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Air tightness in block built house

  • 18-11-2008 1:55pm
    #1
    niall_walsh
    Registered Users, Registered Users 2 Posts: 112 ✭✭


    Hi was wondering if anyone had any recommendations on air tightness issues that i should consider before building a block cavity house.

    I was recommended to stratch coat the inside of the exterior walls before the insulated slabs are put up.

    Is there anything else i should mention to the builder before he starts?


Comments

  • #2
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    niall_walsh wrote: »
    Hi was wondering if anyone had any recommendations on air tightness issues that i should consider before building a block cavity house.

    I was recommended to stratch coat the inside of the exterior walls before the insulated slabs are put up.

    Is there anything else i should mention to the builder before he starts?

    achieving an acceptable level of airtightness will require much more than a 'mention':)
    The devil is in executing the detail correctly at all stages of construction: I will PM u a link to a company who has produced a leaflet on the issues: I am not recommending them, but they do cover all the bases in a more readable form than I can type here:)

    PS: the scratch coat idea will help


  • #3
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    I agree with above. Sealing around timber joists, in blockwork walls, is important.

    There are 3 suppliers of airtight materials, at the moment. One has been on the market in Ireland, for a number of years. Each company have detailed documents on their web sites - Siga, Moy and Proclima / Ecological Building Systems.

    Check them all out.


  • #4
    ardara1
    Closed Accounts Posts: 495 ✭✭ardara1


    There are 2 set of details that you are supposed to follow for thermal bridging

    Accredited Details (Acceptable - Ireland)
    or
    Enhanced Accredited (UK only)

    The ENhanced recommend the scratch coat before application of the thermal liner

    It can be assumed that with Accredited - you'll achieve min 7 Q50

    With Enhanced - 4 Q50

    I've asked a number of times on a number of forums - with the specialized tapes -
    what permeability did the users actually achieve? -
    Is it worth the expense?
    If you do go below 5/4 - do you want to go Mech Vent? - it's recommended


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