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floor sagging need to replace joists in crawl space

floor sagging need to replace joists in crawl space

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  #1  
Old 11-04-09, 12:31 PM
C
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Question floor sagging need to replace joists in crawl space

The floor in our house is sagging & upon inspecting under house in crawl space found that some floor joists need replacing. They are on a sill & are 2x8 & 16 OC-not sure what other info may be pertinent. Want to repair without damaging existing (interior) floor. Need help to make sure I do this right. thanks for any info.
 
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Old 11-04-09, 04:42 PM
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I would try to sister new joists to the old. I wouldn't try to remove the old joists unless you need space to work. Put some new joists laying on their side, next to the old ones, then get some floor jacks & some wood to cross the joists. Jack up the floor. Flip & nail the new joists in place.
 
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Old 11-04-09, 04:47 PM
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You are talking about a major job requiring much more knowledge than the normal DIY has accumulated. You will have to jack up the side that needs replacing, but not too far(1/8-1/4" more than the joists) or you risk damaging walls, floors, etc. You probaly will need to remove several courses of exterior covering. You may be able to sister new to old, depending on what caused the problem, which should be fixed before anything else is done.
 
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Old 11-07-09, 07:43 AM
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floor sagging

Thanks for all the great info. We jacked up the beams a bit & Sistered the two beams that were sagging & in one spot put a brace underneath the beam. now the doors in the house shut without hitting the frame & the crack in the wall is not cracked (has no space in it) Thanks again.
 
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