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Old 06-17-2013, 10:27 PM   #1
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Floor joist hanging question


Hi all,

I have an interesting situation where I'm trying to build/extend a floor in order to make one floor level with another. There is about a 20" height difference currently. This is in an attic. So the new floor joists will attach on one side on a gigantic glulam beam. The other end of the floor joists will rest on top of knee walls built on top of load bearing/exterior walls. The knee walls will only be about 12" tall.

My question is can my joists just rest on the knee wall, and be nailed in and blocked appropriately, or do I still need to have a header board on the end of the joists (along with blocking, etc)

I drew a picture:
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Old 06-17-2013, 10:32 PM   #2
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Floor joist hanging question


Post a picture of what you really have not just drawing.

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Old 06-18-2013, 06:19 AM   #3
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Floor joist hanging question


A header will be an easier and cleaner installation and doesn't take any more material.
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Old 06-18-2013, 08:02 AM   #4
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A header will be an easier and cleaner installation and doesn't take any more material.
Plus you still have 2" bearing, and a lot more fastening with the rimboard/header.
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Old 06-18-2013, 08:21 AM   #5
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Floor joist hanging question


Either one would be functionally OK. Most carpenters, given the choice, would do the rim joist - it's easier to end nail a bunch of joists than to put in the blocking. Don't forget to sheath or otherwise brace that little knee wall.
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Old 06-18-2013, 09:31 AM   #6
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Why dont you get full bearing, and block between the joists? I am somewhat concerned about having a short wall attached to the top of a bearing wall without knowing what kind of lateral forces are on that wall. Can you elaborate?
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Old 06-18-2013, 10:05 AM   #7
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Why dont you get full bearing, and block between the joists? I am somewhat concerned about having a short wall attached to the top of a bearing wall without knowing what kind of lateral forces are on that wall. Can you elaborate?
Well, it's a good question, and having answered the question about how to put joists over to that edge - what are you planning to do up in that attic? I supposed that you were putting some storage up there, for bicycles, holiday decorations, etc. If you're planning to add an additional floor of habitable space, you need to get some engineering done and get some real plans, permits, etc.
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Old 06-18-2013, 11:20 AM   #8
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Well, it's a good question, and having answered the question about how to put joists over to that edge - what are you planning to do up in that attic? I supposed that you were putting some storage up there, for bicycles, holiday decorations, etc. If you're planning to add an additional floor of habitable space, you need to get some engineering done and get some real plans, permits, etc.
Very good points. That glulam might have been designed to handle a 20 psf storage load in the attic, which is usual, and not designed for a 40 psf load which is usual for a continually occupied floor. It may be adequate, but you need a structural engineer to tell you it is.

Also how about telling us what that beam is supporting now, instead of just showing a beam in mid-air.

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Last edited by jagans; 06-18-2013 at 11:23 AM.
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