---
title: "Materials: 100 m² plaster 1:6, 100 m³ PCC 1:2:4"
subject: "Estimating and Costing"
chapter: 4
key: "semester_7/estimating_and_costing:materials-plaster-100m2-pcc-100m3-u"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/materials-plaster-100m2-pcc-100m3-u
site: BCT Engineering
---

# Materials: 100 m² plaster 1:6, 100 m³ PCC 1:2:4

Estimating and Costing · Chapter 4: Analysis of Rates

- Asked in: 2066 Bhadra (old course), 10 marks
- Video: [How to calculate material for 1 cubic meter of concrete | Engineering Tactics](https://www.youtube.com/watch?v=RUawU2lOrD8) — ENGINEERING TACTICS
- 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-100m2-pcc-100m3-u
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-4

## Question

Calculate the quantities of material required for following works. i) 100 m² cement sand plaster 12 mm thick in (1:6) ii) 100 m³ P.C.C. (1:2:4).

## Short answer

For 100 m2 12 mm plaster (1:6), wet mortar 1.2 m3, dry 1.524 m3: cement 6.27 bags, sand 1.31 m3. For 100 m3 PCC (1:2:4), dry volume 154 m3: cement 633.6 bags, sand 44 m3, aggregate 88 m3.

## Answer

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

#### (i) 100 m² of 12 mm plaster (1:6)

- Wet mortar $= 100.0 \times 0.0120 = 1.2000$ m³; dry volume $= 1.27 \times 1.2000 = 1.5240$ m³
- Cement $= 1/7 \times 1.5240 = 0.2177$ m³ $= 6.27$ bags
- Sand $= 6/7 \times 1.5240 = 1.3063$ m³

#### (ii) 100 m³ of PCC (1:2:4)

- Wet volume $= 100.000$ m³; dry volume $= 1.54 \times 100.000 = 154.000$ m³ (sum of ratio $= 7$)
- Cement $= 1/7 \times 154.000 = 22.000$ m³ $= 22.000 \times 28.8 = 633.6$ bags (50 kg)
- Sand $= 2/7 \times 154.000 = 44.000$ m³
- Coarse aggregate $= 4/7 \times 154.000 = 88.000$ m³

**Answer: (i) cement 6.3 bags, sand 1.31 m³. (ii) cement 633.6 bags, sand 44.00 m³, aggregate 88.00 m³.**

## Check yourself

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

1. What is the wet mortar for 100 m2 of 12 mm plaster?
   A. 100 x 0.12 = 12 m3
   B. 100 x 0.012 = 1.20 m3
   C. 100 x 0.012 x 1.27 = 1.524 m3
   D. 100 x 0.0012 = 0.12 m3
   Answer: B. Wet volume = area x thickness; 1.27 is applied afterwards to get dry volume. (Key point: Plaster mortar volume)

2. What are cement and sand for 100 m2 of 12 mm plaster in 1:6?
   A. Cement 1/6 x 1.524 m3; sand 5/6
   B. Cement 1/7 x 1.2 m3; sand 6/7 x 1.2 m3
   C. Cement 1/7 x 1.524 = 0.2177 m3 (6.27 bags); sand 6/7 x 1.524 = 1.306 m3
   D. Cement 1/6 x 1.2 m3; sand 6/6 x 1.2 m3
   Answer: C. Dry mortar 1.524 m3 is split in the ratio 1:6 using sum 7. (Key point: Plaster 1:6 materials)

3. For 100 m3 of PCC 1:2:4, how much cement is required?
   A. 1/4 x 154 = 38.5 m3
   B. 1/7 x 100 = 14.3 m3
   C. 1/6 x 154 = 25.7 m3
   D. 1/7 x 154 = 22.0 m3 = 633.6 bags
   Answer: D. Sum of ratio is 1+2+4 = 7; dry volume 154 m3; 22 x 28.8 = 633.6 bags. (Key point: PCC 1:2:4 cement)

4. What are sand and aggregate for 100 m3 of PCC 1:2:4?
   A. Sand 44.0 m3 and aggregate 88.0 m3
   B. Sand 88.0 m3 and aggregate 44.0 m3
   C. Sand 28.6 m3 and aggregate 57.1 m3
   D. Sand 22.0 m3 and aggregate 44.0 m3
   Answer: A. 2/7 x 154 = 44 and 4/7 x 154 = 88. (Key point: PCC 1:2:4 sand and aggregate)

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