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Wrong size cavity in footings!!

  • 24-04-2008 12:14am
    #1
    SillyMonkey
    Registered Users, Registered Users 2 Posts: 54 ✭✭


    Checked the footings after the brickie had finished. He left a 100mm cavity in between the two rows of 4" blocks instead of 120mm which is on the plans.

    I'm planning on using 80mm rigid insulation and 40mm cavity.

    Any suggestions as to what to do since if I want a 120mm cavity all the way up the blocks won't be aligned with the footings.

    I have a few thoughts (bar screaming at the brickie) but would like to hear your suggestions.

    BTW when I asked him about it he said 100mm was the standard. I said I wasn't building a standard house and it was clearly on the plans. Was greeted with silence.


Comments

  • #2
    kkelliher
    Registered Users, Registered Users 2 Posts: 1,583 ✭✭✭kkelliher


    Screaming at the brickie is the only answer if you want it done right.

    You cant have a 120mm cavity if the footings are not correct. You cannot just widen the wall as you go up the building.

    You would be better getting it redone now if it is a 120mm cavity you want. If it was on the drawing you gave him then its his problem.


  • #3
    Mellor
    Registered Users, Registered Users 2 Posts: 39,900 ✭✭✭✭Mellor


    100mm isn't standard, not anymore.

    Also, are you refering to the whole rising wall from the foundations, or just the lower courses. How much to be re-done


  • #4
    smashey
    Registered Users, Registered Users 2 Posts: 21,676 ✭✭✭✭smashey


    If it was me, I'd get him to re-do it.


  • #5
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    YES, THIS IS A NO-BRAINER... HES DONE IT INCORRECTLY, GET HIM TO DO IT AGAIN....

    sorry about the caps again... i must learn to type while looking at the screen.... ;)


  • #6
    muffler
    Registered Users, Registered Users 2 Posts: 46,547 ✭✭✭✭muffler


    sydthebeat wrote: »
    YES, THIS IS A NO-BRAINER... HES DONE IT INCORRECTLY, GET HIM TO DO IT AGAIN....

    sorry about the caps again... i must learn to type while looking at the screen.... ;)

    YES, THIS IS A NO-BRAINER... HES DONE IT INCORRECTLY, GET HIM TO DO IT AGAIN.... :D


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  • #7
    Builderfromhell
    Registered Users, Registered Users 2 Posts: 1,570 ✭✭✭Builderfromhell


    I once had footings complete for house when owner decided they no longer wanted a timber frame house but opted for a concrete block house with cavity of course.
    we decided to add a block to the external leaf so as to give bearing for the new wider cavity. Original cavity construction was 100 block, 50mm gap and 100mm block, new cavity 100mm internal, 110mm gap, 100mm external block and immediately another 100mm block.

    Alternatively we had considered filling gap between external wall and trench with concrete. This could have been done when floor slab was being poured.

    BTW, I have always understood 110mm gap to be the norm. I should mention I rarely build block houses. If this is correct then the OP could solve his problem by simply offsetting the next row of blocks by 5mm on each leaf. I believe that is acceptable.


  • #8
    Builderfromhell
    Registered Users, Registered Users 2 Posts: 1,570 ✭✭✭Builderfromhell


    Just re-read my post and realised it doesn't make sense.
    we added a 100mm block to existing 100mm block 50mm cavity 100mm block.
    That gave us a 200mm wide outer wall 50mm cavity and 100mm inner wall
    above DPC we widened cavity and ended up with 100mm outer wall, 110mm cavity and 100mm inner wall.


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