Properly sistering floor joists is very important and should not be rushed to save time.
Sistered sistering floor joists.
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.
This article provides step by step instructions and pictures on how to make structural repairs by sistering floor joists alongside weak joists.
Sistering joists means beefing them up with additional material.
Framing lumber is the typical.
Sistering joists for a cantilever requires removing the rim joist and sliding the new joist in beside the existing one.
If you have sagging cracked or twisted joists which can happen in older houses this project will provide the extra support the floor needs.
Doing so strengthens weak joists and can help straighten sagging joists.