Indiana Townhomes - Fire rating requirements for exterior wall sheathing perpendicular to fire separation wall

[lteegen]

Wanting to know if 4' of fire rated sheathing is required on either side of the exterior walls that are perpendicular to the fire separation wall in a townhome where there is no fire sprinkler provided? See images below. Our townhomes consist of 1-story wood framed multi-family homes on a slab foundation that have premanufactured wood roof trusses and wall panels and are separated by a 2-hour fire separation wall, which consists of:

• 2x4 insulated stud walls with 1" air gap on either side of shaft liner panels.
• (2) layers of 1" thick DensGlass shaft liner panels that runs continuous from the top of the concrete slab foundation to the underside of fire rated roof decking.
  • The shaft liner panels are interconnected with steel H-studs and C-tracks.
  • The shaft liner panels are secured to wood framed wall with aluminum breakaway or melt clips.
• 7/16" fire rated OSB roof decking that extends 4' from either side of the fire separation wall

Plan view #1.



Plan view #2.

 

[mtlogcabin]

R302.2.3 Continuity.
The fire-resistance-rated wall or assembly separating townhouses shall be continuous from the foundation to the underside of the roof sheathing, deck or slab. The fire-resistance rating shall extend the full length of the wall or assembly, including wall extensions through and separating attached enclosed accessory structures.

We require the rated wall to extend through the exterior studs to the exterior sheathing. So, 1 & 2 would not pass in our jurisdiction.

 

[steveray]

We require the rated wall to extend through the exterior studs to the exterior sheathing. So, 1 & 2 would not pass in our jurisdiction.

Thats how I call it, but it might need some clarification...