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Airtightness

  • 12-01-2011 3:55pm
    #1
    peterc14
    Registered Users, Registered Users 2 Posts: 155 ✭✭


    I know I should have thought about this earlier but my self build now has roof and windows in and I am only starting to think of airtightness.

    I have hollowcore slab but did not wrap the slab prior to installation. Is there any filler/foam that could be used to seal the where the blockwork and hollowcore meet (around perimiter) to make it completely airtight. Also for where the slabs abut each other.

    Also, there is a visible air gap at the top of the blockwork at the gable ie between where block ends and joist/roof begins... should i spray foam to fill the gap?


Comments

  • #2
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    peterc14 wrote: »
    I know I should have thought about this earlier but my self build now has roof and windows in and I am only starting to think of airtightness.

    I have hollowcore slab but did not wrap the slab prior to installation. Is there any filler/foam that could be used to seal the where the blockwork and hollowcore meet (around perimiter) to make it completely airtight. Also for where the slabs abut each other.

    Also, there is a visible air gap at the top of the blockwork at the gable ie between where block ends and joist/roof begins... should i spray foam to fill the gap?

    The foam is not airtight - especially if you cut the skin, to trim.

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  • #3
    peterc14
    Registered Users, Registered Users 2 Posts: 155 ✭✭peterc14


    galwaytt wrote: »
    The foam is not airtight - especially if you cut the skin, to trim.

    Can you recommend a similar type of product which would be airtight or a possible way around this problem?

    Thanks.


  • #4
    mickdw
    Registered Users, Registered Users 2 Posts: 23,688 ✭✭✭✭mickdw


    Without wrapping the slabs, I feel you will need to make an airtight area on the ground & seperate airtight area on first floor. I dont see how you can properly achieve airtightness with the method you are suggesting.


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