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infill slab - need to raise garage floor to house slab level

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  1. #1
    Apprentice (new member)
    Join Date
    Jun 2012

    Default infill slab - need to raise garage floor to house slab level

    Hi i am going to start renovating my low set brick home and the internal single garage slab is 80mm lower than the rest of the house.

    The outer wall is single brick with brick pillar at 1800 centres.

    I want to bring the garage slab up to house slab level, frame and gyprock, to add another bedroom.

    Do i just lay rio then concrete? Do i need expansion foam or a gap around edges?

    It currently has a tiled floor, does this need to come up or can i concrete over the top?

    Thanks in advance

  2. #2
    2K Club Member barney118's Avatar
    Join Date
    Jan 2008


    Check with your council first, changing a garage to habitable room you will most likely need approval (more for resale and other issues). Check to see if you have termimesh in the brickwork and DPC these are the first obstacles you need to consider. Does the current slab have a membrane under? Do you have a copy of the house plans?

  3. #3
    Old Chippy 6K
    Join Date
    Mar 2007


    and insurance is also an issue if you have an unapproved habitable area in regular use (like a bedroom). If it is for a 'temporary' need such as a recreation area or kids playroom, you could do it by simply building a new floor on top of a timber frame over a waterproof membrane (builders plastic - bring it up the sides too by 200-300mm) directly onto the existing floor. Frame up using some 60x45 treated pine and cover with structafloor/ yellowtongue. Leave a gap around the edges of say25mm and use 70x35 framing for walls. Use sisalation style foil wrap facing the gap and then batts then plasterboard. Finished ceiling height should be 2.4m or more too although again for a temporary structure you could get away with 2.1. If you sell you will have an unapproved alteration - you can quickly remove it or tell the buyer it is being sold as is.

    It is good to remember that although rules about construction of habitable and non-habitable parts of a residence the rules are less clear and even less enforced regarding your use of various parts of your residence. Like sheds and such like - if you do not upset neighbours and do not do anything outrageous then a variety of uses can be made of all sorts of areas - and are all the time. For example it is common for teenagers to move into a basement or a garage or even a shed - sometimes with some pretty major modifications. I know of others who have parked a caravan in their yard for a few years to allow some independence (for the parents & the offspring!). These are rarely a problem unless something dumb is done such as renting out or installing an illegal fireplace - or again the teenager upsets the neighbours so draws attention to the situation. This is what is called common sense approach.
    Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.

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