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Richmortar Masonry Cement

Richmortar Mortar Cements

Types N and S Grey and Custom Colored
Xenia, Ohio

Product Description

Richmortar Mortar Cements are produced to meet the criteria of ASTM C1329 “Standard Specification for Mortar Cements” for Types N, S, and M. (Table 1)

Richmortar Mortar Cements consist of a mixture of Portland cement, limestone, and chemical admixtures to provide plasticizing properties and other enhanced performance attributes. These components are proportioned at the cement plant under controlled conditions to assure product consistency.

Basic Use: Richmortar Mortar Cements when mixed with the recommended volumes of sand (ASTM C-144) will produce a Type N, S, and M mortar that will comply with the requirements of ASTM C-270 for both the Proportion Specification (Table 2) and Property Specification. (Table 3)

Richmortar Mortar Cements are appropriate for use in structural applications that require masonry with high flexural bond strength, and are approved for use in all Seismic Zones and Design Categories D, E, and F.

Availability: Richmortar Mortar Cements are available in one cubic foot sacks containing a plastic moisture barrier and in bulk via pressurized bulk containers.


Mixing: Machine mixing should be used whenever possible. First, add most of the water and half of the sand. Next, add the mortar cement and the rest of the sand. After one minute of continuous mixing, slowly add the rest of the water. Mixing should continue for at least three minutes; extending mixing up to five minutes improves mortar qualities.

No admixtures should be used without written approval of the architect or engineer of record. Richmortar Mortar Cements have an additive containing a water-repellent component which is interground with the cement during manufacture. No other additives are necessary, unless specified.

Water: All water should be clean and free from organic material and deleterious amounts of dissolved acids, alkalis and salts.

Retempering: To minimize retempering, mortar should not be mixed more than 15 minutes prior to use. Retempering will not adversely affect mortar quality if only evaporated water is replaced. Colored mortar should not be retempered.

Tooling of Joints: Tooling of mortar joints increases the density, durability and water tightness of the mortar surface. The moisture content of the mortar when tooled will affect the color; the drier the mortar, the darker its final color.

Specifications More

Table 1. ASTM C1329 Mortar Cement

Physical Requirements of Masonry Cements
Mortar Cement Type Compressive Strength Min. psi Bond Strength Min. psi Water Retention Min. % Air Content Max. %
N 900 70 70 17
S 2100 100 70 15
M 2900 150 70 15

Table 2. Proportion Specification (Parts by Volume)

Mortar Type Masonry Cement Type N Masonry Cement Type S Masonry Cement Type M Masonry Sand
N 1 - - 2 ¼ - 3
S - 1 - 2 ¼ - 3
M - - 1 2 ¼ - 3

Table 3. Property Specification

Under the Property Specification, the cement-to-sand proportions are to be in the range of 1:2 ¼ to 1:3 ½, and should meet the requirements outlined in Table 3.

Mortar Type Compressive Strength Min., psi Water Retention Minimum % Air Content Maximum %
N 750 75 14
S 1800 75 12
M 2500 75 12

No changes should be made in the field to the laboratory established proportions for mortar that has been tested and accepted under the property specification, except for the quantity of mixing water.

Materials with different physical characteristics than those used in the laboratory should also not be used in the field without testing for compliance with the property specifications.

Mortar Coverage Estimation More

Mortar Coverage Estimation Sheet

Type S
Unit Pieces per One Bag of Masonry
8x8x16 CMU 33 - 35
12x8x16 CMU 25 - 28

Type N
Unit Pieces per One Bag of Masonry
Modular Brick 125 - 133
Queen Brick 85 - 90
Utility Brick 77 - 81

*All estimates are approximate.

Building Materials Calculator More
Bags needed for brick count
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6" 8" 12"
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