Kongiri nesimbi
Floor screed calculator
A screed is the smooth, level layer of sand and cement laid over a concrete slab before tiles, vinyl or a polished finish. This calculator works out the cement and river sand for it from the floor area and thickness.
Zvaunoda
Calculator iyi inoverenga nhamba mubrowser yako, izvo zvinoda kuti JavaScript ivhurwe. Nzira iri pazasi inoratidza kuti ungazviverenga sei nemaoko.
Fungidziro dzekuronga nekuita bhajeti. Huwandu chaihwo hunoenderana nenzvimbo nebasa, saka bvunza muvaki wako usati waodha.
Screeds are made with river sand, because its coarser grain gives the strength a floor needs; pit sand makes a weak, dusty screed. A bonded screed on a clean slab is usually 25 to 40 mm thick; a floating screed over insulation or a membrane needs at least 50 mm. The usual mix is 1:4 cement to river sand, mixed fairly dry so it can be compacted.
If you know the room size rather than the area, multiply length by width for each room and add them together.
Mashandiro ayo
- Wet volume = area × thickness.
- Dry volume = wet volume × 1.33.
- Cement = dry volume ÷ (1 + sand parts), at 28.8 bags per m³. River sand = cement volume × sand parts, at 1.6 tonnes per m³.
Zvainofungidzira
- The slab is reasonably level; a slab that falls a lot over the room needs a thicker average screed.
Mibvunzo inowanzobvunzwa
How thick should a floor screed be?
About 25 to 40 mm when bonded directly to a clean slab, and at least 50 mm when it floats on a membrane or insulation.
How long before I can tile on a screed?
Allow about a day per millimetre for the first 40 mm as a rule of thumb, in good drying weather. Tiling too early traps moisture and lifts tiles.
Can I use pit sand for screed?
It is not recommended. Pit sand gives a softer, dustier surface that breaks up under furniture and foot traffic.
Unoda huwandu chaihwo hwepurani yako?
Calculator inoshanda nemadziro rimwe kana slab imwe panguva. Bill of quantities inoshanda nemadhirowingi ako chaiwo uye inoverenga zvese, ndizvo zvinoshandiswa nevavaki kuisa mitengo uye zvinokutadzisa kutenga kaviri.