84c - Structural Masonry Codes Official

| Masonry Type | Allowable Compressive Stress (psi) | Allowable Shear Stress (psi) | Notes | |--------------|------------------------------------|-------------------------------|-------| | Type N mortar, solid units | 350 | 30 | Unreinforced, non-seismic | | Type S mortar, hollow units | 600 | 50 | Reinforced | | Type M mortar, grouted | 800–1200 | 60–80 | High-strength, seismic zones |