Mortar Type | Minimum Compressive Strength | Cement:Sand:Hydrated Lime Ratio | Uses |
---|---|---|---|
Type M | 2,500 psi | 3:12:1 | Underground, foundations, retaining walls, driveways |
Type S | 1,800 psi | 2:9:1 | Underground, foundations, retaining walls, manholes, sewer walls, brick patios, pavements, and walkways |
Type N | 750 psi | 1:6:1 | Above ground, general purpose, interior, exterior, mild load-bearing, chimneys, soft-stone or low-fired brick masonry |
Type O | 350 psi | 1:9:2 | Above ground, non-load-bearing, interior |