Accurately estimating masonry materials prevents costly mid-job supply runs and minimizes waste. The key is knowing the coverage rate of your chosen unit and properly accounting for mortar joints and openings.
CMU Block vs. Standard Brick
CMU (Concrete Masonry Unit) — Standard 8×8×16 block covers 1.125 sq ft of wall face per unit (including mortar joints)
Standard Modular Brick — 3⅝×2¼×7⅝ brick, approximately 6.75 bricks per square foot of wall face
CMU is faster to lay and cheaper per square foot for structural walls
Brick is preferred for veneer, appearance, and thin non-structural walls
Mortar Types Explained
Type N — General purpose, medium strength (750 PSI). Best for above-grade exterior and interior walls
Type S — High strength (1,800 PSI). Required for below-grade walls, retaining walls, and high-wind regions
Type M — Maximum strength (2,500 PSI). Used for foundations, below-grade, and heavy load-bearing walls
All types require approximately 200 lbs of sand per 80 lb bag of mortar mix
Mortar Coverage Rates
CMU Block: approximately 7 bags of 80 lb mortar per 100 blocks (⅜" joints)
Standard Brick: approximately 14 bags of 80 lb mortar per 1,000 bricks
Thicker joints or face shell bedding only will affect mortar quantities
Reinforcement Requirements
Vertical rebar (#4 or #5) every 4 feet on center is standard residential practice
Horizontal bond beam reinforcement every 4 feet of height with #4 rebar
Wall ties (corrugated metal strips) required at 32" OC horizontally, every other course vertically
Seismic zones may require rebar every 24"–32" OC both directions
Grout-filled cells are required wherever vertical rebar is placed
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