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Correct Insulation for Flat Roof

Discussion in 'General DIY' started by mjl215, 13 Oct 2020.

  1. mjl215

    mjl215

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    Hi,

    I am renovating a property that had been empty for a while and there was a leak going through a flat roof which has a terrace on it, into the kitchen of the ground below. The leak has been fixed and the damaged plasterboard for the ceiling of the kitchen have been removed.

    At the moment there is a layer of thin insulation that goes between the flat roof and the beams, and between 2 sets of beams there was also additional insulation that looks to be loft insulation.

    What is the correct way to insulate this roof? Should I add loft insulation between the beams that are missing it, add a different type of insulation between the beams or should the layer of insulation between the beams and flat roof be enough?

    I have also read that if this a cold flat roof I will need to leave a gap between the roof and the insulation for air flow but I am not sure if this a cold flat roof or not.

    Here are pictures of the flat roof and insulation

    bottom_of_flat_roof.jpg Bottom of flat roof material
    terrace_above_roof.jpg Terrace above flat roof
    additional_insulation.jpg Additional insulation between 2 sets of beams
    insulation_between_beams_and_roof.jpg insulation between beams and roof above



    Any advice is greatly appreciated, thanks.
     
    Last edited by a moderator: 13 Oct 2020
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  3. foxhole

    foxhole

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    The first pic seems to be base of concrete mat roofing, does that area have no insulation?
     
  4. mjl215

    mjl215

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    Hi,

    The area from the 1st picture is insulated in most places by the insulation in the 4th picture, but in one area about a 1m length between 2 beams in missing.

    I just asked a roofer working next door and he said the material in the first picture contains a small amount of asbestos (I can't remember what he said the name of the material was), so I will probably avoid trying to replace the missing thin layer of insulation between the roof and beams so I don't risk disturbing the asbestos. The roofer also recommended using celotex or kingspan insulation board, but wasn't 100% sure this would be suitable.

    Thanks
     
  5. DIYnot Local

    DIYnot Local

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