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Materials for brick wall, two windows 1.5 m

Short answer

Net volume after openings is 5.865 m3. Using average brick nominal size 242x127x67 mm with 12 mm mortar, quantities: bricks 2848 nos., cement 10.74 bags (0.373 m3), sand 1.865 m3.

Find out quantities of materials required for brick wall of size (10 m × 3 m × 0.23 m) which has two windows of size (1.5 m × 1.5 m). Take average size of brick (230 mm × 115 mm × 55 mm), mortar thickness of 12 mm and mortar of (1:5) cement sand ratio.

Net volume of masonry

  • Gross volume = 10 x 0.23 x 3 = 6.900 m³
  • Openings = 2 x 1.5 x 1.5 x 0.23 = 1.0350 m³
  • Net volume = 6.900 - 1.0350 = 5.8650 m³

Bricks

Using the average brick 230 x 115 x 55 mm with 12 mm mortar joints, the nominal size is 242 x 127 x 67 mm.

Bricks per m3=10.242×0.127×0.067=485.63\text{Bricks per m}^3 = \frac{1}{0.242 \times 0.127 \times 0.067} = 485.63

Number of bricks = 485.63 x 5.8650 = 2848 nos. (about 2991 nos. with 5% wastage).

Mortar (1:5)

  • Volume of bricks without mortar = 2848 x 0.23 x 0.115 x 0.055 = 4.1431 m³
  • Wet mortar = 5.8650 - 4.1431 = 1.7219 m³
  • Dry mortar = 1.7219 x 1.30 = 2.2384 m³
  • Cement = 2.2384/6 = 0.3731 m³ = 537.2 kg = 10.74 bags (50 kg)
  • Sand = 2.2384 x 5/6 = 1.865 m³

Answer: Bricks = 2848 nos.; cement = 10.74 bags (0.373 m³); sand = 1.865 m³.

✓ Answer checked by Claude Opus 5.5 (high effort)

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