Mortar and grout serve different purposes
Mortar forms joints and bonds masonry units. Grout fills designated spaces and works with reinforcement in the specified assembly. Their proportions, performance and placement requirements are not interchangeable.
Mortar types M, S, N and O identify different specification categories. Selection depends on the application and design requirements; a higher-strength type is not automatically the right choice. Use the specified product and its current manufacturer instructions.
Read the project specification
These identifiers help you ask for the appropriate documentation. Confirm the applicable edition, scope and required test results with the project designer. Older reference lists may use retired designations, including C145, or outdated titles. A listing here does not certify a product to a standard.
| Subject | Reference identifiers to discuss |
|---|---|
| Concrete masonry units | ASTM C90; concrete building brick references include C55. |
| Aggregates | ASTM C33 and C331, as applicable to the selected product. |
| Mortar and grout | ASTM C270 and C476, respectively. |
| Clay brick | ASTM C216, C652 and C902 address different brick categories. |
Information to request
Identify the specified unit strength, density or aggregate category, dimensions and tolerances, absorption, mortar and grout requirements, reinforcement and any architectural finish requirements. Ask for current reports tied to the exact unit and assembly.
Use these resources to prepare for a project conversation. Confirm current products, dimensions and availability with Krebs; construction and performance requirements must follow the project’s applicable specifications.
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