ICC Structural Masonry Exam 2025 – 400 Free Practice Questions to Pass the Exam

For adhered masonry veneer installations, Type S mortar is typically specified due to its balanced properties that offer good compressive strength and bond strength, making it suitable for applications where the veneer needs to adhere securely to the substrate. This type of mortar contains a higher cement content and is mixed with hydrated lime, providing a strong, workable mixture that can withstand various stresses, including wind loads and thermal expansion.

Type S mortar has a compressive strength of at least 1,800 psi and is recommended for use in below-grade foundation walls, reinforced masonry, and areas where the masonry is exposed to high moisture or other environmental stresses. Its formulation allows for adequate flexibility and resistance to cracking, which is crucial for thin veneers that may experience movement.

While other types of mortar, such as Type M, Type N, and Type O, have their specific applications, they do not provide the same combination of strength and flexibility required for adhered masonry veneer installations as effectively as Type S mortar does.