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Old 02-25-2014, 12:47 PM   #1
Join Date: Feb 2013
Location: Illinois
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fireblocking of soffitt

I have several soffitts in my basement and don't know exactly how to fireblock these. Some are attached to a wall on one side and some are not attached to a wall and just hung from the floor joists. I am using both Roxul and 5/8 drywall strips. Since the soffit is under the floor joists that is a pretty large open area between each floor joist and was just wondering what to do.

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Old 02-26-2014, 09:30 AM   #2
Join Date: Apr 2012
Location: Durham NC
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fireblocking of soffitt

I can give you a general procedure but posting pics will help too. you want the fireblocking to look like wall top plates where the soffit lands on the wall. I like to keep my fireblocking about a 1/2" below soffit level to the bottom of the fireblocks and you will need to have the blocking tight back against the concrete wall as well along the soffit line height.

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Old 02-26-2014, 12:08 PM   #3
Join Date: Feb 2013
Location: Illinois
Posts: 80

fireblocking of soffitt

Here are some pictures and hope this can help. I don't know how the pictures will be displayed so I will try to explain. One picture is of a finished soffitt that was not fireblocked, didn't know I should do it at the time. The soffitt is attached to an outside finished wall so where that soffitt ends is at a sheetrock wall so that end is sealed. Another picture is taken in a new bathroom, since the ductwork was hung so low I first put up the 5/8 drywall on the ceiling then built the wall up to the drywall, so the top plate of that wall has the sheetrock sandwiched between, that was the only way I could do it and keep the bottom of the soffitt at seven feet. It's awful hard to get good pictures for you because I could take twice as many and still probably not have enough information. Some of the walls are finished/painted without fireblocking and I am considering removing the walls and installing the fireblocking, lot of work and extra expense but not much of a choice and I think I can bring it back to it is not even noticeable. If you need more pictures, no problem. Thanks
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