SFRM Fire Rating within assembly IBC 704.3

[jar546]

I have a primary structural member (header) that is required to have a 2 hour fire rating and is sprayed with an SFRM. The special inspection stated that this particular member does not have a coating on it thick enough to meet a 2 hour rating. This particular beam is located and enclosed within a 2 hour rated shaft wall. The engineers have responded that there is redundancy as the header is within the fire rated wall and therefore a moot point.

Thoughts?

Can't seem to find definitive language in 2009 IBC 704 that addresses this particular situation and I believe it is hinging on the definition of the word encapsulate. This is for a high rise hotel and the shaft referenced is the elevator shaft.

 

[steveray]

The wall would have to be rated from both sides....if it were I would be good.....

 

[jar546]

The wall would have to be rated from both sides....if it were I would be good.....

Yes, I agree. 2 hours from both sides.

 

[cda]

So what was shown on the plans as far as how the header was going to be protected

 

[Paul Sweet]

Individual encasement means the primary member must have fire protection that doesn't depend on the membrane. Secondary members can depend on the membrane for protection (704.4).

I would consider a masonry shaft as providing individual encasement, but I'm just a man with pencil who draws.

 

[jar546]

So what was shown on the plans as far as how the header was going to be protected

It was SFRM thick enough for 2 hours