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    How to Choose the Right Mortar Mix Type: N, O, S, or M - The …

    • Type S mortar mix offers high compressive strength of over 1,800 psi and high-tensile bond strength. This makes type S mortar mix suitable for many projects at or below grade. Type S mortar mix is a load-bear… See more

    Type N Mortar Mix

    Type N mortar is a general-purpose mix usually recommended for exterior and above-grade walls (including stone veneer) exposed to severe weather and high heat. Type N mo… See more

    The Spruce
    Type O Mortar Mix

    Type O mortar mix has relatively low compressive strength, at about 350 psi. As such, it is used primarily for interior, above-grade, non-load–bearing walls. Type O mortar mix … See more

    The Spruce
    Type M Mortar Mix

    Type M mortar mix has the highest amount of Portland cement and is recommended for heavy loads and below-grade applications, including foundations, retaining walls, and driveways. … See more

    The Spruce
    What is mortar mix proportioning?
    Mortar mix proportioning is typically conducted by volume rather than weight, making it simpler and more practical for construction sites. The ASTM C270 standard outlines the recommended mix proportions for different types of mortar. The table below provides a quick reference for the ratios of Portland cement, lime, and sand:
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