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Minimum Attic Insulation

  • 11-04-2008 10:04am
    #1
    tdavfc
    Registered Users, Registered Users 2 Posts: 132 ✭✭


    Hi,

    Currently getting an extension done. Just wondering what is the minimum insulation the builder should be putting in the attic. Had a look at the rolls of insulation he had and its fiber glass (I think) and 100mm thick. Any help would be grateful.

    Thanks,
    TDAVFC


Comments

  • #2
    hopalong_ie
    Closed Accounts Posts: 175 ✭✭hopalong_ie


    I think its .22u, in terms of fibreglass its about 300mm i think, or 100mm of polyiso which is a rigid board.


  • #3
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    minimum current regs for fibre quilt insulation is 300mm on a flat ceiling.


  • #4
    muffler
    Registered Users, Registered Users 2 Posts: 46,555 ✭✭✭✭muffler


    sydthebeat wrote: »
    minimum current regs for fibre quilt insulation is 300mm on a flat ceiling.
    Agreed.


  • #5
    tdavfc
    Registered Users, Registered Users 2 Posts: 132 ✭✭tdavfc


    Thanks Guys for the info, much appreciated...


  • #6
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    just to add that to get the best result the space between the joists is filled first and then the layer above the joists is cross-laid across the joists to reduce cold bridging


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  • #7
    tdavfc
    Registered Users, Registered Users 2 Posts: 132 ✭✭tdavfc


    ircoha wrote: »
    just to add that to get the best result the space between the joists is filled first and then the layer above the joists is cross-laid across the joists to reduce cold bridging

    Thanks ircoha... Can I ask in the case you mentioned what would you do if I was to put down some flooring. Also could you tell me what people do if there is lots of down lights in the attic. Its a bungalow house I have..

    Thanks,
    TDAVFC


  • #8
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    Oh no, not another surrogate or other wise attic extension:)

    It all depends on what u want to do afterwards with the space. is it for storage? do u have the height to lose another 4 inches

    Assuming the joists are 225 deep then u can fill in between the joists from here size wise http://www.uvalue.ie/uvalue.pdf
    and then counter batten with 100 by 50 joists to give u the additional 100.
    Your flooring will go on top

    Now to the downlighters which I presume are in the ceiling below the attic.

    They need to be boxed out with fire resistant material to stop the FG falling in on them.
    The folks over in electrical may be able to help with the requisite spec.


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