Floor Joist Crown

The joists that is cut will stay crowned unless acted upon by an outside force though it may drop a teensy bit.

Floor joist crown.

You need to make sure the hump in each floor joist is pointing to the sky. I have full access under the joist a 2x12 with a full basement. It appears the previous tiler tried to deal with the crown by putting a grout line directly on joist and tilting the tile slightly but it is still quite noticeable. Take a look in the crawl space to see if anything is forcing the joist up beam stub wall.

If the crown is less than about 3 8 you can just sand it down with a belt sander. They sure don t build them like they used to. One of the joists close to the end joist of the house had a very significant crown in it. Joists that have severe crowns need to be set aside or some of the crown needs to be trimmed off so the floor remains fairly flat once covered with plywood or oriented strand board.

If it s really bad you might have to pull the sub floor and plain down the joist but that s not much fun. Then use screws to draw down the crown then set the splicing joist in tight. Actually the 2x4s could be added after the notch is made and the glue and 8 ft. Long joist is applied.

The joist on the other side of the crowned joist was properly level meaning it was in plane with the end joist. I am retiling bathroom floor and have a very noticable crown on one joist the other joists all appear level.