Choosing between Type S and Type N mortar depends entirely on whether your project involves structural masonry load-bearing walls, above-grade bricklaying, or tuckpointing repairs. Type S mortar provides high compressive and flexural bond strength, making it ideal for below-grade applications, retaining walls, heavy-duty load-bearing brickwork, and exterior masonry exposed to severe weather. Type N mortar offers medium compressive strength and excellent workability, making it the preferred choice for standard above-grade exterior walls, interior chimneys, and general tuckpointing where flexibility and weather resistance are paramount. Neither Type S nor Type N mortar should be used as a substitute for tile thinset when setting ceramic or porcelain flooring.
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