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Materials for brick wall 20 m (1:5)

Short answer

Net masonry 20×0.23×3 m minus two 1.2×1.2 m openings = 13.1376 m³. Bricks (230×110×55 mm): 7018 nos. (7369 with 5% wastage). 1:5 mortar dry volume 4.3838 m³: cement 21.04 bags, sand 3.653 m³.

Calculate quantities of material required for brick wall of a building L × B × H = 20 m × 0.23 m × 3 m with 10 mm thick in 1:5 mortar. The wall contains two windows of size 1.2 m × 1.2 m. Take standard size of brick.

Net volume of masonry

  • Gross volume = 20 x 0.23 x 3 = 13.800 m³
  • Openings = 2 x 1.2 x 1.2 x 0.23 = 0.6624 m³
  • Net volume = 13.800 - 0.6624 = 13.1376 m³

Bricks

Using the standard brick 230 x 110 x 55 mm with 10 mm mortar joints, the nominal size is 240 x 120 x 65 mm.

Bricks per m3=10.240×0.120×0.065=534.19\text{Bricks per m}^3 = \frac{1}{0.240 \times 0.120 \times 0.065} = 534.19

Number of bricks = 534.19 x 13.1376 = 7018 nos. (about 7369 nos. with 5% wastage).

Mortar (1:5)

  • Volume of bricks without mortar = 7018 x 0.23 x 0.11 x 0.055 = 9.7655 m³
  • Wet mortar = 13.1376 - 9.7655 = 3.3721 m³
  • Dry mortar = 3.3721 x 1.30 = 4.3838 m³
  • Cement = 4.3838/6 = 0.7306 m³ = 1052.1 kg = 21.04 bags (50 kg)
  • Sand = 4.3838 x 5/6 = 3.653 m³

Answer: Bricks = 7018 nos.; cement = 21.04 bags (0.731 m³); sand = 3.653 m³.

✓ Answer checked by Claude Opus 5.5 (high effort)

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