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Unread 12-12-2020, 10:15 AM   #20
Join Date: Dec 2008
Location: sw sub chicago
Posts: 199
Originally Posted by MesaTileworks View Post
Am I understanding this right that if I can get that 2/3 of the span or put in a post and support, then the existing joists are sufficiently reinforced... *then* I could sister in new joists that only run the length of the room to be tiled to level the floor and make it a flat plane? (Basically two different solutions to the two problems?) The long joists provide the needed rigidity, and the short ones are tied into the long ones?
when in this room, can you feel the floor bouncing(to any degree) when you jump on it ? if you can, go under the floor with a 2 boards, 2x4 would be fine.

wedge them under the floor like an upside down T. put it on the center most joist in the center of the floor. now go back into the room and jump on it again and see what happens.
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