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U value query

  • 28-05-2008 11:33am
    #1
    slowharry
    Registered Users, Registered Users 2 Posts: 257 ✭✭


    i was looking at the regs and cant get my head around the logic with the u value requirement at ceiling level into an unheated attic space being 0.16 and a flat roof being 0.22. both secenarios are heat loss to the building. u values between walls and floors are irrespective of wheter its into an unheated space or external.

    maybe i'm just missing something


Comments

  • #2
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    your not - I agree with you , but

    read values as MIN values


  • #3
    slowharry
    Registered Users, Registered Users 2 Posts: 257 ✭✭slowharry


    thanks sinnerboy

    yeah i agree with using them at min values. i always try to get an understanding of where a code/regulation is coming from and the thinking behind it (none in this case). it makes working with it alot easier.


  • #4
    Mellor
    Registered Users, Registered Users 2 Posts: 39,902 ✭✭✭✭Mellor


    The flat roof one should be alot lower, equal to the trad roof insulated on flat
    (i'm not saying the pic in the op is wrong, im saying this should be the case)


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