Difference between type S and type N mortar mix

Dry mortar is made from the following raw materials:sand, limestone powder, cement, hydrated lime. Other materials may be added into the dry mortar mix depending on its intended application. Dry mortar can be used for a number of projects, including those using concrete blocks instead of bricks. Mortar mix is made with Portland cement, hydrated lime, and sand combined in specific proportions to meet required specifications.

1. Type S Mortar Mix

Offering a high compressive strength of over 1,800 psi and a high-tensile bond strength, type S mortar is suitable for many projects at or below grade. It performs extremely well to withstand soil pressure and wind and seismic loads. Type S is the common choice for many below-grade applications, such as masonry foundations, manholes, retaining walls, and sewers, as well as at-grade projects like brick patios and walkways. Although type S mortar must have a minimum compressive strength of 1,800 psi, it is often mixed for strengths between 2,300 and 3,000 psi.

1.1 Features of Type S Mortar Mix:

High Strength >1,800 psi

Meets property requirements of ASTM C1714 and ASTM C270

Applications from 1/4 inch to 1/2 inch

Can be mixed as a masonry mortar or stucco

Can be color pigmented with Sakrete Cement Colors

1.2 Applications of Mortar Mix Type S:

Masonry mortar for laying brick or block

Stucco scratch, brown or finish coats

Above-grade and below-grade applications

Ideal for structural brick and block projects such as foundation walls

Masonry parge or finish coating

Brick and block tuck pointing

2. Type N Mortar Mix

Type N mortar is usually recommended on exterior and above-grade walls that are exposed to severe weather and high heat. Type N mortar mix has a medium compressive strength and it is composed of 1 part Portland cement, 1 part lime, and 6 parts sand. It is considered to be a general-purpose mix, useful for above grade, exterior, and interior load-bearing installations. It is also the preferred mortar mix for soft stone masonry. Type N is the mortar most often used by homeowners and is the best choice for general application. It typically achieves 28-day strength at 750 (psi).

Features of Type N mortar:

Strength >750 psi

Meets property requirements of ASTM C1714 and ASTM C270

Applications from 1/4" (6.4 mm) to 1/2" (13 mm)

Can be color pigmented with the Sakrete Cement Colors

Application of Type N mortar:

Laying brick or block

Scratch and brown coat in stucco

Above grade applications

Interior or exterior

Brick and block tuck pointing

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