Fireblock and Drop Ceiling

leungw · 01-08-2013, 12:43 AM

Quote:

Originally Posted by 325_man

I notice you say 10". Why 10"? The xps is 2" and the 2x4 is only 3.5". So the total is 5.5".

Because the fireblock at the top needs to be touching the sill plate. The sill plates in my house are not flushed with the concrete walls. They are about 4" from the interior side of the concrete wall. The drywall at the top stick out in some areas, but it doesn't matter since the suspended ceiling is about 3" down from the joists.

325_man · 01-16-2013, 05:18 PM

Quote:

Originally Posted by leungw

Because the fireblock at the top needs to be touching the sill plate. The sill plates in my house are not flushed with the concrete walls. They are about 4" from the interior side of the concrete wall. The drywall at the top stick out in some areas, but it doesn't matter since the suspended ceiling is about 3" down from the joists.

Thanks again!
I'm doing the same as you did. I am going to seal the corner of the drywall and the sill plates with fireblock caulk and with fireblock foam for the sides where the sill plates are not flush with the concrete.

Since the xps and frames come after covering the caulk and foam seals, do you know how picky an inspector is for wanting to see that I did the fireblocking properly? I hate to tear down frame for such situation.

Nick

leungw · 01-16-2013, 09:24 PM

Quote:

Originally Posted by 325_man

Since the xps and frames come after covering the caulk and foam seals, do you know how picky an inspector is for wanting to see that I did the fireblocking properly? I hate to tear down frame for such situation.

My inspector was not too picky. He checked a couple of areas thoroughly and once he was happy with them, the rest went pretty quickly. But this of course is different depending on the individual inspector.