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Non cavity blockwork wall construction for a house

  • 22-03-2018 11:41am
    #1
    Shauny2010
    Closed Accounts Posts: 657 ✭✭✭


    Why should I bother with a cavity wall construction when nowdays they seem to be all pumped full of insulation after.
    Could I build a house using 215mm (9 inch) cavity blocks then use a 100mm insulated slab on the inside?
    Or use external insulation but I'm not sure how this is fixed to the wall or how weather proof it is
    Would a house built like this comply with building regulations??


Comments

  • #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,357 Mod ✭✭✭✭Gumbo


    Shauny2010 wrote: »
    Why should I bother with a cavity wall construction when nowdays they seem to be all pumped full of insulation after.
    Could I build a house using 215mm (9 inch) cavity blocks then use a 100mm insulated slab on the inside?
    Or use external insulation but I'm not sure how this is fixed to the wall or how weather proof it is
    Would a house built like this comply with building regulations??

    What has your engaged professional said?

    You need to de a Preliminary DEAP assessment to determine what will comply and what will not.

    A cavity wall that is pumped behaves very differently to a cavity block with an insulated board fixed to it.


  • #3
    Shauny2010
    Closed Accounts Posts: 657 ✭✭✭Shauny2010


    Haven't engaged a professional yet. I'm trying to decide on what type of build structure I can use. I am hoping to use a non cavity soild wall Insulated on the inside.
    k118-215block.png

    I hope to copy the scandinavian passive home style but instead of using timber frame I want to use solid blocks instead


  • #4
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    Shauny2010 wrote: »
    Haven't engaged a professional yet. I'm trying to decide on what type of build structure I can use. I am hoping to use a non cavity soild wall Insulated on the inside.
    k118-215block.png

    I hope to copy the scandinavian passive home style but instead of using timber frame I want to use solid blocks instead

    if you insulate internally, how do you ensure continuous insulation at junctions of floors and ceilings, or internal block walls etc.

    how do you deal with interstitial condensation which will occur between the insulation and your block wall?


  • #5
    Shauny2010
    Closed Accounts Posts: 657 ✭✭✭Shauny2010


    You have a good point about the interstitial condensation. I'm not sure how this would work out.
    I've been looking into the costings for the insulated slabs and I'm not sure if it any saving can be made. The Kingspan Kooltherm K118 sheets are really expensive coming in at around €25/m2 just for the board. Though they have the best U-values


  • #6
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    Shauny2010 wrote: »
    You have a good point about the interstitial condensation. I'm not sure how this would work out.
    I've been looking into the costings for the insulated slabs and I'm not sure if it any saving can be made. The Kingspan Kooltherm K118 sheets are really expensive coming in at around €25/m2 just for the board. Though they have the best U-values

    internal drylining, of all the construction methods standard in ireland, is the worst by far.

    i certainly wouldnt be considering it for a new build dwelling

    If you want to look at single leaf builds, certainly consider EWI.
    Possibly even look at ytongs 480mm wall (though that system is unproven here)


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