Estimating Cinder Blocks for a Garage
Building a garage with cinder blocks (CMUs) provides a fireproof, durable, and sound-dampening structure that outlasts traditional wood framing. However, because garages have large openings (like the main garage door) and often require structural reinforcement, getting an accurate block count is crucial for budgeting and permit applications.
How many blocks for a 2-car garage?
A standard 24' x 24' two-car garage with 8-foot high walls has a total perimeter of 96 feet. If you were building solid walls, you would need approximately 860 to 900 blocks. However, once you subtract the area for a 16' x 7' garage door and a standard side entry door, the net count drops to roughly 720 to 750 blocks.
Garage Build Tip
"When building a garage, ensure you account for 'corner blocks' and 'L-shaped' blocks at the edges. Also, remember that the top course of the garage wall often uses 'U-shaped' bond beam blocks to hold horizontal rebar and grout for structural roof attachment."
Steps to Calculate Garage Blocks
- Measure the Perimeter: Add the lengths of all four walls (e.g., 24 + 24 + 24 + 24 = 96 ft).
- Determine Wall Height: Standard residential garage walls are 8, 9, or 10 feet high.
- Calculate Total Area: Perimeter x Height (e.g., 96 x 8 = 768 sq ft).
- Subtract Openings: Deduct the area of the garage door, side doors, and any windows.
- Divide and Factor Waste: Divide the net area by 0.89 and add 10% for waste.