Bathroom extractor Fan in flat roof

Discussion in 'Misc DIY' started by sjones@scannex.co.uk, Jan 22, 2008.

  1. Guest

    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
     
    , Jan 22, 2008
    #1
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  2. wrote:
    > 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


    Its not ideal, but its acceptable.
     
    The Natural Philosopher, Jan 22, 2008
    #2
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  3. Guest

    On 22 Jan, 21:11, The Natural Philosopher <> wrote:
    > wrote:
    > > 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

    >
    > Its not ideal, but its acceptable.


    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
     
    , Jan 23, 2008
    #3
  4. Guest

    On 23 Jan, 10:01, David Hansen <>
    wrote:
    > On Tue, 22 Jan 2008 12:16:58 -0800 (PST) someone who may be
    > "" <> wrote this:-
    >
    > >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.

    >
    > 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 inhttp://www.ventaxia.co.uk/products/domestic/minivent.asp
    > but depending on your particular circumstances others may be better.
    >
    > --
    > David Hansen, Edinburgh
    > I will *always* explain revoked encryption keys, unless RIP prevents me
    > http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54


    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. Thanks for the help
     
    , Jan 23, 2008
    #4
  5. David Hansen wrote:
    > On Wed, 23 Jan 2008 04:01:27 -0800 (PST) someone who may be
    > "" <> wrote this:-
    >
    >> 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?

    >
    > 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.
    >
    >

    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.
     
    The Natural Philosopher, Jan 23, 2008
    #5
  6. Guest

    On 23 Jan, 15:15, David Hansen <>
    wrote:
    > On Wed, 23 Jan 2008 07:01:57 -0800 (PST) someone who may be
    > "" <> 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
    > http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54


    Thanks, I will look into it
     
    , Jan 23, 2008
    #6
  7. Guest Guest

    On 23 Jan,
    "" <> wrote:

    > 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. Thanks for the help


    Just discharging into a cold space is a recipe for disater in years to come.
    Condensation will lead to rot.

    --
    B Thumbs
    Change lycos to yahoo to reply
     
    Guest, Jan 23, 2008
    #7
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