How it’s calculated
Each brick plus its share of mortar fills its nominal face (specified size + joint). Modular brick is laid to a nominal 8 in × 2⅔ in face (three courses per 8 in), so:
Example: a 20 ft × 8 ft modular wall = 160 ft² × 6.75 = 1,080 bricks. With 5% waste: 1,134 bricks. Mortar with ⅜ in joints: 1.6 × 5.5 = 8.8 ft³ net; at 37 bricks per 80 lb bag, ⌈1,134 ÷ 37⌉ = 31 bags.
Counts and mortar volumes match Brick Industry Association Technical Note 10, Table 4 (running bond, single wythe). Patterns with header courses (Flemish, English bond) need more brick.
Frequently asked questions
How many bricks per square foot?
For standard modular brick with a ⅜ in joint, 6.75 bricks per square foot (675 per 100 ft²). Norman brick takes 4.5 and utility brick 3 per square foot.
How many bricks are in 1,000 square feet of wall?
About 6,750 modular bricks, plus at least 5% for breakage and cutting, so order roughly 7,100.
How much mortar do I need for 1,000 bricks?
BIA Table 4 gives about 8.1 ft³ of mortar per 1,000 modular bricks with ⅜ in joints, before the recommended 15–25% mortar waste. Masons’ rule of thumb is 8 bags of masonry cement per 1,000 modular brick.
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Sources
- Technical Note 10: Dimensioning and Estimating Brick Masonry (Table 4) — Brick Industry Association
- QUIKRETE Mortar Mix product data sheet (yield per bag) — QUIKRETE Companies
Formulas are taken from the free public references above. Results are provided “as is” for informational and educational purposes only. See our disclaimer.
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