How is the number of bricks per m3 of brickwork found in this analysis?

1 divided by the volume of one brick including its mortar joint (0.252 x 0.142 x 0.077 m)

1 divided by the volume of the nominal brick 0.24 x 0.13 x 0.065 m

Volume of the wall divided by the volume of mortar

Number of bricks in one course multiplied by 10

How is the wet mortar needed per m3 of brickwork obtained?

1 m3 minus the volume of the bricks alone (362.9 x 0.002028 m3), giving 0.2640 m3

Equal to the volume of bricks, 0.736 m3

1 m3 plus the volume of the bricks

One-tenth of the brickwork volume taken as a thumb rule

For 1:5 mortar, how are cement and sand quantities found from the wet mortar?

Multiply wet mortar by 1.27 for dry volume, then take 1/6 as cement and 5/6 as sand

Take 1/5 as cement and 4/5 as sand of the wet volume

Take 1/5 as cement and 5/5 as sand of the dry volume

Use the wet mortar volume directly with 1/6 and 5/6

In the final total, how are overhead (15%) and profit (10%) applied?

Both are taken on the direct cost (14,089.10) and added to it, giving 17,611.38 per m3

Profit is taken on direct cost plus overhead

They are taken only on the material cost

They are deducted from the direct cost

2068 Baisakh (old course) · 4 marks

Rate analysis: brick masonry 1:5, superstructure

Short answer

Brick 240x130x65 mm, 12 mm mortar yields 363 bricks/m³. Per m³: bricks 362.9, cement 1.609 bags, sand 0.2794 m³. Direct cost NPR 14,089.10; total with 15% overhead and 10% profit = NPR 17,611.38 per m³.

Prepare an analysis of rate of brick masonry in (1:5) cement mortar in super structure. Assume size of brick 240 × 130 × 65 mm and thickness of mortar joint is 12 mm.

Rates and labour norms below are illustrative (DUDBC-style norms; use the current District Rate and norms of the project area for a real estimate): cement NPR 1,000/bag, sand NPR 3,500/m³, 20 mm aggregate NPR 4,500/m³, skilled labour NPR 1,500/day, unskilled labour NPR 1,100/day, water lump sum, contractor's overhead 15% and profit 10% on direct cost (VAT excluded). Brick is taken at NPR 18 each.

Quantities per m³ of brickwork

Brick with mortar $= 0.252 \times 0.142 \times 0.077 = 2,755\times10^{-6}$ m³; bricks per m³ $= 362.9$
Brick volume $= 0.24 \times 0.13 \times 0.065 = 2,028\times10^{-6}$ m³; wet mortar $= 1 - 362.9\times2,028\times10^{-6} = 0.2640$ m³
Dry mortar $= 1.27 \times 0.2640 = 0.3353$ m³; cement $= 1/6 \times 0.3353 = 0.0559$ m³ $= 1.609$ bags; sand $= 5/6 \times 0.3353 = 0.2794$ m³
Labour (superstructure, assumed norm): mason 1.6 days, labourer 2.2 days per m³.

Analysis

Item	Qty	Unit	Rate (NPR)	Amount (NPR)
Bricks 240 × 130 × 65 mm	362.9	no	18.00	6,532.20
Cement	1.609	bag	1,000.00	1,609.00
Sand	0.2794	m³	3,500.00	977.90
Skilled labour (mason)	1.6	day	1,500.00	2,400.00
Unskilled labour	2.2	day	1,100.00	2,420.00
Water and scaffolding (lump)	1	LS	150.00	150.00
Direct cost				14,089.10
Contractor's overhead @ 15%				2,113.37
Contractor's profit @ 10%				1,408.91
Total (rate per m³)				17,611.38

Rate of 1:5 brickwork in superstructure = NPR 17,611.38 per m³.

✓ Answer checked by Claude Opus 5.5 (high effort)

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Rate analysis: brick masonry 1:5, superstructure

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