Fire Resistive Construction

Walls:

• solid masonry, including reinforced concrete not less than four inches thick
• hollow masonry not less than 12 inches thick
• hollow masonry less than 12 inches thick, but not less than eight inches thick with a listed fire-resistance rating of not less than two hours
• assemblies with not less than a two-hour fire-resistance rating

The exterior bearing walls and load-bearing portions of exterior walls must be of noncombustible materials or of masonry, but exterior nonbearing walls and wall panels may be slow burning, combustible, or with no fire-resistance rating.

Solid masonry example

Hollow masonry example

Exterior walls of noncombustible materials

» Definition