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Old 04-24-2010, 12:55 PM   #1
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another old house

ok so I remodeled my house moving the kitchen to another location, with new 3/4" subfloor, and 12' span 2x6 joists I have a bouncing kitchen, can I run 3 laminated 2x6's perpidicular supporting like a beam under the middle of the floor joists? It's a 18" dirt crawl space, not a hell of a lot of room.
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Old 04-25-2010, 08:45 AM   #2
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You would need intermediate support under the triple 2x6's. I would install piers every 6'.
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Old 04-25-2010, 09:05 AM   #3
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I was not clear what the dimensions of the floor were, you said the span was 12 feet, but what width of floor would the beam pick up? If the floor is 12x12 feet, the beam would pick up 6 feet of width, and at 40 pounds per square foot would be overloaded. As previously noted, you could put a pier in the middle, shortening the span to 6 feet, and be OK.
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Old 04-25-2010, 09:46 AM   #4
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part of the problem with going to a larger beam is you lose mandatory clearance to ground. if you can make 2x6 beam with intermediate posts work i would go that way. imo
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Old 04-25-2010, 10:28 AM   #5
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Floor Joists, Girders And Posts
Wood joists, or the bottom of wood floors closer than 18 inches, or wood girders closer than 12 inches to the ground in the under floor areas, must be redwood or pressure treated lumber. Girders entering masonry or concrete walls must have a minimum bearing of 3 inches and have a minimum of 1/2 inch air space on top, sides and ends unless they are of redwood or pressure treated lumber. Posts supporting girders must fully bear on redwood plates set in or on the pier block. The bottom of posts must be a minimum of 6 inches above grade.
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