Choosing the Right Mortar Type

There’s a lot to analyze before choosing the correct mortar mix. You can start by thinking of three crucial characteristics of the mortar: compressive strength, flexibility, and bonding properties. Each variation of mortar mix comes with its own measurement of Portland cement, sand proportions, and hydrated lime. So which mortar type is correct for your project? Let the Orlando masonry experts at Bedrock help you choose the mortar type that best fits your needs.

Mortar Type N

This mix is typically recommended for above-grade walls that are frequently exposed to a more heated climate. Known as a general purpose mortar mix, and composed of one part Portland cement, six parts sand, and one part lime, this is a medium-compressive mix. The type N mix is usually the ideal soft stone masonry mix achieving 28-day strength and reaching about 750 psi. This means that in a test after 28 days, the mortar was still strong after being compressed by 750 pounds per square inch. Keep in mind that this mix is used most often by homeowners.  

Mortar Type O

The type O mix is listed as an alternative to the more commonly used type N mix. With a lower compressive strength coming to roughly 350 psi, this mix is optimal for interior use and is typically used in above-grade situations. The type O mix is ideal for an interior project due to its limitations of structural capacity, meaning it isn’t meant to withstand frequent high winds.

Mortar Type S

The type S mix offers high compressive strength with a high tensile bond strength over 1800 psi. This mix is ideal for masonry use below grade. With optimal performance against soil pressure, seismic conditions, and winds, this mix is ideal for foundations, manholes, pavements, and patios. The type S mortar is required to withstand at least 1800 psi with their average mixes ranging from 2300 psi to 3000 psi.

Mortar Type M

Being known for its concentrated Portland cement (three parts portland cement, 12 parts sand, and one part lime), the type M mortar mix is optimal for masonry below grades, such as foundations or driveways. As a durable mix with the strength of at least 2500 psi, this mix is usually in contact with the earth and has uses in sidewalks or retaining walls.  

 
Before using one of these mixes, do research to determine if they are the correct mix for your project. Also, it may be best to contact an Orlando masonry expert at Bedrock to assist you in the choice and implementation of your mix. Contact us by calling 407-499-8024 or by filling out our online contact form.