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Old 10-09-2012, 03:19 PM   #1
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Adding an upstair in the attic


The picture i am showing is the area where my living room is at, which has a higher ceiling than the rest of the house. The rest of the upstairs is easier to do but the area above this section of the house has got me at odds. It has 2x8's ceiling joist (red) spanning 19.75' with a beam laying flat and a beam on its side (blue and purple). This beam on top of the joist connects the trusses of the roof as well. Each joist is 16 OC except for one. Im hoping the picture does more justice to what i am working with. Now the question is if i want to put an upper floor with a heavy load what would be the best way to make this work.

In all i think this was bad engineering on the builder and maybe not up to code from the span tables i have looked at.

My thoughts were to sister in 2x10 or 2x12 beside the 2x8 put back the beam that held on the trusses like the original and then actually put a 4x12 beam on top of the joist in about 12' marker where my wall is going to be and tie the joist in with that beam. This beam will connect to the wall on both sides that leads to the foundation. Also i might add blocking which helps from twisting. Ideas please?
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Old 10-09-2012, 03:52 PM   #2
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Adding an upstair in the attic


some photos would probably aid everyone ..... I'm some what confused by your descriptions

what are the dimension of "the beams?" Typically beams are not laid flat (I think this may be lateral bracing) as they do not achieve as much strength against bending in this configuration.
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Old 10-09-2012, 04:14 PM   #3
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Adding an upstair in the attic


The flat beam is a lateral bracing and its 2x10. There is an actual 2x12 next to it which is nailed to the 2x10 and the roof bracing. More or less in the diagram the blue and purple rectangles. I will get an actual picture when i get the chance.
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