Replacing Floor Joists From Below

The notch was made where the floor joist recessed into a wood beam supported by chimney corbeling.

Replacing floor joists from below. That s a different story. From initial inspection it appeared that someone had notched the joist too much and then installed a makeshift patch. Replacing the floor under the bathtub toilet and the sink. Lower the piece of subfloor you.

But replacing a joist in a house that already stands. First you re working from below. Continue reading below our video of the day get out your crowbar and your hammer. Thre ways to fix a sagging or sloping floor.

Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. The foundation is open and the joists just drop in from above. Working in the unfinished basement below the bouncy floor we had to remove the plumbing and electrical lines running through the joists and then rerun the lines. Depending upon the conditions it is possible to strengthen or repair existing framing members such as floor joists or roof rafters by adding reinforcing material sandwiching the member on either side with plywood is sometimes worthwhile but the plywood must be installed correctly for greatest strength.

This will create a weak spot. Years ago while working as a carpenter i helped stiffen a bouncy floor by nailing a new 2 10 to each of the 2 10 joists that supported the floor. This joist was installed in 1863 and was located directly below where a heavy refrigerator now lives. But if there s limited access to the joists it may be necessary to work from above removing the flooring and subflooring to repair or replace any damaged floor joists.

Pry the floor joist from the subfloor with the back of your hammer. To replace floor joists you must first remove the floorboards that cover them. Installing a floor joist is a relatively easy task in new construction. Typically floor joists are repaired or replaced working from below in a basement or crawl space.

Using some construction adhesive like loctite pl premium available on amazon in a caulking gun run a small bead of adhesive along the top of the floor joists. Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor.