- Fireblocking is required in any concealed wall spaces, including furring, parallel rows of studs, including vertically at the ceiling and floor levels, and horizontally at all intervals not exceeding 10’-0”.
- At all connections between concealed horizontal and vertical spaces, such as floor joists or trusses, soffits, cove ceilings, and similar locations
The installation of fireblocking in these areas limits flame and smoke propagation through walls and spaces such as between studs or where the floor or ceiling meets the walls.
- Between the stair stringers at the top and bottom of each run
This limits the chance of a fire or smoke propagating through the stairs and moving from floor to floor through the concealed spaces below the steps.
- All ceiling and floor openings around vents, pipes, ducts chimneys, and fireplaces - note that at this location materials are specifically permitted to be “materials tested in form and manner intended for use to demonstrate its ability to remain in place and resist the free passage of flame and the products of combustion”. At these locations it is not required to be the materials noted below
This requirement is commonly seen in high-rise buildings, as there are almost always pipes and ducts passing through the floors, and fireblocking is required around the openings. It is important to note on the drawings the product being used to confirm that a UL-listed or tested fireblocking material is proposed, as that is something that is commonly missed on drawings.
- Within concealed spaces of combustible exterior wall coverings into areas not exceeding 100 sq. ft, 20’-0” max in either direction with some exceptions
Similar to above, this is to help with limiting flame and smoke propagation through the concealed spaces in exterior walls.