New soil pipe depth

[Nige F]

For example:

View attachment 167134

It's fine replacing like for like - but a new stack is in effect a "single stack system " where a slow bend is required @ the bottom, and wastes etc. can be discharged into the sides of the pipe.

 

[Nige F]

For example:
]

It's fine replacing like for like - but a new stack is in effect a "single stack system " where a slow bend is required @ the bottom, and wastes etc. can be discharged into the sides of the pipe.

 

[John D v2.0]

It's fine replacing like for like - but a new stack is in effect a "single stack system " where a slow bend is required @ the bottom, and wastes etc. can be discharged into the sides of the pipe.

I never thought on that the reason our original soil vent pipe was separate was because on those days they didn't have proper long radius bends! But that does explain it a bit better.

 

[Ian H]

It's fine replacing like for like - but a new stack is in effect a "single stack system " where a slow bend is required @ the bottom, and wastes etc. can be discharged into the sides of the pipe.

I’d have to see some evidence from a speed camera positioned 1mtr from the rest bend to believe there is much difference between a slow and a tight bend.

 

[John D v2.0]

slow is the slow change of angle, not the speed of your flush falling!
Just means it stays in one smooth dose rather than bouncing off the side of the pipe in all directions.

 

[Leofric]

Oh, I thought it said ‘make sure you ask a load of daft questions’

Not as daft as some of the answers. As a matter of interest how long have you worked in building ?

 

[Ian H]

Not as daft as some of the answers. As a matter of interest how long have you worked in building ?

15 years repairing drains.

 

[Ian H]

slow is the slow change of angle, not the speed of your flush falling!
Just means it stays in one smooth dose rather than bouncing off the side of the pipe in all directions.

That sounds right in theory but it real life i’ve CCTV’d hundreds of drains and there is no difference in performance between the 2.

 

[noseall]

Slow radius bends assist rodding

 

[Nige F]

The slow bend @ the bottom of the modern Single Stack is to do with air compression @ the bottom of the stack and air movement possibly blowing waste traps . That's why lengths of wastes are stipulated, trap depths are and connections to the stack are too. An old fashioned SVP with a tight bend @ the bottom generally just served a WC - if more than 1 WC on the stack a vent pipe should have been installed. ( there was a thread recently about an OP removing an ancient vent connection to a WC.) . In the real world rules get bent and still work perfectly well As an example - I had a house where the downstairs WC had been installed the outlet through the wall to a stub stack and then a slow bend to the drain run - to make the Building Inspector happy when the extension was done - AFAIK. So when I got there I found the shower up on a 6 inch plinth and the drain outside backfalling to a old chamber with a buchan trap. Blocked . I removed the B....trap and re aligned the outlet, stopping leaking that had gone on for decades. Then I uncovered the pipe run (plastic) and re arranged the lot with a mini chamber taking the WC on a tight bend and a gulley for the shower waste at lower level ( and a low level tray fitted).The stub stack became a full height vent stack. Build Control was not involved because it was maintenance.

 

[Leofric]

15 years repairing drains.

Fair enough. So do you come across many drains needing repair because the pipes are too near the surface without any protection ?

 

[Ian H]

Fair enough. So do you come across many drains needing repair because the pipes are too near the surface without any protection ?

No.