I need to replace three 2 x 8 floor joists in my 1916 bungalow. They have been notched, cut and shaved down to less than 2 x 4 and are worthless. I plan on removing them and adding new 2 x 10’s planed down to match the existing size. Once completed, I’ll be adding a small i-beam on posts to take up some of the bounce in the floor.
My question is how best to attach the new floor joists to the subfloor above? The subfloor looks like 1x run at an angle to the joists with oak T&G on top. Can I glue them to the subfloor from below? I came apply continual pressure with a number of jacks and temporary posts that I have, until the glue sets up.
Also, what should I use to shim the joists up tight on the ends? They sit atop CMUs. Someone suggested metal shims, but I am unfamiliar with these.