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dormer roof insulation

  • 18-02-2011 10:44pm
    #1
    john paul mc
    Closed Accounts Posts: 7 ✭


    hi was just wondering could anyone advise me on the sloping part of my ceilings in my dormer.I only have xtratherm rafterloc between the rafters and then an ordinary slab on ceiling. the rafters are 6 inch i was wonndering is there any insulation i could put down between the breathable felt and the rafterloc.made the mistake of not putting a inslated slab on at the time


Comments

  • #2
    Poor Uncle Tom
    Registered Users, Registered Users 2 Posts: 14,547 ✭✭✭✭Poor Uncle Tom


    john paul mc wrote: »
    hi was just wondering could anyone advise me on the sloping part of my ceilings in my dormer.I only have xtratherm rafterloc between the rafters and then an ordinary slab on ceiling. the rafters are 6 inch i was wonndering is there any insulation i could put down between the breathable felt and the rafterloc.made the mistake of not putting a inslated slab on at the time
    NO, That space is there to attempt to comply with the building regulations. You could always put an insulated slab inside the plaster slab you already have.


  • #3
    beyondpassive
    Registered Users, Registered Users 2 Posts: 558 ✭✭✭beyondpassive


    Get a bigger oil tank and a pay rise.


  • #4
    muffler
    Registered Users, Registered Users 2 Posts: 46,547 ✭✭✭✭muffler


    beyondpassive wrote: »
    Get a bigger oil tank and a pay rise.
    We can do without those type of comments thanks.

    If you have nothing positive to contribute then dont post.


  • #5
    john paul mc
    Closed Accounts Posts: 7 ✭john paul mc


    the slopes are curved into the ceiling would be awkward to fit new slab onto it but it did cross my mind.If i could slide something down behind the existing insulation would be the job was thinking of 25mm xtratherm. What about tht micafill loose insulation .


  • #6
    tred
    Registered Users, Registered Users 2 Posts: 1,473 ✭✭✭tred


    john paul mc wrote: »
    the slopes are curved into the ceiling would be awkward to fit new slab onto it but it did cross my mind.If i could slide something down behind the existing insulation would be the job was thinking of 25mm xtratherm. What about tht micafill loose insulation .

    John Paul , did you air tight the house?. I put an insulated slab only at the sloped side of my storey 1/2 . As I have 400 mill of insulation in attic. No sure really what you can do now. If you put an insulated slab over what you have and reskimmed , ??. Not sure what stage ur at...need scaffolding etc for that..


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  • #7
    Casati
    Registered Users, Registered Users 2 Posts: 3,053 ✭✭✭Casati


    An insulted plasterboard is not necessary if you have put enough Xtratherm between the rafters- what thickness were the insulted panels?

    In order to get a .18 on a dormer- roughly at the level of current building regs, you would need an Xtratherm board between rafters of approx 150mm - you can check their site for extra information on this.

    As with others advise even with breathable menbrane you should still leave a gap


  • #8
    john paul mc
    Closed Accounts Posts: 7 ✭john paul mc


    ive got 100mm kingspan board cut to with the house is finishd so re slabing would be messy


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