Sistering Ceiling Joists
Framing lumber is the typical choice for sistering.
Sistering ceiling joists. Screw the metal joist to the existing wood ceiling joist and to each plate and you have very effectively reduced the load deflection of any stored attic loads for little cost. The joists rest on a 2x4 exterior wall on one end and on a 2x4 interior wall shared with the house on the other end. Then set new joists same height as existing ones alongside the old. Be prepared to get a little dirty but rest in the fact that fixing this problem properly will help avoid major headaches later.
It has been suggested that we reinforce these by sistering them with new lumber using a strong adhesive and boltsnails. Since this is a repair of a faulty or damaged floor joist it is imperative to do this project correctly and there are a few big mistakes to avoid. A day until theyre level. There is no other support to the joists.
Jacking them up too fast may cause cracks in the walls and floors overhead. Tack a beam under the sagging joists. I forgot to mention the construction adhesive in between them. I have seen questions about sistering joists here before but would like to ask more specific questions to clarify the best methodology.
The sistering that i have done has been in locations where i have needed as much strength as possible in a small depth for example adding to existing 2x6 ceiling joists or 2x8 floor joists. Sistering joists means beefing them up with additional material. Steel is so much easier to work with and weighs practically nothing and is straight. The roof stucture is comprised of rafters no trusses and there is no beam supporting the center of the joists.
Our 60 year old floor joists are showing their age. Sistering roof rafters building construction diy chatroom home credit to. Doing so strengthens weak joists and can help straighten sagging joists. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.
Sistering a new joist function a few of my joists have some minor termite damage that i plan to repair with bondo but this one has some heavy damage on the bottom 4 inches for about three or four feet bad enough that i could probably just rip the bad parts out by hand. Set a hydraulic jack and post under the beam and jack up the joists about 18 in. I have done this many times in rooms and older garages with sagging ceiling joists. The ceiling joists are 2x6 with a 10 span.
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