11 Best Of How To Stiffen I Joists HD Image Size. Rip a sheet of 58-inch plywood lengthwise into strips as wide as the height of the I-joists. Intervals will help stiffen the floor.
A layer of 34-in. This fix is best reserved for crawlspaces as beams limit headroom when used in places like the basement. Use Acro jacks and a plank bridging across joists to bring them dead level if they are already not.
After lining up each block with the tops of the floor joists he nails it in place.
Add nails or screws if necessary. How do you stiffen engineered floor joists. But it will help in combination with sistering or plywood facing as described below. Start by making sure the original bridging is tightly fastened.