Plastering

Cement mortar for plaster

Wall lengthHeight (or width)No. of such facesnosCeiling area to plaster (leave 0 if none)Deduct openingsThickness

Cement

bags

Net area plastered: 0 m²
Wet mortar: 0 m³
Dry mortar (1:5): 0 m³
Sand: 0 m³
Water (approx.): 0 L

Mark

Quantitynos

How we got this

1
Net plaster area
A = Length × Height × No. of faces + Ceiling − Openings
= 0 × 0 × 1 + 0 = 0 − 0
= 0 m²
Ceilings take a 6 mm coat on site — if you plaster one, run it separately with 6 mm thickness for an exact figure.
2
Wet mortar volume
V = Area × Thickness
= 0 m² × 0 mm (0 m)
= 0 m³
3
Dry volume
Dry = Wet × 1.27
= 0 × 1.27
= 0 m³
Voids in loose sand close up when the mortar is mixed and pressed on.
4
Cement (1:5, sum = 6)
Cement = Dry × 1/6 ÷ 0.035
= 0 × 1/6 = 0 ÷ 0.035
= 0 bags
5
Sand
Sand = Dry × 5/6
= 0 × 5/6
= 0 m³

The theory behind it

Method used: Surface-area method with dry-volume factor 1.27 — IS 1661 plastering practice

Plaster is a thin layer of mortar: volume = area × thickness. That wet volume is increased by 27% to get the dry material, then split by the mix ratio. 12 mm is standard for internal walls, 15–20 mm for external, 6 mm for ceilings.

Assumptions used

•Mortar mix 1 : 5, dry-volume factor 1.27.
•Cement bag = 50 kg = 0.035 m³.
•Area entered is the net plastered face; deduct openings over 0.5 m².
•Add 15–20% for uneven substrate and rough finishing.

Codes & references

IS 1661:1972 — Cement and cement-lime plaster finishes
IS 2402:1963 — External rendering

History

Estimates for guidance only. Confirm quantities with your site engineer.