North Carolina Building Contractor License Practice Exam

Which of the following is not classified as a masonry mortar type?

1. Type M

2. Type S

3. Type N

4. Type C

The correct answer is: Type C

Masonry mortar types are categorized based on their compressive strength and intended use, with Type M, Type S, and Type N being the recognized classifications. Type M is known for its high strength and is suitable for structural applications, especially where compressive strength is critical. Type S, which has moderate to high strength, is often used in load-bearing walls and for applications exposed to the elements. Type N has lower strength and is commonly used for non-load-bearing walls where flexibility and workability are key. Type C does not exist in the official classifications for masonry mortar types recognized by standards such as ASTM C270. This absence indicates that Type C is not a standard mortar type, making it the correct answer regarding what is not classified as a masonry mortar type. Understanding the established classifications helps in selecting the appropriate mortar for construction projects based on required strength and application.