl siding yet and was planning on putting some aluminum L flashing under the first row vinyl so any water running down the siding will be encouraged to run onto the concrete slab rather than run down the siding then in between the concrete and ice and water dam. I will be bending my own aluminum, and was wondering how far up the wall should the flashing run and also how far out onto the concrete pad should the flashing run to promote water runoff? Thanks in advance!
Replies
Hi, Royal. Welcome to Breaktime. If I might suggest you take a few moments to fill in your profile; it can help people answer questions if they know where you're located.
Well, first of all, one must hope the patio slopes away from the house. If it doesn't do that (¼" in 10 feet is the usual slope for a deck or patio) it won't matter how far out on to the concrete your flashing runs.
But let's think positively. Assuming the slab slopes properly, if your flashing kicks the wall's drainage plane an inch or an inch-and-a-half out over the slab, you should be okay.
On the wall: the ice and water membrane should be glued to the sheathing up beyond the top of the last course of siding. On top of that, and extending above it, goes your flashing. It would be a good detail to run a bead of pitch or roofing cement under the top edge of the flashing (make sure to use a product which is compatible with the I&W membrane). Finally, on top of the flashing, coming down from above, goes the existing felt or housewrap.
Dinosaur
How now, Mighty Sauron, that thou art not brought
low by this? For thine evil pales before that which
foolish men call Justice....
Thanks dinosaur, the pad has a pretty steep pitch, it is atleast a 1/4" per foot. In regards to the flashing, let me try and get this straight, if you're down the front of the vinyl to the patio, the flashing should stick out an inch past the vinyl onto the slab? Which would mean the bottom of the "L" bend would be 2" or so, long enough to make up for the profile if the vinyl? Or do you mean, make the bottom bend an inch, then when the siding is put back on you wouldn't hardly see the flashing sticking out?
Also, when they built our house 20 years ago they used no house wrap or felt, it's vinyl right over particle board, which is another story and led us to a new sleding patio door and tearing out the old deck which was attached to the rim joist with NO FLASHING what so ever, no back flashing or drip flashing. They just cut the vinyl and nailed the ledger to the rim joist, you can only imagine the decay we had, it was VERY hard work getting rid of all the decay. Neighbor said he remembers that it was the homeowners project and not professionally done.
I'm going to try and include a picture of the patio to possibly show the pitch, and a test piece of flashing that I bent up.
Edited 9/14/2008 8:51 am ET by royals88hockey
Here are a couple of pics, notice how the finished flashing would stick out 3/4" of an inch or so below the vinyl and onto the pad, is that what I'm looking for?
Royal--A fair number of us are on dial up (including me). We can't possibly open photo attachments that big.
If you could resize those pix down to 450x337 pixels and reduce the resolution to 72dpi, they'll come in at about 45kb or so.
Or, if somebody else on high-speed could re-size those...?
Dinosaur
How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....
Here are some resized pics using irfan, thanks.
Thanks, but that's still a 15-minute download for me. Try converting them to jpg images. Bitmaps eat up a lotta bytes.
Dinosaur
How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....
How's this, resized and in jpeg, I hope? Yes it is from irfan, thanks for the link.
There ya go! Perfect....
View Image
Yeah, that looks fine. One detail I would add is to put a 'hem' on the bottom of the flashing.
Dinosaur
How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....
Personallly, I wouldn't use a flashing that laid on top of the slab.
I'd use a sealant to cover the expansion joint, like a thick, pourable caulk.
Are'nt you then at the mercy of the caulk? We all know how they don't last, thought flashing would be more long term, no? Also, in this case, there is about a 3/4" gap between the bottom of the siding and the pad where you can see the ice and water paper.
Edited 9/14/2008 9:12 am ET by royals88hockey
Flash it like Dinasauer told you>G<
Properly detailed & specified (which means in practice using backer rod and commercial grade sealants) caulking is fine, and might look better than tin on the deck....
Which would mean the bottom of the "L" bend would be 2" or so, long enough to make up for the profile if the vinyl? Or do you mean, make the bottom bend an inch, then when the siding is put back on you wouldn't hardly see the flashing sticking out?
You want the flashing to project a bit beyond the plane of the siding. Typically with vinyl we make it about an inch or a tad less.
, when they built our house 20 years ago they used no house wrap or felt, it's vinyl right over particle board,
This would be a good time to remedy that for the wall you're already working on. At the least, pull a few more courses of the vinyl and lay on one course of 15# felt overlapping the flashing and the I&W membrane.
old deck which was attached to the rim joist with NO FLASHING what so ever, no back flashing or drip flashing. They just cut the vinyl and nailed the ledger to the rim joist, you can only imagine the decay we had,
Wrong. I don't have to imagine it; I see that all the time. Too many people seem to regard decks as idiot-easy to build...and what you describe is a fairly typical result of that misconception.
Dinosaur
How now, Mighty Sauron, that thou art not broughtlow by this? For thine evil pales before that whichfoolish men call Justice....