spooksmcgee
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- May 4, 2008
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I am replacing a subfloor in my house. The joists are 24" on center with a 16' span, and a little bigger than 2x8 (their dimensions are exactly 2"x8"). I'm putting in slate and a clawfoot tub, so since the joists are so far apart, I'd like to add more support. I cannot maneuver a 17' long sister in there unless I cut it in half or something. If I do that, do I have to provide support piers under the section I cut in half? I also can't use joist hangers since the joists are too thick for normal size hangers (unless I use a double hanger and fill in the sides with scrap wood?).
My only other thought is to use something like this:
http://www.hammerzone.com/archives/framecarp/supplement/floor/joist1/raising.htm
and use a 6' long 4x4 beam in 2 or 3 placed under the joists. I kind of like this option. Is this the best way to provide support? And if I do it this way, is it okay to just use 6 ton bottle jacks and leave the jacks there when done? Or should I use lally columns or more 4x4s for the support posts? And do I need to pour some kind of concrete footer for the jacks/beams, or can they just sit on the ground? What about concrete dek blocks, can I use those? Thanks for any help and any suggestions anyone might have. Below are pictures of what I'm working with:
My only other thought is to use something like this:
http://www.hammerzone.com/archives/framecarp/supplement/floor/joist1/raising.htm
and use a 6' long 4x4 beam in 2 or 3 placed under the joists. I kind of like this option. Is this the best way to provide support? And if I do it this way, is it okay to just use 6 ton bottle jacks and leave the jacks there when done? Or should I use lally columns or more 4x4s for the support posts? And do I need to pour some kind of concrete footer for the jacks/beams, or can they just sit on the ground? What about concrete dek blocks, can I use those? Thanks for any help and any suggestions anyone might have. Below are pictures of what I'm working with: