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JamesPatrick

01:10PM | 06/09/05
Member Since: 02/26/01
35 lifetime posts
Bvplumbing
I’m remodeling my bathroom and taking advantage of the open walls to replace the supply and DWV lines in that part of my 70 year old house. My neighbor had all of his plumbing replaced a few years ago and the plumber went all the way to the roof with the new vent line. My roof is slate with a number of years of useful life left and I would rather not replace the stack that far and risk causing a leak in the temperamental roof. My preference is to add new line only from the point where the drain line enters (about 4’ below the roof) and downward from there (using a no-fitting), thus not disturbing anything within a few feet of the roof. My simple mind tells me this should be fine. Are there any potential problems that I am missing?

RayVinZant

05:00AM | 06/15/05
Member Since: 08/29/04
227 lifetime posts
I would do the same thing. The only thing I would make sure I do, is to bolt the pipe rigidly before I cut it. Most plumbers typically use either a riser clamp or metal band iron (this is thin metal 1/2" wide about 16 ga with holes in it). The riser clamp is the best because its very rigid support. The band iron, can be bolted to the pipe with 1/4" or 3/8 inch bolts and nuts right through the holes. You unrole about 3' of band iron and cut it with snips, do that twice. Then in the middle of the band iron set it aginst the pipe on both sides. Wrap it till each piece of band iron is touching, leaving about 1' on each side. Then bolt the two pieces of band iron together on each side of the pipe. Make sure to clamp it so the bolts sinch the band iron tight against the pipe like a clamp. You should have four 1' ears extending away from the pipe. Make them all 90 degrees apart and screw them with lags to the beams in the roof. Do this at two different locations and the pipe will be rigid when you cut it.

Good Luck

Raymond VinZant Plumbing Prof.
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