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Old 01-06-2007, 01:49 PM   #1
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Beam Question


I wasn't sure exaclty where to post this but here goes. I am in the process of converting an attic space into a bedroom/nursery. My problem is that the floor joists (ceiling joists in the living room below) are not the proper size for a floor load. I have decided my best option is to place a beam that would break up the 20' span currently, so that I would have 2, 10' spans. I have considered using 2 LVL beams, screwed and glued together. The beam will run perpendicular across the joist and span around 15'. Am I on the right track or is using 2 lvl beams overkill? comments appreciated.

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Old 01-07-2007, 10:21 AM   #2
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Beam Question


I would say your on the right track. To me there is no such thing as overkill in most casses.

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Old 01-08-2007, 10:42 AM   #3
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Beam Question


Here is a rough layout of my living room. The double line represents the beam. I was wondering if anyone had any other suggestions besides using an lvl. The depth is almost 12 inches and would really break up my room. If that's the only thing that will work then fine, but I just wanted to double check first.
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Old 01-21-2007, 02:25 PM   #4
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Beam Question


What is the size of the attic floor joists?
2 x 6 , 2 x 8, 2 x 10, 2 x 12...
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Old 01-22-2007, 09:37 AM   #5
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The attic floor joists are TRUE 2x6's spaced 16 o.c.
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Old 01-22-2007, 10:00 AM   #6
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Beam Question


Have you conciderd useing a metal I beam. The hieght profile would not be as much as a wood product and you can just cover it up.
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Old 01-22-2007, 10:33 AM   #7
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Beam Question


Can you make the beam flush, or close to flush? If the LVL beam is the same depth as your joists you will be able to hide everything. If its a little bigger you can fir out the old ceiling and still completely conceal it.

I did the same project once. Fortunately I had a hallway beneath most of the area in question. The one area I did have long beam spans I was able to sister a second joist in place and meet the live load requirements to avoid the beam. Your tables you are likely looking at will tell you if this is possible.
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Old 01-22-2007, 01:04 PM   #8
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How do I make the beam flush?
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Old 01-22-2007, 01:12 PM   #9
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You will want to find a book that details this or google it more.

Essentially you cut your joists off so there is a gap the width of your beam. Put the beam in place then attach the joists to the side of the beam with joist hangers.

This is easier said than done but will minimize the loss of headroom. You will need access from above or below to drop or raise in the beam plus you will need to build a temporary wall on each side of the cut to support the joists.

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