03:56PM | 03/15/03
Member Since: 11/26/02
9 lifetime posts
I have an old house built in 1905 and I would like to sister the attic floor joist. Since the joist are old construction the joist are actualy 2x6. My question is should I sister them with todays 2x8 or should I use 2x6? I read somewhere that said in order to sister a joist correctly you must use the same size joist or larger.



03:48PM | 03/16/03
What is the reason behind wanting to sister the joists?



02:46AM | 03/17/03
Member Since: 11/26/02
9 lifetime posts
Well the floor seems to be able to hold plenty of weight. But I would like to firm it up a bit to make sure there is no bounce since I will be putting a treadmill up there.
The joist span is about 12.5' and they are spaced about 14.5" apart. I will be putting in blocking as well but felt sistering would be a good idea since I have the floor open.


06:08AM | 03/17/03
You might want to consider using 2x8s to sister against your 2x6s. The 2x6s @ 16" centers are span rated for 10'-9" max. Even @ 12" centers a 2x6 joist is only rated for 11'-10". These span ratings are for attics and/or bedrooms, not an active room as you will be using it for.

For an active room with a tread mill the maximum span for a 2x6 joist @ 12" centers is 10'-9". 2x8s will meet your needs much better and will help eliminate the bounce much better.


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