Replacing Floor Joists From Below

Typically floor joists are repaired or replaced working from below in a basement or crawl space.

Replacing floor joists from below.

Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. 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. The foundation is open and the joists just drop in from above. That s a different story.

First you re working from below. To replace floor joists you must first remove the floorboards that cover them. Put the tip of the crowbar between the boards and push it in using the hammer to tap on the end. From initial inspection it appeared that someone had notched the joist too much and then installed a makeshift patch.

It was a complex expensive job. Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor. 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.

Pry the floor joist from the subfloor with the back of your hammer. But replacing a joist in a house that already stands. Continue reading below our video of the day get out your crowbar and your hammer. Installing a floor joist is a relatively easy task in new construction.

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. 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. The notch was made where the floor joist recessed into a wood beam supported by chimney corbeling. Thre ways to fix a sagging or sloping floor.

Subfloor is glued and screwed on top for a squeak free floor. Lower the piece of subfloor you.