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insulation for flat roofed house

  • 31-08-2011 04:45PM
    #1
    Registered Users, Registered Users 2 Posts: 4,081 ✭✭✭


    Anyone out there had to insulate a flat roofed house? We have done the walls but figure that alot of heat is being lost through the roof. The last 2 winters have been not great.

    suggestions welcome. thanks.


Comments

  • Subscribers Posts: 42,644 ✭✭✭✭sydthebeat


    how much work do you want to do?

    we would first need to know what teh roof construction is and what insulation is already there.

    The rolls royce solution would be to remove the whole roof surface, insulate between, and over, the existing joists, and apply a new weathering finish


  • Registered Users, Registered Users 2 Posts: 4,081 ✭✭✭sheesh


    thanks syd

    Removing the roof would be a no no as the house is being lived in.

    Any body hear of any other methods.


  • Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    you need to make sure the roof is super sealed and correctly sloped before you going putting fresh insulation on top. from that I'm found of a green roof build- up:) but a bit more info on ex structure is needed..


  • Registered Users, Registered Users 2 Posts: 4,081 ✭✭✭sheesh


    ah jez, we did the roof in the late 80s cost irl£18,000 quiet a large sum at the time.


  • Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    sheesh, if your going to drip feed info then...what do want from us... get an arch tech & maybe an eng out to advise you..
    if the roof finish is correctly sloped and sealed and will last for the next 50 years then: I would put 200mm of EPS over the existing structure followed by a hemp/geotextile layer with an old carpet top and then 200mm of sedum clay on that. BUT the weight of that might knock your house down so go and get some body out to assess your roof structure first...

    there were no building regulations in the eighties...


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  • Subscribers Posts: 42,644 ✭✭✭✭sydthebeat


    sheesh, if removal of the roof finish i snot an option, then your only resort is to insulate from underneath.
    What depth have you to play with?
    what is the current roof construction?

    If you insulate in this flat roof you must ensure 50mm continuous air gap to prevent condensation problems. see section 2 and diagram 11 here

    is this possible in your case?


  • Subscribers Posts: 42,644 ✭✭✭✭sydthebeat


    sheesh wrote: »
    ah jez, we did the roof in the late 80s cost irl£18,000 quiet a large sum at the time.

    what was the finish? asphalt or butyl finish from that period usually didnt have a life span of more that 20 years.


  • Registered Users, Registered Users 2 Posts: 12,754 ✭✭✭✭galwaytt


    Install a new warm roof over the original - otherwise, as other's have pointed out, you'll lose space inside.

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  • Registered Users, Registered Users 2 Posts: 120 ✭✭PaudyW


    what height are the ceilings


  • Registered Users, Registered Users 2 Posts: 4,081 ✭✭✭sheesh


    sydthebeat wrote: »
    what was the finish? asphalt or butyl finish from that period usually didnt have a life span of more that 20 years.

    I don't know it was silver finish as opposed to the asphalt covering that was there before it
    galwaytt wrote: »
    Install a new warm roof over the original - otherwise, as other's have pointed out, you'll lose space inside.

    sounds like a plan thanks
    PaudyW wrote: »
    what height are the ceilings

    thought of that unfortunately the ceilings are too low to do the internal insulation


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  • Registered Users, Registered Users 2 Posts: 4,081 ✭✭✭sheesh


    BryanF wrote: »
    sheesh, if your going to drip feed info then...what do want from us... get an arch tech & maybe an eng out to advise you..

    oops sorry about that didn't mean to be lacking in info honestly haven't a clue about any thing about roofing or for that matter building.
    BryanF wrote: »
    if the roof finish is correctly sloped and sealed and will last for the next 50 years then: I would put 200mm of EPS over the existing structure followed by a hemp/geotextile layer with an old carpet top and then 200mm of sedum clay on that. BUT the weight of that might knock your house down so go and get some body out to assess your roof structure first...

    there were no building regulations in the eighties...
    I'll go away and look at what all this stuff means and get an engineer to take a look at it

    Thanks everyone for all the replies :)


  • Registered Users, Registered Users 2 Posts: 49 Briany3


    I am in the same position as you. I have flat roof, and want to insulate from the inside, without disturbing the ceiling. I was thinking about screwing some aeroboard to the ceiling, with large washers on the screws.
    What do ye thing. Open for ideas.


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