The location I am considering placing a the bath in my new bathroom layout
is with the bath waste almost directly above a horizontal run of the 110mm
bathroom waste pipe running under the floor. This section of 110mm pipe
connects the soil stack to a 110mm air admittance valve, thus actually
currently has no water running in it.

Due to space constraints it is not possible to get a strap on boss on the
side of the 110mm pipe and connect the bath waste to it (structural I-beam
joists are in the way) so is it permissible to connect the boss to the upper
surface of the 110mm pipe an pipe the bath waste to that ?

Might be slightly noisier ?

Is there a pipe wear issue due to the 110mm "drop" ?

"Ian_m" wrote in message
...
The location I am considering placing a the bath in my new bathroom layout
is with the bath waste almost directly above a horizontal run of the 110mm
bathroom waste pipe running under the floor. This section of 110mm pipe
connects the soil stack to a 110mm air admittance valve, thus actually
currently has no water running in it.

Due to space constraints it is not possible to get a strap on boss on the
side of the 110mm pipe and connect the bath waste to it (structural I-beam
joists are in the way) so is it permissible to connect the boss to the
upper
surface of the 110mm pipe an pipe the bath waste to that ?

Might be slightly noisier ?

Is there a pipe wear issue due to the 110mm "drop" ?


It is perfectly acceptable to connect to the top of the soil pipe.

In an earlier contribution to this discussion,
Ian_m wrote:

The location I am considering placing a the bath in my new bathroom
layout is with the bath waste almost directly above a horizontal run
of the 110mm bathroom waste pipe running under the floor. This
section of 110mm pipe connects the soil stack to a 110mm air
admittance valve, thus actually currently has no water running in it.

Due to space constraints it is not possible to get a strap on boss on
the side of the 110mm pipe and connect the bath waste to it
(structural I-beam joists are in the way) so is it permissible to
connect the boss to the upper surface of the 110mm pipe an pipe the
bath waste to that ?
Might be slightly noisier ?

Is there a pipe wear issue due to the 110mm "drop" ?


I see no problem with that as long as your 'horizontal' pipe has a slight
*fall* towards the stack, and not the other way!
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!

Ian_m wrote:
The location I am considering placing a the bath in my new bathroom
layout is with the bath waste almost directly above a horizontal run
of the 110mm bathroom waste pipe running under the floor. This
section of 110mm pipe connects the soil stack to a 110mm air
admittance valve, thus actually currently has no water running in it.

Due to space constraints it is not possible to get a strap on boss on
the side of the 110mm pipe and connect the bath waste to it
(structural I-beam joists are in the way) so is it permissible to
connect the boss to the upper surface of the 110mm pipe an pipe the
bath waste to that ?
Might be slightly noisier ?

Is there a pipe wear issue due to the 110mm "drop" ?

I've seen many basin wastes connected into the top of a horizontal soil
pipe, so I wouldn't think you would have a problem.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk
01634 717930
07850 597257

Roger Mills wrote:
In an earlier contribution to this discussion,
Ian_m wrote:

The location I am considering placing a the bath in my new bathroom
layout is with the bath waste almost directly above a horizontal run
of the 110mm bathroom waste pipe running under the floor. This
section of 110mm pipe connects the soil stack to a 110mm air
admittance valve, thus actually currently has no water running in it.

Due to space constraints it is not possible to get a strap on boss on
the side of the 110mm pipe and connect the bath waste to it
(structural I-beam joists are in the way) so is it permissible to
connect the boss to the upper surface of the 110mm pipe an pipe the
bath waste to that ?
Might be slightly noisier ?

Is there a pipe wear issue due to the 110mm "drop" ?

I see no problem with that as long as your 'horizontal' pipe has a slight
*fall* towards the stack, and not the other way!

Yes - I trust the AAV is not mounted on the end of the (near?)
horizontal pipe, but rather, is mounted so it points skyward?

David

"Lobster" wrote in message
...
Roger Mills wrote:
In an earlier contribution to this discussion,
Ian_m wrote:

The location I am considering placing a the bath in my new bathroom
layout is with the bath waste almost directly above a horizontal run
of the 110mm bathroom waste pipe running under the floor. This
section of 110mm pipe connects the soil stack to a 110mm air
admittance valve, thus actually currently has no water running in it.

Due to space constraints it is not possible to get a strap on boss on
the side of the 110mm pipe and connect the bath waste to it
(structural I-beam joists are in the way) so is it permissible to
connect the boss to the upper surface of the 110mm pipe an pipe the
bath waste to that ?
Might be slightly noisier ?

Is there a pipe wear issue due to the 110mm "drop" ?

I see no problem with that as long as your 'horizontal' pipe has a slight
*fall* towards the stack, and not the other way!

Yes - I trust the AAV is not mounted on the end of the (near?) horizontal
pipe, but rather, is mounted so it points skyward?

The AAV is mounted on a vertical section at approx 1m above the floor level.

Yes the pipe does slope towards the soil pipe rather than the AAV end.

Only other thing, my brother who is/was a plumber/site manager came up with
is don't make the bath waste connection too short as he has met leaking bath
wastes where it dropped almost straight into a 110mm pipe and had no give or
movement. After about 2 years it started leaking at both boss connection and
bath plug as there was probably no "give" in the waste pipework to allow for
settlement/movement of both the bath and waste pipe. He fixed by running the
40mm bath waste pipe about a foot along the 110mm waste into a new boss thus
allowing some flexibility between the bath and 110mm waste.