---
title: "Materials: 12 mm plaster 1:6 per 10 m²"
subject: "Estimating and Costing"
chapter: 4
key: "semester_7/estimating_and_costing:materials-plaster-12mm-1-6"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/materials-plaster-12mm-1-6
site: BCT Engineering
---

# Materials: 12 mm plaster 1:6 per 10 m²

Estimating and Costing · Chapter 4: Analysis of Rates

- Asked in: 2075 Asoj, 4 marks
- Video: [Cement and Sand calculation in plastering work 1:6 Ratio ।। Civil engineering technical video](https://www.youtube.com/watch?v=AcbTfzwU0oc) — CIVIL ENGINEER MUNTAZIR
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/materials-plaster-12mm-1-6
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-4

## Question

Prepare quantities of material required for 12 mm thick (1:6) cement plastering per 10 m² in brick wall.

## Short answer

For 10 m² of 12 mm plaster in 1:6 mortar, wet volume 0.12 m³, dry volume 0.1524 m³. Cement needed: 0.63 bags (0.0218 m³); sand: 0.131 m³.

## Answer

Assumptions: dry volume = 1.54 × wet volume for concrete and 1.27 × wet volume for mortar; 1 m³ of cement = 28.8 bags of 50 kg; no wastage is added.

**12 mm plaster 1:6 per 10 m²**
- Wet mortar $= 10.0 \times 0.0120 = 0.1200$ m³; dry volume $= 1.27 \times 0.1200 = 0.1524$ m³
- Cement $= 1/7 \times 0.1524 = 0.0218$ m³ $= 0.63$ bags
- Sand $= 6/7 \times 0.1524 = 0.1306$ m³

**Answer per 10 m²: cement = 0.63 bags (0.0218 m³); sand = 0.131 m³.**

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Wet mortar for 10 m^2 of 12 mm plaster?
   A. 0.1524 m^3
   B. 0.1200 m^3
   C. 0.012 m^3
   D. 1.2 m^3
   Answer: B. 10 x 0.012 = 0.12 m^3. (Key point: Wet mortar)

2. Dry volume?
   A. 0.1524 m^3 (1.27 x 0.12)
   B. 0.1848 m^3 (1.54)
   C. 0.12 m^3
   D. 0.0945 m^3
   Answer: A. Mortar factor is 1.27. (Key point: Dry mortar)

3. Cement for 1:6?
   A. 1/6 x 0.1524
   B. 1/7 x 0.12
   C. 6/7 x 0.1524
   D. 1/7 x 0.1524 = 0.0218 m^3 = 0.63 bags
   Answer: D. Sum 7. (Key point: Cement)

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