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Old 03-13-2009, 04:02 PM   #1
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Spanning a ceiling

Im doin a room 41'x22'6" in order to span the 22'6" Im gonna use either the pre-engineered wooden i-joists or lvl's, do they have to be on 16" centers or can I go 2' and which would be better the i-joists or lvl's? I dont need to support much weight on top 800lbs. at most


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Old 03-13-2009, 09:27 PM   #2
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Is anyone providing guidance for this project? It seems a bit, "off the cuff", if you know what I mean.


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Old 03-14-2009, 02:40 PM   #3
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The supplier will spec the centers for you depending on the type and height of the joists.
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Old 03-14-2009, 03:51 PM   #4
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Make sure you check the requirement for the flooring you are putting above the room also (if there is a room above it). Some hardwood, and possibly other flooring, manufacturers require certain spacing that may exceed the requirements fo the joist/LVL manufacturer. I've had one where the joist guy said 24" o.c. and if I remember right the hardwoods needed around 19" o.c. Check with the joist guy first and then look at the flooring to see if you need to go beyond what the joist guy says.
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Old 03-15-2009, 07:43 AM   #5
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I would go every 16" and line them up on your wall studs for support. Thats a long span with no support and I wouldnt be surprised if an engineer would spec out every 12".
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Old 03-15-2009, 07:50 AM   #6
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most are spaced no more than 16" and at that span you will be looking at 14" deep I beams. Depth of I beam and calculated dead and live loads will determine spacing.


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