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Concrete 1st Floors ( and maybe more!!!!)

  • 16-09-2009 2:27pm
    #1
    johnwstafford
    Registered Users, Registered Users 2 Posts: 29 ✭


    Hi,

    Has anyone poured concrete floors for the first (and maybe second) floor?

    I have talked to my Architect about it and he said that I'll need to get in touch with a structural engineer.

    Does anyone have any experience with pouring/shuttering a first floor?

    After reading many threads, there seems to be precast concrete slabs which can be used - How do they work t? e.g: Is there a need to pour anything on top of these once laid? Does the underside need to be plastered? Are they joined somehow? What are they like in terms of thermal performance, sound performance

    Any info would be great, thanks!


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,169 ✭✭✭✭sydthebeat


    johnwstafford wrote: »


    1. How do they work t? e.g:
    2. Is there a need to pour anything on top of these once laid?
    3. Does the underside need to be plastered?
    4 Are they joined somehow?
    5 What are they like in terms of thermal performance, sound performance

    1. There are two type, one is complete concrete slabs called 'wideslab'. the other is similar but with holes incorporated called 'hollowcore'. both do the same thing. hollowcore may span slightly wider spans.
    2. both types require a finishing screed to be poured on top, with reinforcement incorporated. If underfloor heat is used there should also be insulation incorporated
    3. the underside will not be level. This needs to be levelled by means of either timber battens or metal suspended ceilings (my preference). It is then finished in skimed plasterboard.
    4. the thermal performance doesnt matter as they are within the buildings insulation envelope. They do act as thermally massive elements and as such store more heat than timber floors. they have excellent sound and fire proofing qualitites, which is what they are usually selected for.


  • #3
    johnwstafford
    Registered Users, Registered Users 2 Posts: 29 ✭johnwstafford


    Thanks for the feedback, greatly appreciated. I must look into this!


  • #4
    BnA
    Closed Accounts Posts: 616 ✭✭✭BnA


    Just to add to what Sys said there in relation to what your Architect said in relation to needing a structural engineer.

    A good concrete company will have an Enginner that will draw up a detailed plan of what way they would lay the slabs. They would also advise where you might need an internal block on flat or a steel beam to support the slabs


  • #5
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 18,444 Mod ✭✭✭✭DOCARCH


    No problem with concrete floors but the reason I would suugest your architect has told you to speak with a structural engineer I suspect is that the construction of the walls supporting the concrete floor would have to be looked at. Depending on spans and probably/certianly if you were looking at two concrete floors, and if building in cvaity construction, you may need a 215mm inner leaf and/or loadbearing internal walls to take weight of slab.

    Usually a sand/cement screed is poured on top of slab and timber battens and plasterboard fixed to underside of slab - just also bear in mind that often your overal floor thickness will be deeper than timber construction.


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