My son had a sink that went glug glug when the toilet in the same room was flushed. we looked in attic- the vent line was a 1 1/2 (I think) pvc line that ran a long way horizontally across the attic floor with sags in it, to the back of the house before turning 90 degrees up and hooking into its own vent line that went thru the roof.
he has straightened out the long horizontal line (hearing water pour out of it hopefully opening up the vent now).
The problem he says is that the long horizontal line is now on an up angle where it gets to the vertical roof vent line, and of course its not at 90 degrees anymore.
and idea if there is any type flex made to solve this connection to the vertical vent line?
Replies
What angle? If it's not much you can heat and bend the pvc a little.
You can get that necessary small angle using two 45° or, better yet, 22.5° elbows one after the other.
First off, he should be aware that there are 90-degree elbows and not-quite-90-degree elbows. The not-quite-90s are designed to transition between a vertical line and a properly sloped "horizontal" line.
Next, with application of plenty of glue and a bit of working the fitting back and forth while gluing it's possible to fudge a few degrees out of it.
Failing that, go with the 90 and a Fernco-style rubber connector.
"First off, he should be aware that there are 90-degree elbows and not-quite-90-degree elbows. The not-quite-90s are designed to transition between a vertical line and a properly sloped "horizontal" line."
Do you happen to know what those are called?
Jon Blakemore RappahannockINC.com Fredericksburg, VA
Nope.
The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness. -John Kenneth Galbraith
If it hasn't got a name, it doesn't exist!
Seriously, I've never heard nor seen of said item......inquiring minds want to know more
A 90 followed by a 22.5..
William the Geezer, the sequel to Billy the Kid - Shoe
But isn't the angle closer to 1.2°?
Jon Blakemore RappahannockINC.com Fredericksburg, VA
There are 90, 45, 22.5 and 11.25 degree fittings available in rigid PVC - maybe not at the big box.
90, 45 and 22.5 also available in "street" configuration.
By rotaing "street" fittings inside of "hub" fittings you can produce pretty much any angle. For instance, if I were to place a hubbed 90 on the end of the vertical vent stack at a 90 degree angle to the "long run" of pipe - then insert a street 90 into my hubbed 90 --- I can rotate the street 90 by 360 degrees - will line up with any angle from the long pipe run.
Your son should be able to come up with some combination which will connect. May not be the prettiest inside of the attic, but will work and still provide drainage of the long pipe run.
He may need to shorten (and support) vertical run or adjust the current angle / length of the long pipe run a bit to make it line up.
Keep in mind the long run only needs 1/4" per foot pitch back toward the sink to drain any rain water / condensation out of itself. The old pipe may need to be straightened somewhat due to sagging over the years in the attic. All pipe will need to be strapped securely to avoid future sagging.
My understanding is that a vent lateral (from the sink)can tie in to the main vent stack anywhere below the roof deck and be acceptable, i.e., it does not have to connect right above the ceiling joists / bottom chords of trusses.
My advice would be to get a bunch of street and hubbed bends - start playing - you will get it fairly quickly.
Jim