How To Fix Broken Floor Joist. The repair typically costs 250 to 300 according to experts whove done this type of work. Repairing a floor joist Most of the time the repair is pretty straightforward.
Use the back end of a hammer or crowbar to help open the gap between the floor joist. At times when this isnt possible shorter pieces are used instead this is sometimes referred to as scabbing. SUBSCRIBE to This Old House.
Now access the area under the subfloor by going through the crawl space at the side of your house.
Remove any blocking or bridging above the sill or beam where the sister joist will go. Put on your safety gear safety goggles gloves a dust mask and a work light. Position a 2x4 post and hydraulic jack directly beneath the cracked end of the joist. Usually the new piece of lumber spans the length of the old one.
