Ask The Trades - Waste from sink

Welcome, Guest. Please Login or Register

	Apr 19^th, 2024, 7:40pm
View recently thanked users View top thanked users

Quote: Why is the third hand on the watch called the second hand?

Ask The Trades › DIY Forum › Plumbing Questions › Waste from sink

(Moderator: thescruff) - (Moderator Group: Board Moderator)

< Previous Topic | Next Topic >

Pages: 1

Waste from sink (Read 4040 times)

toomuchtooyoung GDPR opt-out	Waste from sink Apr 15^th, 2004, 11:13am Hi fellas, (and lasses) I am planning to fit a new bathroom in a few weeks and would like to hide all the pipework as neatly as possible. I was wondering whether it is allowed to put 32mm waste piping under the floor across joists by notching out - or whether this removes too much integrity of the joist? I look forward to your replies, TMTY.
Back to top	IP Logged

Super Member

Offline

Chief Turd Polisher
Posts: 5072

Total Thanks: 0
For This Post: 0

Gender: male

Re: Waste from sink
Reply #1 - Apr 15^th, 2004, 11:25am

[quote author=toomuchtooyoung link=1082024020/0#0 date=1082024020]I am planning to fit a new bathroom in a few weeks and would like to hide all the pipework as neatly as possible. I was wondering whether it is allowed to put 32mm waste piping under the floor across joists by notching out - or whether this removes too much integrity of the joist? [/quote]

There are limits on the amount of joist that you can remove before the joist is considered structurally unsound. I think 32mm is too much and it could weaken the joist to the point of being dangerous.

Andrew

If you aren't always sure of the right answer don't take up a career in the bomb squad

IP Logged

thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: Waste from sink Reply #2 - Apr 15^th, 2004, 12:36pm With 9" joists you can notch them to take a wastepipe. However 32mm isn't large enough it has to be a min 40mm. Notch has to be between 0.6-0.8 of its length, and should be protected where it goes through the timber. Consider an alternative route, like om the surface under the bath. plumb
Back to top	IP Logged

toomuchtooyoung GDPR opt-out Total Thanks: 147 For This Post: 0	Re: Waste from sink Reply #3 - Apr 15^th, 2004, 1:59pm Scruff, Are you saying that all sink wastes now have to be 40mm? I am sure that the existing is smaller (32mm) than the kitchen waste (which I assume is 40mm). ta, TMTY
Back to top	IP Logged

thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: Waste from sink Reply #4 - Apr 15^th, 2004, 2:59pm Basin wastes can be 32mm if it's not to long, otherwise use an anti-syphon trap. plumb
Back to top	IP Logged

Pages: 1

(Moderator: thescruff) - (Moderator Group: Board Moderator)

< Previous Topic | Next Topic >

Ask The Trades › DIY Forum › Plumbing Questions › Waste from sink