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Solid slabs on first floor and airtightness

  • 07-07-2015 10:59pm
    #1
    murphy31ie
    Registered Users, Registered Users 2 Posts: 62 ✭✭


    Hi,
    We have made the mistake of thinking as we have solid slabs on the first floor there was no need to wrap the ends with a membrane. We are ready to scratch coat all the walls now (airtight membrane installed, windows and doors all taped), anything we can do now to improve the airtightness in relation to the slabs?


Comments

  • #2
    hexosan
    Registered Users, Registered Users 2 Posts: 1,740 ✭✭✭hexosan


    Short answer is no not really


  • #3
    Curious Geroge
    Registered Users, Registered Users 2 Posts: 1,017 ✭✭✭Curious Geroge


    murphy31ie wrote: »
    Hi,
    We have made the mistake of thinking as we have solid slabs on the first floor there was no need to wrap the ends with a membrane. We are ready to scratch coat all the walls now (airtight membrane installed, windows and doors all taped), anything we can do now to improve the airtightness in relation to the slabs?

    From the bottom up you can scratch coat right to the base of the hollowcore. You can tape the joint before putting in the ceiling but that might not be worth the cost. On the floor before you lay your insulation on the hollowcore, you can tape or you could put the insulation and screed in and then tape it. I would recommend the latter as the screed contains alot of moisture and may ruin the taping. It wont be as good as wrapping the hollowcore but it would help. I did'nt see the importance of it and had the hollowcore sealing at each end when manufactured and then bedded it in concrete; how expensive is the wrap?


  • #4
    hexosan
    Registered Users, Registered Users 2 Posts: 1,740 ✭✭✭hexosan


    The issue isn't just the cores of the slabs leaking air you have to seal the gaps between each slab. Simply plugging the ends won't do this.

    Solitex roll halved does 100m of slab wrapped @ between €180-€200 a roll.


  • #5
    murphy31ie
    Registered Users, Registered Users 2 Posts: 62 ✭✭murphy31ie


    The slabs are not hollowcore, they are solid slabs, but yeah Curious George we will be scratching right to the base and good point on pouring screed over the tape, we will have a look at taping after the screed goes in. Hexosan, the gaps between the slabs were filled in when they were put in, but I am guessing this is standard and there will still be gaps. Any point going round trying to patch up any gaps?


  • #6
    Curious Geroge
    Registered Users, Registered Users 2 Posts: 1,017 ✭✭✭Curious Geroge


    murphy31ie wrote: »
    The slabs are not hollowcore, they are solid slabs, but yeah Curious George we will be scratching right to the base and good point on pouring screed over the tape, we will have a look at taping after the screed goes in. Hexosan, the gaps between the slabs were filled in when they were put in, but I am guessing this is standard and there will still be gaps. Any point going round trying to patch up any gaps?

    Maybe; I'd suggest using tile adhesive to do this. I see alot of people using this to bed the electric sockets and ducting (bedding the chase).


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