I find myself having to install a ventilation for an internal bathroom
I'm building[1]. Unfortunately there's no alternative for the exit
pipe to go straight up through the roof - no direct access to any
external walls as it's a mid-terrace; and because it's also a corner
terrace it would be tough (and unsightly) to reach an external wall
via bozed in ducting.

So how difficult is this to do, and leave a sound, non-leaking roof?
What's the best device for a newbie to use? Had a look on Screwfix
but can't see anything. Roof has flat tiles, think they are slate.

Thanks
David

[1] Just bought the place. This internal room has apparently been
used as a shower-room of sorts. There is an old ventilation grill in
the ceiling, so yesterday I went up to the loft to find what was on
the other side of it; hoping for at least a duct and a broken fan
maybe. I found a large ancient, galvanized steel box about 18" cube,
firmly fixed down over the grille. Very curious. Box had several
other grilles in the sides, and one had been prised open by someone in
order to look inside. The contents... nothing, zip, nada. The only
purpose seems to be to provide an air conduit into the roof space.
Presumably building control must have been OK with that when it was
fitted!

"David" wrote in message
om...
I find myself having to install a ventilation for an internal bathroom
I'm building[1]. Unfortunately there's no alternative for the exit
pipe to go straight up through the roof - no direct access to any
external walls as it's a mid-terrace; and because it's also a corner
terrace it would be tough (and unsightly) to reach an external wall
via bozed in ducting.

So how difficult is this to do, and leave a sound, non-leaking roof?
What's the best device for a newbie to use? Had a look on Screwfix
but can't see anything. Roof has flat tiles, think they are slate.

If you have a soil stack already going through the roof, then use thjis.
Cut it in the loft and install an air admittance valve. the the pipe
pemnetrating through roof, use asa vent.

Also, measure the tiles on your roof. There are special vent tiles
available. Go to a builders merchant for one of these. Just slip out a
tile and slip in the new vent tile. They look very neat.

[1] Just bought the place. This internal room has apparently been
used as a shower-room of sorts. There is an old ventilation grill in
the ceiling, so yesterday I went up to the loft to find what was on
the other side of it; hoping for at least a duct and a broken fan
maybe. I found a large ancient, galvanized steel box about 18" cube,
firmly fixed down over the grille. Very curious. Box had several
other grilles in the sides, and one had been prised open by someone in
order to look inside. The contents... nothing, zip, nada. The only
purpose seems to be to provide an air conduit into the roof space.
Presumably building control must have been OK with that when it was
fitted!

You are now not allowed to vent moist air into the loft. Seal it up.


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"David" wrote
| I find myself having to install a ventilation for an internal bathroom
| I'm building[1]. Unfortunately there's no alternative for the exit
| pipe to go straight up through the roof - no direct access to any
| external walls as it's a mid-terrace; and because it's also a corner
| terrace it would be tough (and unsightly) to reach an external wall
| via bozed in ducting.
| So how difficult is this to do, and leave a sound, non-leaking roof?
| What's the best device for a newbie to use? Had a look on Screwfix
| but can't see anything. Roof has flat tiles, think they are slate.

You can get all-on-one flashing / tile infill / fan outlet things in the
builders merchants.

Using Internet Explorer (probably) visit www.ubbink.co.uk and let your mouse
hover over Domestic Fans & Ducting - Accessories - Roof Terminals

From then on their coding did something bad to Opera, so I can't see what
happens.

Owain