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Attic insulation to meet Part L regs

  • 25-01-2017 11:17am
    #1
    GLENNFALLON
    Registered Users, Registered Users 2 Posts: 37 ✭


    Hi Can anyone help. I don't understand that much about U-values. I want to insulate my attic. How much insulation do I need in order to meet part L regs


Comments

  • #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 41,588 Mod ✭✭✭✭Gumbo


    GLENNFALLON wrote: »
    Hi Can anyone help. I don't understand that much about U-values. I want to insulate my attic. How much insulation do I need in order to meet part L regs

    New build house?
    Attic conversion?
    or just upgrading existing attic space?

    Can you post a picture of your attic to give an idea of layout and any obstacles.


  • #3
    sydthebeat
    Subscribers Posts: 42,581 ✭✭✭✭sydthebeat


    if its a new build, the depth required is completely dependent on the other aspects of the build.
    I've seen everything from 250mm to 500mm being required to comply.

    on an existing build, as an upgrade, the backstop u value requirement is 0.16 which, assuming a standard attic fibreglass of 0.044 TC, youd need 270mm +

    if you use a 0.036 TC product, 250mm might get you out.


  • #4
    GLENNFALLON
    Registered Users, Registered Users 2 Posts: 37 ✭GLENNFALLON


    Its a new build. Airtight membrane used. 150mm full fill cavity insulation and GSHP


  • #5
    Gumbo
    Moderators, Society & Culture Moderators Posts: 41,588 Mod ✭✭✭✭Gumbo


    GLENNFALLON wrote: »
    Its a new build. Airtight membrane used. 150mm full fill cavity insulation and GSHP

    What has your BER Report specified?
    Why not run with this?


  • #6
    GLENNFALLON
    Registered Users, Registered Users 2 Posts: 37 ✭GLENNFALLON


    400 mm to achieve 0.11. I want to get some kind of storage in my attic and 400mm is alot to counter batten


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  • #7
    sydthebeat
    Subscribers Posts: 42,581 ✭✭✭✭sydthebeat


    GLENNFALLON wrote: »
    400 mm to achieve 0.11. I want to get some kind of storage in my attic and 400mm is alot to counter batten

    as its a new build, whatever change you make to the spec needs to be re-assessed by your assessor.

    you might consider PIR in place of some of the quilt.


  • #8
    Dudda
    Registered Users, Registered Users 2 Posts: 1,541 ✭✭✭Dudda


    What stage is the build at? You could look at changing it to a warm roof so the insulation is between the rafters and not the ceiling joists or go half in each area. Also be sure the attic area can take the weight of whatever it is you're storing. If it's a few christmas decorations and empty suit cases you'll be ok but if it's the contents of a grandparents library you inherited and want to store you'll have problems.


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