Frequently Asked Questions
How many blocks are in a square foot?
A standard 16 by 8 inch CMU face covers about 0.889 square feet, which works out to roughly 1.125 blocks per square foot of wall.
How much mortar will I need?
Plan on about three 80 pound bags of mortar mix per 100 blocks. Joint thickness and your masons technique change the exact amount, so order a little extra.
Is the rebar estimate enough for my wall?
No. Reinforcement depends on wall height, grout, and seismic and wind zones. The estimate is for planning only, so verify reinforcement against local code and a licensed structural professional.
Why add a waste allowance?
Cuts, breakage, corners, and partial blocks all add up. A 5 to 10 percent allowance keeps you from running short mid-course.
Do I need to fill the cells with grout?
It depends on local code, the seismic zone, and the wall height. Structural walls and walls that carry vertical reinforcement usually require grouted cells where the rebar runs. Low decorative walls may not.
What is the difference between type M, S, and N mortar?
Type M is the strongest (2,500 psi) and is used below grade or in heavy structural walls. Type S (1,800 psi) suits load-bearing walls and below-grade applications. Type N (750 psi) is the most common for above-grade walls exposed to the weather.
Do I need to leave control joints?
Yes. As a rule of thumb, plan a control joint about every 25 ft of horizontal length and at each major change in height or section. Without them, the wall cracks where you do not want it to.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.