Zvidhinha nepurasita
Plaster calculator
This calculator works out the cement and pit sand needed to plaster walls. Enter the wall area (or the room size, and it works the area out), the plaster thickness and the mix, and it gives you bags of cement and tonnes of pit sand.
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.
In Zimbabwe, plaster is mixed with pit sand, not river sand: its finer grain gives a smoother finish and holds water better while the plaster cures. A typical internal plaster is about 12 to 15 mm thick in a 1:5 mix; external work is usually a little thicker and a little stronger. Walls that are badly out of line need more, which is why the waste allowance is there.
If you plan a skim coat over the plaster for a smooth paint finish, the Skimlite calculator works that out separately.
Mashandiro ayo
- Area = wall area × sides plastered, less openings (for a room, the perimeter × height).
- Wet volume = area × thickness. Dry volume = wet volume × 1.33, because sand and cement shrink when water is added.
- Cement = dry volume ÷ (1 + sand parts), at 28.8 bags of 50 kg per m³. Pit sand = cement volume × sand parts, at 1.5 tonnes per m³.
Zvainofungidzira
- Ceilings are not included; plasterboard ceilings are skimmed rather than plastered.
- Bonding agents and waterproofing additives are not included.
Mibvunzo inowanzobvunzwa
How thick should plaster be?
About 12 to 15 mm on internal brick walls and 15 to 20 mm outside. Much thicker than 20 mm in one coat tends to sag and crack; uneven walls are better dubbed out first.
How many square metres does a bag of cement plaster?
At 15 mm thick in a 1:5 mix, one 50 kg bag plasters roughly 9 to 10 m², before waste. A 1:4 mix covers about 8 m². Uneven walls take noticeably more.
Can I use river sand for plaster?
It is done, but the finish is rougher and it is more prone to crazing. Pit sand is the usual choice for plaster and mortar in Zimbabwe.
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.