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cavity block or cavity wall

  • 03-11-2007 11:45pm
    #1
    tomgar
    Closed Accounts Posts: 8 ✭


    Hi.
    I'm considering buying a 7 year old dormer bungalow. The original plans show the walls as cavity walls (ie inner and outer leaves). However I suspect that it is a cavity block wall since there is insulation (fibre glass/moisture membrane/dry lined slab) on the inside. Is there anyway to definitively tell what type of walls these are?


Comments

  • #2
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    tomgar wrote: »
    Hi.
    I'm considering buying a 7 year old dormer bungalow. The original plans show the walls as cavity walls (ie inner and outer leaves). However I suspect that it is a cavity block wall since there is insulation (fibre glass/moisture membrane/dry lined slab) on the inside. Is there anyway to definitively tell what type of walls these are?

    7 yrs old: prolly not CB. prolly uninsulated CW

    are the electric sockets fitted to the DL?.

    if so remove one of them and bore a small hole (8mm) through the block at the back till u reach the cavity


  • #3
    tomgar
    Closed Accounts Posts: 8 ✭tomgar


    Hi Thanks for that. Yes the sockets are fitted to the DL. I will try that. Some people have been telling me that the thickness of the wall indicates a CB. I measured the thickness from inside to outside (from dry dash on the outside to dry line on the inside and got about 12.5 inches.


  • #4
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    tomgar wrote: »
    Hi Thanks for that. Yes the sockets are fitted to the DL. I will try that. Some people have been telling me that the thickness of the wall indicates a CB. I measured the thickness from inside to outside (from dry dash on the outside to dry line on the inside and got about 12.5 inches.

    when u take off the socket u will know how thick the DL is.

    when drilling keep the bit away from the glass fibre, it can get wrapped around it v quickly.

    It may be CB if it is a one off self build out in the stykes.

    since u know waht a CB is like then u may have to drill a few holes to avoid the continuous sections: take off a double socket


  • #5
    Mellor
    Registered Users, Registered Users 2 Posts: 39,901 ✭✭✭✭Mellor


    In an uninsulated wall the thickness will tell, but if drylined the total will be around 300mm, well just over.

    Get into the attic, it may be possible to see the blocks from the top at the eaves or top of gable.


  • #6
    muffler
    Registered Users, Registered Users 2 Posts: 46,550 ✭✭✭✭muffler


    Screwing off the flap/grill on an extractor vent may help


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