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Old 02-18-2012, 01:25 AM  
BridgeMan
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Don't forget to throw in an "inverted reduction factor" if the joists are continuous over the interior load-bearing walls, vs. just simple span. Not likely they are, but one never knows until looking. There were a lot of old growth, large trees being harvested when the place was built.

A rough rule of thumb is the inverse of 80% (0.8), or 1.25.



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Old 02-27-2012, 04:17 PM  
kalawn
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My experience with older homes like yours is that they used 2x6 ceiling house up to 18 +feet. I have done a couple things to stiffen the floor up to usable living space loads. 1-- Build a knee wall nailing the studs to the side of the rafters down to the side of the ceiling joist. 2--widen the ceiling hoist by laying another member on top of the existing hoist and gusset together with plywood. Example, stand on edge a 2x6 on top of the existing 2x6. Rip plywood strips 10 3/4" apply glue to the sides of the 2x6s and heavily nail the plywood to both 2x6s. It will pass code.



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Old 02-27-2012, 05:24 PM  
nealtw
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kalawn; When you have doubled the 2x6 like this do you stop at the knee wall or do you go full length.
BTW. welcome

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Old 02-28-2012, 05:32 PM  
kalawn
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You go the full length so you have bearing on the walls. The knee wall is not required if you do the hoist this way.

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Old 03-03-2012, 02:35 PM  
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You may have to completely rebuild the stairway though....
Adding 2x4's to the bottom of joist- similar to an "I" beam, steel strapping wrapped around the joist, simply doubling (sistering) the joist, plywood “T” floor stiffening, LVL’s sistered, depending on purpose and application involved. http://www.finehomebuilding.com/PDF/Free/021184090.pdf
http://boards.hgtvremodels.com/eve/forums/a/tpc/f/4891014781/m/9591011862


Be sure to glue the groove of the T&G for maximum strength and correct application as per manufacturer of the sub-flooring.

Gary

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Old 03-03-2012, 10:28 PM  
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Wow, lots of great info, it takes a while for a newbie like me to absorb it all and fully understand it.

Thanks Kalawn for jumping in with great info on your first posts!

This is what I like about this forum, not only are there a number of experienced people with knowledgeable answers, but others chime in with more than one correct way to approach the issue.

vince



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