Which Mortar Should I Use | How To Choose: Type S, O, N, or M
Recipe: Type M contains 3 parts Portland cement, 1 part lime and 12 parts sand. Here are some projects that typically use type M: Foundations; Retaining walls; Driveways ; Type O. Type O mortar mix has a fairly low compressive strength, rated at only about 350 psi. It's used primarily for interior work and above grade, non load bearing walls.
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