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Old 10-13-2011, 11:24 AM   #1
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attaching new floor joists


I need to attach 2x12's to the ceiling joists (floor joists in the attic) to allow for 18" of insulation to be blown in. I'm going to be putting floor boards over it all when it's done so it can still be useable space. What would be the best way to attach them? and would 24" on center be sufficient?
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Old 10-13-2011, 12:23 PM   #2
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I assume it is unfinished space now. What is there now.... 2x8's? Are you trying to go parallel or perpendicular to the current joists? what is the spacing of the current joists? I wouldn't assume that simply stacking boards will thereby increase the load capacity to make it a finished area if it wasn't designed to be.
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Old 10-13-2011, 09:40 PM   #3
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It's a previously poorly finished space. I'm tearing out all the drywall and insulation and they used decking boards for a floor. So I'm tearing those up and want to run the 2x12's perpendicular to the 2x6's that are there. they hold weight fine. There was outlets and lights up there so I'm sure the previous owner used it as a living space. They are 16'' OC.
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Old 10-13-2011, 11:28 PM   #4
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Did you entertain any other way to get the insulation value without all the added weight?
Wouldn't a closed cell foam get you where you want to go without all the framing?
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Old 10-14-2011, 02:59 PM   #5
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Man, that must be one tall attic if you can lose 12" of ceiling height and still make it livable space! (or, perhaps, you are one of the 'little people' from the Emerald Isle)
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Old 10-14-2011, 10:11 PM   #6
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I would run the proper sized joists parallel with the existing joists, on top of (since they are resting on bearing walls below), after adding a bearing plate and rim which also keeps the existing joists from rotating in place. Run perpendicular, the existing ceiling joists would take the full dead load for which they were not intended/possibly rated.

What will be the end use of the floor? Living space, storage, etc.?

Gary
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Old 10-14-2011, 11:59 PM   #7
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the current ceiling in the attic is 7'. The area I want to insulate will be used only for storage (decorations, camping gear, ect...) I'll look into closed cell foam. Thanks.
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Old 10-15-2011, 02:51 PM   #8
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For others interested in attic storage and Code: http://docs.google.com/viewer?a=v&q=...1txlzU01V4JQIg

Gary
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Old 10-17-2011, 10:50 PM   #9
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how tricky is it to put floating wood floors on to top of existing floorboards? The ones in our main room, kitchen and dining room are in a shocking state and different colours, and the same as yours have been described - a bit sloping, dippy and bouncy. I was even tossing up putting carpet down, but i love the wooden floor board look. I am just not sure whether to address the boards as they are or cover them... I can't do anything until after our house gets lifted and restumped (which hopefully will be soon!).

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