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Weather proof bathroom vent on roof - cowl fitting?

Discussion in 'Roofing and Guttering' started by Scott Stevens, 24 Sep 2018.

  1. Scott Stevens

    Scott Stevens

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    I've had a constant build up of water in our extractor fan ducting in the loft. This has been made worse by a tear in the ducting causing a leak to spread.

    There doesn't appear to be water dripping inside the loft from the outer edge of the pipe so I think the seal is secure holding the pipe in place.

    For whatever reason the rain water is building up in the ducting. We no longer use the extractor fan therefore I'm pretty sure it must be external water (rain) building up.

    I originally thought the external vent of the roof or the pipe exposed on the roof might be damaged causing rain water to enter the pipe and ducting. Now I think it might possibly be an inadequate vent cowl (I think that's what you call them!) that was replaced in a hurry by a roofer a year or so ago.

    I've attached a picture of this and a link to the item I think the roofer bought at the time (a FloPlast ring seal soil vent ring terminal).

    Does this look like the wrong type of weather proof fitting? If so, can anyone recommend something more suitable to withstand the wind and rain?

    Many thanks
     

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  3. Nige F

    Nige F

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    It's wrong. That's just a vent terminal - you want a FloPlast soil extract cowl.
     
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  4. datarebal

    datarebal

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    get rid of the cage and get a mushroom cowl.
     
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  5. Scott Stevens

    Scott Stevens

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    Something like this one? This new attached picture is from another part of the house, although I don't actually know what it's for.

    Or should I replace this one as well?

    Is there any specific suppliers or brands that are better to use? I had a look at B&Q website before but I couldn't see anything suitable.

    Thanks
     

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  6. SFK

    SFK

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  7. Scott Stevens

    Scott Stevens

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    It might be a daft question but how do these mushroom cowls allow steam from an extractor fan to escape? Its not obvious from the pictures or descriptions.
     
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  9. SFK

    SFK

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    It is a tube that has a cap on it, with the tube held a short distance from the cap.
    This means the vents where the air escapes is the gap between rim of cap and the tube.
    So air is blown along tube, hits the cap, changes dorection and leaves from gap.

    (The gap or vent holes is where the black coloured area is on a real mushroom.)
    Sfk
     
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  10. Scott Stevens

    Scott Stevens

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    Thanks for the advice. I think the mushroom vent cowl looks like a good option. I might replace that other one to be on the safe side.

    Are these easy enough to fit or should I get a roofer in? Want to make sure they stay in place with the wind.
     
  11. datarebal

    datarebal

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    Thats what they are for... glue the new ones in place.
     
  12. Scott Stevens

    Scott Stevens

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    Just a follow up question with this...

    So I replaced the bathroom extractor vent cowl with the mushroom one from toolstation (see attached pic).

    At the same time I decided to replace the soil vent with the same type of cowl.

    I was just wondering if it is actually a good idea to replace the soil vent cowl with this type of cowl that prevents any external rain water entering the system? Is it beneficial to allow rain water in to provide an extra clean of the soil pipes?

    Thanks
     

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  13. SFK

    SFK

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    Scott,

    I do not see you putting a Mushroom cover on your soil pipe casing any issues.

    There is no requirement for (the tiny amount) of rainwater to wash the inside of a soil vent pipe.

    And I guess you house looks (slightly) better having both pipes with same cap (although I bet most will not notice).

    SFK
     
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  14. Scott Stevens

    Scott Stevens

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    Thanks SFK that's reassuring to know.

    Cheers

    Scott
     
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