I am remodelling my kitchen and the most logical place for the tumble dryer
is against an internal wall. Can it be vented up and out a flat roof. The
washing machine can empty the waste water into the soil pipe in a planned
toilet/shower room. I planned to vent the toilet out through the flat roof
so was wondering if the tumble dryer can vent out the same place. I need to
ensure that the hot air from the tumble dryer doesn't vent back into the
toilet.

Kevin.

Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble dryer
is against an internal wall. Can it be vented up and out a flat roof. The
washing machine can empty the waste water into the soil pipe in a planned
toilet/shower room. I planned to vent the toilet out through the flat roof
so was wondering if the tumble dryer can vent out the same place. I need to
ensure that the hot air from the tumble dryer doesn't vent back into the
toilet.

Never a good idea to have vents like this through a flat roof; lots of
scope for leaks. Certainly possible though.

Pretty sure you wouldn't be allowed to combine the toilet and
tumble-drier vents but Building Regs gurus here may know better.

My first thought though is are you sure you need the vent even for the
toilet - ie, have you looke into the possibility of fitting it with an
air-admittance valve instead?
http://www.screwfix.com/prods/78150/Plumbing/Soil-Vent/FloPlast-Push-Fit-Air-Admittance-Valve-Grey?cm_re=SEARCHPROMO-_-AIR-ADMITTANCE-_-78150
May or may not be possible depending on various factors; however maybe
you've already been down this road?

David

"Lobster" wrote in message
...
Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble
dryer is against an internal wall. Can it be vented up and out a flat
roof. The washing machine can empty the waste water into the soil pipe in
a planned toilet/shower room. I planned to vent the toilet out through
the flat roof so was wondering if the tumble dryer can vent out the same
place. I need to ensure that the hot air from the tumble dryer doesn't
vent back into the toilet.

Never a good idea to have vents like this through a flat roof; lots of
scope for leaks. Certainly possible though.

Pretty sure you wouldn't be allowed to combine the toilet and tumble-drier
vents but Building Regs gurus here may know better.

My first thought though is are you sure you need the vent even for the
toilet - ie, have you looke into the possibility of fitting it with an
air-admittance valve instead?
http://www.screwfix.com/prods/78150/Plumbing/Soil-Vent/FloPlast-Push-Fit-Air-Admittance-Valve-Grey?cm_re=SEARCHPROMO-_-AIR-ADMITTANCE-_-78150
May or may not be possible depending on various factors; however maybe
you've already been down this road?

David

This is a medium to long term plan that will involve building a kitchen
extention and toilet shower room. I am trying to visualise the options
before getting any plans done. I don't quite understand how the air
admittance valve works so I need to look into that.
I have a cooker hood extracting through a flat roof and that is ok.

Kevin

Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble
dryer is against an internal wall. Can it be vented up and out a flat
roof. The washing machine can empty the waste water into the soil
pipe in a planned toilet/shower room. I planned to vent the toilet
out through the flat roof so was wondering if the tumble dryer can
vent out the same place. I need to ensure that the hot air from the
tumble dryer doesn't vent back into the toilet.

Kevin.

instead of spending a fortune on venting the existing TD, why not just
purchase a condensing one?

About £150ish.

If you start knocking holes out of a flat roof, it's likely to end up
costing you many hundreds of pounds.

Zen83237 wrote:


"Lobster" wrote in message
...
Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble
dryer is against an internal wall. Can it be vented up and out a flat
roof. The washing machine can empty the waste water into the soil pipe in
a planned toilet/shower room. I planned to vent the toilet out through
the flat roof so was wondering if the tumble dryer can vent out the same
place. I need to ensure that the hot air from the tumble dryer doesn't
vent back into the toilet.
Never a good idea to have vents like this through a flat roof; lots of
scope for leaks. Certainly possible though.

Pretty sure you wouldn't be allowed to combine the toilet and tumble-drier
vents but Building Regs gurus here may know better.

My first thought though is are you sure you need the vent even for the
toilet - ie, have you looke into the possibility of fitting it with an
air-admittance valve instead?
http://www.screwfix.com/prods/78150/Plumbing/Soil-Vent/FloPlast-Push-Fit-Air-Admittance-Valve-Grey?cm_re=SEARCHPROMO-_-AIR-ADMITTANCE-_-78150
May or may not be possible depending on various factors; however maybe
you've already been down this road?

This is a medium to long term plan that will involve building a kitchen
extention and toilet shower room. I am trying to visualise the options
before getting any plans done. I don't quite understand how the air
admittance valve works so I need to look into that.

Where conventionally you would have a soil stack venting upwards, you'd
basically cap it off with an AAV rather than have it go up through the
roof. It uses the fact that you don't (necessarily) need to let air
*out* of the system, but you do need to let air *in* to avoid vaccuum
formation and the toilet not flushing etc. The AAV is a one-way valve
which lets that happen, ie without letting gas out of sewer into your
house; and would be a no-brainer in your scenario provided it's
appropriate... there are several conditions eg you can't be at the end
of the run of your sewer; at least every 3 or 4 houses(?) has to have a
fully open vent etc.

David

Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble
dryer is against an internal wall. Can it be vented up and out a flat
roof. The washing machine can empty the waste water into the soil
pipe in a planned toilet/shower room. I planned to vent the toilet
out through the flat roof so was wondering if the tumble dryer can
vent out the same place. I need to ensure that the hot air from the
tumble dryer doesn't vent back into the toilet.

I'd be rather more concerned that the toilet smells didn't get back into the
tumble drier :-)


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk

On 30 May, 18:44, Lobster wrote:
Zen83237 wrote:
I planned to vent the toilet out through the flat roof
so was wondering if the tumble dryer can vent out the same place.

My first thought though is are you sure you need the vent even for the
toilet - ie, have you looke into the possibility of fitting it with an
air-admittance valve instead?

By 'vent the toilet' does the OP mean 'vent the stack,' or 'vent the
WC
extractor'?

Might make a wee bit of difference to answers around combining the
two.

J

Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble dryer
is against an internal wall. Can it be vented up and out a flat roof.
snip
I'd be concerned about such a long vertical run: what would happen to
any water that condenses out of the exhaust stream?

And as others have said, the complications of a long-term weather-proof
hole in a flat roof do not appeal.

Sounds like a case for a condensing drier.

--
Kevin Poole
****Use current date to reply (e.g. )****

Kevin Poole wrote:


Zen83237 wrote:
I am remodelling my kitchen and the most logical place for the tumble
dryer is against an internal wall. Can it be vented up and out a flat
roof.
snip
I'd be concerned about such a long vertical run: what would happen to
any water that condenses out of the exhaust stream?

Self-flushing toilet? ;-)

David

wrote in message
...
On 30 May, 18:44, Lobster wrote:
Zen83237 wrote:
I planned to vent the toilet out through the flat roof
so was wondering if the tumble dryer can vent out the same place.

My first thought though is are you sure you need the vent even for the
toilet - ie, have you looke into the possibility of fitting it with an
air-admittance valve instead?

By 'vent the toilet' does the OP mean 'vent the stack,' or 'vent the
WC
extractor'?

Might make a wee bit of difference to answers around combining the
two.

J

Yes, I mean vent the room. I should also point out that the existing soil
pipe to the upstairs bathroom will have to go through the flat roof. The wc
can discharge into the existing soil pipe.

Kevin