Screed to concrete floor

Discussion in 'Misc DIY' started by PJ, Apr 21, 2004.

  1. PJ

    PJ Guest

    Anyone know what mix should be used for sand/cement floor screed?

    Also, does the screed simply go on top of the concrete or should the
    concrete be treated with anything first?
    PJ, Apr 21, 2004
    #1
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  2. PJ

    Kalico Guest

    On Wed, 21 Apr 2004 08:41:45 +0100, "PJ"
    <> wrote:

    >
    >Anyone know what mix should be used for sand/cement floor screed?
    >
    >Also, does the screed simply go on top of the concrete or should the
    >concrete be treated with anything first?
    >

    Make sure the concrete floor is nice and wet before you start and use
    a VERY dry mix of about 5 sand, 1cement, with no lime etc. Hardly any
    water in it, AFAIK.

    Rob
    Kalico, Apr 21, 2004
    #2
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  3. PJ

    PJ Guest

    "Kalico" <> wrote in message
    news:...
    > On Wed, 21 Apr 2004 08:41:45 +0100, "PJ"
    > <> wrote:
    >
    > >
    > >Anyone know what mix should be used for sand/cement floor screed?
    > >
    > >Also, does the screed simply go on top of the concrete or should the
    > >concrete be treated with anything first?
    > >

    > Make sure the concrete floor is nice and wet before you start and use
    > a VERY dry mix of about 5 sand, 1cement, with no lime etc. Hardly any
    > water in it, AFAIK.
    >
    > Rob
    >


    I was going to make the mix sloppy so it found it's own level. If I do a dry
    mix I'll have to float it smooth & level and having never done this before I
    may cock up.
    PJ, Apr 21, 2004
    #3
  4. PJ

    Stuart Guest

    "PJ" <> wrote in message
    news:c65otq$2i0$...
    >
    > "Kalico" <> wrote in message
    > news:...
    > > On Wed, 21 Apr 2004 08:41:45 +0100, "PJ"
    > > <> wrote:
    > >
    > > >
    > > >Anyone know what mix should be used for sand/cement floor screed?
    > > >
    > > >Also, does the screed simply go on top of the concrete or should the
    > > >concrete be treated with anything first?
    > > >

    > > Make sure the concrete floor is nice and wet before you start and use
    > > a VERY dry mix of about 5 sand, 1cement, with no lime etc. Hardly any
    > > water in it, AFAIK.
    > >
    > > Rob
    > >

    >
    > I was going to make the mix sloppy so it found it's own level. If I do a

    dry
    > mix I'll have to float it smooth & level and having never done this before

    I
    > may cock up.
    >


    Depends on the thickness, if its about 10mm or less then a self levelling
    flooring compound that you pour on and it will create a thin hardwearing
    level surface. If your screed is needing to be a couple of inches thick then
    it does need to be a very dry mix (4:1 min) and levelled with a wooden
    float. If you make a wet and sloppy sand cement screed, it will be weak and
    dusty!
    Stuart, Apr 21, 2004
    #4
  5. PJ

    PJ Guest

    > Depends on the thickness, if its about 10mm or less then a self levelling
    > flooring compound that you pour on and it will create a thin hardwearing
    > level surface. If your screed is needing to be a couple of inches thick

    then
    > it does need to be a very dry mix (4:1 min) and levelled with a wooden
    > float. If you make a wet and sloppy sand cement screed, it will be weak

    and
    > dusty!


    Right. See your point. I need a 65mm screed so it's quite thick. Self
    leveller is no good because it tends to flake off (this is a garage and so
    will take some stick).
    PJ, Apr 21, 2004
    #5
  6. PJ

    Mike Taylor Guest

    "Normal screeds are above 50mm thickness up to about 75mm
    You lay them on top of the existing clean concrete.
    1st "prime the concrete with a slurry of neat cement. Just mix some cement
    with water to a sloppy creamy consistency and brush with a broom onto the
    floor
    The screed is normally 3 parts river washed sand to 1 part cement mixed
    quite dry.
    Mike Taylor, Apr 21, 2004
    #6
  7. PJ

    PJ Guest

    "Mike Taylor" <MikeT@(Removethis)tylershill.freeserve.co.uk> wrote in
    message news:c662ul$h83$...
    > "Normal screeds are above 50mm thickness up to about 75mm
    > You lay them on top of the existing clean concrete.
    > 1st "prime the concrete with a slurry of neat cement. Just mix some cement
    > with water to a sloppy creamy consistency and brush with a broom onto the
    > floor
    > The screed is normally 3 parts river washed sand to 1 part cement mixed
    > quite dry.


    Please excuse my ignorance but what is river washed sand?
    PJ, Apr 21, 2004
    #7
  8. PJ

    Stuart Guest

    "PJ" <> wrote in message
    news:c66b4p$2r1$...
    >
    > "Mike Taylor" <MikeT@(Removethis)tylershill.freeserve.co.uk> wrote in
    > message news:c662ul$h83$...
    > > "Normal screeds are above 50mm thickness up to about 75mm
    > > You lay them on top of the existing clean concrete.
    > > 1st "prime the concrete with a slurry of neat cement. Just mix some

    cement
    > > with water to a sloppy creamy consistency and brush with a broom onto

    the
    > > floor
    > > The screed is normally 3 parts river washed sand to 1 part cement mixed
    > > quite dry.

    >
    > Please excuse my ignorance but what is river washed sand?
    >


    It is widley known as "Sharp Sand", don't use Building Sand (often called
    Soft Sand) it will give a dusty finnish.
    Stuart, Apr 21, 2004
    #8
  9. PJ has brought this to us :
    > I was going to make the mix sloppy so it found it's own level. If I do a dry
    > mix I'll have to float it smooth & level and having never done this before I
    > may cock up.


    From my memory of the last time I saw it done professionally, they laid
    a matrix of 2x2 level timber to act as a guide at a spacing of about 4
    feet. As the screed starts to set, they lift the timber and fill in the
    gaps with more screed then float it smooth. They used sheets of ply on
    top of the screed to stand upon.

    --


    --

    Regards,
    Harry (M1BYT) (L)
    http://www.ukradioamateur.org
    Harry Bloomfield, Apr 21, 2004
    #9
  10. PJ

    Guest

    In article <c66b4p$2r1$>, PJ <
    ..org.uk.me.etc.com> writes
    >
    >"Mike Taylor" <MikeT@(Removethis)tylershill.freeserve.co.uk> wrote in
    >message news:c662ul$h83$...
    >> "Normal screeds are above 50mm thickness up to about 75mm
    >> You lay them on top of the existing clean concrete.
    >> 1st "prime the concrete with a slurry of neat cement. Just mix some cement
    >> with water to a sloppy creamy consistency and brush with a broom onto the
    >> floor
    >> The screed is normally 3 parts river washed sand to 1 part cement mixed
    >> quite dry.

    >
    >Please excuse my ignorance but what is river washed sand?
    >
    >

    It should be "washed river sand"
    --
    David
    , Apr 21, 2004
    #10
  11. PJ

    Mike Taylor Guest

    correct washed river sand instead of river washed sand, Slip of the old
    computer fingers when trying to type fast
    Mike Taylor, Apr 22, 2004
    #11
  12. PJ

    PJ Guest

    "Mike Taylor" <MikeT@(Removethis)tylershill.freeserve.co.uk> wrote in
    message news:c67n3p$qkb$...
    > correct washed river sand instead of river washed sand, Slip of the old
    > computer fingers when trying to type fast
    >


    Oh dear. And here's me with a ton of red building sand left over which I was
    going to use for the screed!
    PJ, Apr 22, 2004
    #12
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