Once complete I checked the subfloor above for any penetrating nails that would inhibit the new joist. These items would all need to be replaced after sistering the joist. I also had to pull wire staples and unscrew conduit and heating pipe supports. This necessitated shutting off the electricity and disconnecting a smoke alarm and some thermostat wiring. The first step was to temporarily remove or relocate the electrical cables and pipes. I also found old nails and pipe brackets, left in place from years past-I hate that. I had a few obstructions in my way there were electrical wires, thermostat cables, a refrigerator water line, electrical conduit and heating pipes in the area. After cutting to length, I then ripped the new joist to fit. I used a circ saw to cut the new joist so it would sit 3 inches on top of the beam. The length of the new joist was cut so the end fit 3″ over the support beam. Follow IRC and your local building code guidelines for notching framing material before doing this repair. When installing a new joist on a foundation wall you may need to notch the bottom edge so it can fit. (Note: A nominal 2×8 board measures 1-1/2 by 7-1/2 inches.) Cutting the New Joist The space between the beam and the floor boards above was 7 inches so I decided to use regular framing lumber and rip a 1/2-inch off the width of a 2×8 framing member. I would sister the two together with structural screws. My approach was to install a new joist next to it, resting one end 3 inches onto the mid-span beam and installing a joist hanger on the other side. “Sistering” the joists means to fasten the joists together through the face to double the thickness of the framing. The damaged joist measured exactly 2 inches by 6-1/4 inches deep-a true 2×6. This floor system was built in 1863 and was later reinforced with a mid-span beam approximately 7 feet away. This is referred to as “sistering.” The plan was to sister a new joist next to the old one. Sister JoistĬorrecting a problem joist is an easy repair and is usually accomplished by fastening a new joist next to a damaged floor joist, doubling the thickness of the framing member. ![]() Remove any leftover fasteners or hardware.
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