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Old 12-26-2011, 11:17 AM   #1
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Fire-blocking and strapping


I'll be putting drywall up on a ceiling that first will have strapping installed.
The strapping is so that I can true the ceiling as the ceiling joists have sagged a bit in the 85 yrs since they were installed.
Do I need to do anything for fire-blocking since there will be an airspace (+/- 3/4") just above the drywall because of the strapping?

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Old 12-26-2011, 11:21 AM   #2
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Fire-blocking and strapping


You should have a full fire draft stop every 500 sq. ft.

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Old 12-26-2011, 12:54 PM   #3
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Fire-blocking and strapping


That would be much a much larger area than any single bedroom in my house. The strapping stops on the partition walls. The largest room is 11x17 and the room I'm doing now is 11x13. So is this a non-issue then?
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Old 12-26-2011, 11:30 PM   #4
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Fire-blocking and strapping


I would say no, you don't need anything. But if you want to try and fireproof things then by all means go ahead.
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Old 12-27-2011, 12:53 AM   #5
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Fire-blocking and strapping


Excellent question Clutch, the thing is you really don't need fire blocking here but draft-stopping might be required, although from your description it seems they are rather small areas to contend with.

From the most recent IRC (2009, 2012 is out now too I believe but I don't know if there is a difference).

Quote:
R302.12 Draftstopping. In combustible construction where there is usable space both above and below the concealed space of a floor/ceiling assembly, draftstops shall be installed so that the area of the concealed space does not exceed 1,000 square feet (92.9 m2). Draftstopping shall divide the concealed space into approximately equal areas. Where the assembly is enclosed by a floor membrane above and a ceiling membrane below, draftstopping shall be provided in floor/ceiling assemblies under the following circumstances:

1. Ceiling is suspended under the floor framing. 2. Floor framing is constructed of truss-type open-web or perforated members.
Your 3/4" strapping would probably qualify.


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