screed

[limerockconstruction]

Evening all,

Just got on to a job where the customers ground - workers have got the concrete in at the wrong level. In fairness I think they've just misread the drawings slightly, however, with the insulation i've got it looks like i've only got room for a 50-55mm S&C screed - is this enough?

 

[noseall]

Is the insulation going on top of the slab, i.e. directly underneath the screed?

 

[limerockconstruction]

Yes mate - All slab work done by others - i'm on shell and internals - but the make up was type 1, DPM, slab, Celotex (150mm) and then screed

 

[freddiemercurystwin]

Bloody hell, what the hell is 150mm celotex doing in there? Get that down to under 100mm and it'll still comply, job's a good'un!

 

[limerockconstruction]

Cellotex is on site already!! I had just assumed that it would all work as per the plans.

 

[noseall]

We tend to work on 75mm or above.

55mm is very lean on an un-bonded screed. A bit too lean me thinks. It will not stand impact well and could 'curl' being so thin.

Is there UFH too?

 

[limerockconstruction]

I always aim for 75mm. There's no UFH in this one.

Is 65mm acceptable?

 

[noseall]

I always aim for 75mm. There's no UFH in this one.

Is 65mm acceptable?

Better.

Who is doing the screeding?

 

[limerockconstruction]

I usually use my firm of spreads - a decent mob from down this way - the only thing is there never that comital with advice, hence me canvasing for opinion.

 

[limerockconstruction]

Bloody hell, what the hell is 150mm celotex doing in there? Get that down to under 100mm and it'll still comply, job's a good'un!

I've just done some measurements and I think I could get away with 100mm - i've got a standard construction (300mm therm/conc) extension with 100mm full fill in the walls and a flat roof deck with 120mm all over. small roof lantern and small french doors in?

Would 100mm work here?

 

[SimonScreedSpecifier]

I've specified Ronafix SBR for such jobs.

See their product:
http://www.screeds.ronacrete.co.uk/screeds/polymer/ronafix-pre-packed-floating-screed-35mm.

Minimum 35mm onto insulation.