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NE78FJ40 03-07-2010 12:25 AM

Fireblock basement soffits
3 Attachment(s)
This is one of the requirements I'm dealing with.

602.8 Fireblocking required: At all interconnections between concealed vertical and horizontal spaces such as occur at soffits, drop ceilings, and cove ceilings.

The inspector said I need to fireblock my soffits. I didn't totally understand where this needed to be done. In the pictures, where and how do I need to fireblock these soffits?

NE78FJ40 03-07-2010 01:41 PM

Anyone have any ideas?

Gary in WA 03-07-2010 03:34 PM

Page #4:

16" of compressed unfaced batt insulation in all stud bays facing the ducting soffit, the height of said soffit. Key word---- INTERSECTIONS. The top plate of the wall next to the soffit stops fire but the void at soffit/wall stud bay doesn't. Where a vertical wall adjoins a horizontal enclosed space (soffit). I suggest fiber at every 10' along the soffit as well, though not required. If you get a fire in a light housing, it could travel in the floor joist bay to the soffit, to anywhere the other joists go from the soffit.

Floor/ceiling draft stopped if >1,000sq. ft. & ceiling hung from floor joists.... 502.12 concealed space under stairs and at top and bottom of stringers.... 602.8
Did you read KC's Fireblocking "how to" discussion where you also posted your question at?

Be safe, Gary

NE78FJ40 03-07-2010 06:21 PM

Yes, I've read the whole topic a couple of times.

Gary in WA 03-07-2010 06:44 PM

Imagine your drywall on the soffit bottom against the stud wall. Where it butts the wall is where the insulation or other approved fire-blocking needs to be. At the intersection of the soffit's ceiling (horizontal) and the wall's vertical joint.

Be safe, Gary

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