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Screed on timber first floor

  • 13-02-2010 6:14pm
    #1
    bdoo
    Closed Accounts Posts: 574 ✭✭✭


    Hi all,

    Finally got the planning sorted and gearing up to get started shortly. Going timber frame, looking at putting a screed on the first floor.

    Has anyone here got this in their house or know anyone with it, is it worthwhile?

    Cheers,


Comments

  • #2
    mickdw
    Registered Users, Registered Users 2 Posts: 23,466 ✭✭✭✭mickdw


    I was involved with one timber frame build where there was a screed poured for underfloor heating on the first floor.
    The timber frame company need to be informed of this obviusly so that they will factor in the loadings from the screed plus the extra height required.
    Turned out very well from a heating & soundproofing point f view


  • #3
    bdoo
    Closed Accounts Posts: 574 ✭✭✭bdoo


    thanks mickdw,

    we have all the design end sorted alright glad to hear it works well cos it costs a nice few quid


  • #4
    lynchysparks
    Closed Accounts Posts: 16 ✭lynchysparks


    its well worth the effort great for underfloor heating and sound if the right screed is use you can get a lovely smooth and level finished all in one go i have worked on over 20 houses with pumped in screeded floors and there a class finish .


  • #5
    jamurphmes
    Closed Accounts Posts: 1 ✭jamurphmes


    Hi, just reading your comments about first floor screeds. I am going to do the same just in a solid block house. I plan to put 25mm insulation boards on top of the flooring boards, then the underfloor heating and then 65mm screed.
    What is the best type of flooring boards to use? A friend of mine used shuttering ply and attached underfloor heating directly to the ply and then screed. He had expanding foam already between joists.


  • #6
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    For this application a "flo" screed is best not least because you can get the thickness down to 40mm .

    Less weight on the structure
    Faster to heat up

    This is one of many types available
    http://www.youtube.com/watch?v=5WOAPU2PiQc


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  • #7
    onq
    Closed Accounts Posts: 435 ✭✭onq


    jamurphmes wrote: »
    Hi, just reading your comments about first floor screeds. I am going to do the same just in a solid block house. I plan to put 25mm insulation boards on top of the flooring boards, then the underfloor heating and then 65mm screed.
    What is the best type of flooring boards to use? A friend of mine used shuttering ply and attached underfloor heating directly to the ply and then screed. He had expanding foam already between joists.

    It sounds like you have a timber first floor construction.

    Make sure you take on board Mickdw's comments about floor loading because adding significant extra dead weight to a timber first floor construction may require you to increase the specification of the supporting joists.

    The width may be okay, but typically they may need to be of greater depth and possibly more closely spaced with more bracing.

    You should get a competent engineer to check the span/load/joist calculations and sign off on the joist specification allowing not only for the weight of screed but also for the water in the pipes etc.

    Raising up the FFL by so much together with the increased joist depth will require you to check the compliance of your window sill heights, doors/frames and stairs and landing/room threshold details.

    This where at design stage it pays to have an extra 150-300mm head height to play with on the ground floor over and above the normal 2400mm, even if you weren't after extra height for effect and were trying to minimise costs.

    FWIW

    ONQ.


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