| IA |
Fire resistance rated non-combustible construction. |
| IB |
Fire resistance rated non-combustible construction. |
| IIA |
One-hour fire-resistance-rated non-combustible construction. |
| IIB |
Non-rated non-combustible construction. |
| IIIA |
One-hour fire-resistance-rated combustible construction with non combustible exterior walls. |
| IIIB |
Non-rated combustible construction with non-combustible exterior walls. |
| IV |
Heavy timber construction. |
| VA |
One-hour fire-resistance-rated combustible construction. |
| VB |
Non-rated combustible construction. |