Bathroom Extraction Fan

Discussion in 'Plumbing and Central Heating' started by Greenie9657, 26 Apr 2016.

  1. Greenie9657

    Greenie9657

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    Good Evening All,

    I'm just in the middle of re-doing my bathroom due to a recent bedroom extension. (the fan did go on the outside wall but that is now my 4th bedroom!) The roof above is flat and I really don't want unsightly ducting in the bathroom. Anyway, I was wondering I may have room if I go through the roof and use the rectangular ducting to find a root outside. I'm guessing I can just buy something that will angle the joint from the back of the fan at 90 degrees from 100mm to rectangle? Also I thought buying a fan was easy but I have just been advised that as I am now wanting to go through ducting, a centrifugle fan would be required.

    I could get to an outside wall in the bathroom but it will be the opposite wall to where the shower will be so I was hoping to put the fan in the roof above the shower enclosure.

    Thanks for your time.
     
  2. flameport

    flameport

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  4. Greenie9657

    Greenie9657

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    Thanks flame. I was looking at coming straight out of the flat roof but my concerns were I had this roof replaced last year and is now a GRP flat roof. How would you cut it without it cracking and how would you seal it from the elements? Surely not just silicone?
     
  5. bernardgreen

    bernardgreen

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  7. dilalio

    dilalio

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    Go through the roof!
    It's done all the time and there are plenty of ways to make it watertight.

    Core cut/hole saw through and use a roof slate with a rubber grommet to push the pipe through. Slate against grp bonded with sikaflex EBT and painted over the top with flexacryil or other paint on roofing compound.

    I have three such installations in my flat roof... Boiler flue, shower room extractor and cooker hood extractor - been watertight for years (y)
     
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  8. DIYnot Local

    DIYnot Local

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    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

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