Bathroom extractor Fan in flat roof

We had a dormer extention done last year for a bathrom. I have just
had a fault with the ceiling extractor fan and have taken it out of
the ceiling and found that it just vents straight into the roof void,
there are vents in the soffets but I am sure this is not the way to do
it. How should it have been done. Should it vent via a pipe through
the flat roof, and if so how.
Thanks
Reply to
sjones
On Tue, 22 Jan 2008 12:16:58 -0800 (PST) someone who may be this:-
Roofs, especially flat roofs, should have as few holes in them as possible. Zero is the ideal number, as there are then no holes through which water will probably make its way eventually.
There are a number of ways it should have been done. One of them is shown in
formatting link
depending on your particular circumstances others may be better.
Reply to
David Hansen
The Builders have stated that the extractor flexible pipe should have gone into the soffets, where there are holes/air vents and it has somehow become detached, can't see how you could have attached it though, the holes are lots of small slits. Is this normal? Thanks
Reply to
sjones
On Wed, 23 Jan 2008 04:01:27 -0800 (PST) someone who may be this:-
It is normal to discharge air this way, as is illustrated in the link I posted.
However, the discharge should be through a suitable terminal, which will have a spigot onto which the ducting is connected. The companies I mentioned will have suitable terminals in their catalogues. The small slits are to ventilate the roof space, not to form the discharge from extractor fans. If the builder did provide a suitable terminal you will be able to see it, as it will be a different size/shape to the slots. I suspect you will find that, for whatever reason, they did not install one.
Reply to
David Hansen
On 23 Jan, 10:01, David Hansen wrote:
this:- >
not wide enough for the outlet grill, the extractor pipe is a bigger diameter than the overhang. Thanks for the help
Reply to
sjones
On Wed, 23 Jan 2008 07:01:57 -0800 (PST) someone who may be this:-
I assumed that the fan discharged into the original loft, not the flat roof.
There are oblong terminals, into which oblong ducting can be connected, if a circular duct is too large to go through something.
Reply to
David Hansen
this:- >
Yes. Often they don't. I have run a flexi pipe to a soffit, and put in a grelle - a special one for the extractor. It was a right bloody fiddle to get it all installed.
Its so easy to leave it out..and because soffit ventilation is vastly overspecified (IMO), and chances are no one will ever notice.
Reply to
The Natural Philosopher
On 23 Jan, 15:15, David Hansen wrote:
this:- > > >My roof is a flat roof and the soffet overhang is about 3 inches wide, > >not wide enough for the outlet grill, the extractor pipe is a bigger > >diameter than the overhang. > > I assumed that the fan discharged into the original loft, not the > flat roof. > > There are oblong terminals, into which oblong ducting can be > connected, if a circular duct is too large to go through something. > > -- > David Hansen, Edinburgh > I will *always* explain revoked encryption keys, unless RIP prevents me >
formatting link
, I will look into it
Reply to
sjones
On 23 Jan,
Just discharging into a cold space is a recipe for disater in years to come. Condensation will lead to rot.
Reply to
<me9

Site Timeline Threads

  • Soooooo since no one is mentioning building something I'll mention the POS I...
  • site's last updated in

    Woodworking

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.