Masonry and concrete walls are rated as what type of firewalls?

Masonry and concrete walls are classified as type 4 firewalls. This classification is based on the materials and their fire-resistance properties. Type 4 construction typically involves the use of heavy timber, masonry, or concrete, which are materials that can withstand fire for extended periods.

Masonry and concrete walls offer enhanced fire resistance due to their dense composition, which limits the rate of heat transfer and slows the spread of fire. This durable construction type is also effective in providing compartmentalization within a building, which can help contain fires and protect means of egress for occupants.

The other classifications, which may include lighter frame constructions or materials with lower fire resistance ratings, do not possess the same degree of fire-resistance capabilities as type 4, highlighting the importance of material selection in fire prevention and safety strategies.