NCMA Solutions Center: Is there a limit to size of through-penetration allowed in concrete masonry firewalls?

NCMA eNews
January 3, 2019

Yes. Through-penetration openings in firewalls are limited to 144 square inches. Additionally, penetrating items are limited to a nominal diameter of 6 inches. For more information on firewalls, see TEK 5-8B, Detailing Concrete Masonry Fire Walls.