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Old 02-11-2009, 08:02 PM   #1
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Sistering Joists to brick wall


We have a poorly crafted add-on room, which we've discovered has 2x4 roof joists supporting the roof above, and will soon hold a dry wall ceiling. Our contractor advised us that we should sister the joists with 2x6 beams to support the ceiling/roof.

When the contractor added the sister joists, he stopped shy of one of the walls (brick), rather than cutting into the brick. (He advised us prior that this was his plan). Now, that we look at the joists, we wonder if they will support properly. Can anyone provide insight as to whether the joist needs to be cut into the brick to effectively support?

Thank you.

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Old 02-12-2009, 04:44 AM   #2
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Sistering Joists to brick wall


If the only thing the joist is supporting is the drywall ceiling, I would just bolt the 2x6 to the brick. Isn't there a 2x4 next to the brick, supporting the roof sheathing?
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Old 02-12-2009, 08:46 AM   #3
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Sistering Joists to brick wall


Thanks Ron. The joist would be supporting dry wall with ceiling fan (along with roof). The brick is a former exterior wall - don't recall seeing a 2x4 next to it, but will check.
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Old 02-12-2009, 09:33 AM   #4
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Sistering Joists to brick wall


Many homes have 2X4's for joist. Are you talking about roof ceiling joist. If it is part of a truss system not to worry. The main concerns are pitch and span. You should post some pictures.
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Old 02-12-2009, 02:20 PM   #5
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Sistering Joists to brick wall


I can't picture the situation. Do you have any photos?
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Old 02-12-2009, 07:28 PM   #6
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Sistering Joists to brick wall


Thanks for your insights. Here are a couple of photos. Hopefully, I got you the right angle.

The current 2x4 joists span aprox 12' and probably run at aprox 30 degree angle. There is a roof directly above, and will have sheet rock below.
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Sistering Joists to brick wall-misc021209-127.jpg   Sistering Joists to brick wall-misc021209-128.jpg   Sistering Joists to brick wall-misc021209-130.jpg  
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Old 02-13-2009, 09:55 AM   #7
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Sistering Joists to brick wall


Looking at that, one question I would ask is: "is there sufficient connection between the original and sister joists" - when I see such repairs designed by engineers the connection is typical bolted or has three rows of staggered nails - a lot more connection than is visible to me in these pictures.
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Old 02-13-2009, 02:11 PM   #8
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Sistering Joists to brick wall


I'd put a ledger board on the brick wall supporting the ends of the new 2x6s. At the other end I wish he had the end of the new joists sitting on the new ledger board rather than notched.
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Old 02-15-2009, 07:14 PM   #9
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Sistering Joists to brick wall


Thanks everyone. We ended up having the contracter insert joist hangars on the brick wall, so I believe we're in good shape now.

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