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Insulation Requirements

  • 16-05-2012 10:47PM
    #1
    Kanu78
    Registered Users, Registered Users 2 Posts: 4 ✭


    I'm putting underfloor heating in my house and need to know how much insulation I need to put in my floors to comply with regulations? Is 150mm enough? I'm also going the traditional cavity wall route and settled on a full-fill kingspan board in a 150mm cavity. It delivers a u-value of 0.19 on its own. Do I need to put thermal boards on the internal walls too to reduce this u-value? My internal wall is 215mm.


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,147 Mod ✭✭✭✭BryanF


    Kanu78 wrote: »
    I'm putting underfloor heating in my house and need to know how much insulation I need to put in my floors to comply with regulations? Is 150mm enough? I'm also going the traditional cavity wall route and settled on a full-fill kingspan board in a 150mm cavity. It delivers a u-value of 0.19 on its own. Do I need to put thermal boards on the internal walls too to reduce this u-value? My internal wall is 215mm.
    To answer your question re b regs you need to carry out a provisional ber. IMO 200mm insulation should be used in the floor getting you down to circa .1wm2k


  • #3
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    there is an aero-board full fill product you should take a look at it will give you the 0.20w/m*k uvalue for half the cost and wall ties are included, but imo you will need to internaly line the walls with a 38mm insulated slab and bring your uvalue to 0.17 ( i think) this will offset the use of the steel wall ties.


  • #4
    sydthebeat
    Subscribers, Paid Member Posts: 43,828 ✭✭✭✭sydthebeat


    its best practise to keep all your insulation in the one plane... thermal boards are not a good idea.

    If you have a target u value, meet this by increasing the size of the cavity.

    you need to have a provisional Ber carried out now in order to know what spec you need. The days of looking at each element individually are over.


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