canuck

Fireproofing sparyed foam
Hi, I was hoping someone here knew a definite answer to this question or a place I can find one.

Building:
A commercial building 1 story, flat roof, metal deck, structure is steel. The exterior is drywalled and the air/vapour barrier is applied onto the outside of the exterior drywall. The roof is a rubber membrane.

To complete the insulation a spray foam was used on the steel that supports the roof at the top of the walls. The walls are not rated wall on the inside. On the interior the drywall is 3/4" shy of the decking to allow for deflection. This leaves a 3/4" gap of exposed foam.

The foam is Polar Foam 7300

Does this foam need to be fireproofed?

Thanks for any help.

Ivinni

Assuming you are on IBC 2003 or later, the insulation guys didn't do you any favors. That is unless there is a UL fire rated system that has been published for use in structural steel fire protection.

I do not know of a foam that is used for that purpose, but I ma in the firestopping end and only cross over to fireproofing occasionally for patch work.

Are the sides of the beams and/or any other part of the structural steel fireproofed?

Do the plans call for the steel to be protected?

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its not going to get better with straps, or new footings or even aroma therapy.

canuck

As far as I know there is a req. for a flame spread <25 for any material in an air plenum. The NBC states any foam must have a flame spread rating <500.
Doesn't the Code for the air plenum trump the one for sprayed polyurethane foam?

72chevy4x4

is the foam orange? that's the fireproof rated stuff in the states. don't know the rating on it though.

threaderman

I haven't used the foam but often times am required to use a caulking ,red in color called 3600EX Firestop.

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KennMacMoragh

I used to inspect fireproofing on commercial buildings as a special inspector. And the ones I've done had a thickness specified for each member on the plans. So I had to measure and verify the thickness on each spot.

But that's how it's done on the high rise buildings in Seattle. Sorry, I have no idea what flame spread <25 or <500 means in Alberta. Ask your building department?

canuck

Thanks for the suggestions.
The inspector has not noticed and neither has the tenant contractor, so far anyways(fingers crossed.) I talked to the manufacturer but all they would do is tell me to contact the lic. tech.
Before this issue comes up again I am going to find out for sure. I believe I am right in thinking it needs to be coverd, but I have been wrong before.

Ivinni

Are you talking about firestopping the head of wall joint or fireproofing?

If it's firestop at the joint you are talking about, considering the walls are not rated, the answer to the original question is "no".

__________________
its not going to get better with straps, or new footings or even aroma therapy.