Hello, I'm new to the forum and have a question regarding door transitions. I am currently working on the living room floor of my 100+ year old home in Tx. I've leveled the foundation (pier and beam) and replaced the floor joists due to crowning. I salvaged the original floors which are 3/4" 14' Long leaf Pine. The home has no subfloor and the joists are 24"OC (bridged) the issue I'm having is how to address installation of 23/32 subfloor and mitigate the height difference between rooms. I want to install subfloor to eliminate bounciness, I would appreciate any advice or recommendations.

I handled the small (1/4") floor height differences between rooms by using a combination reducer/transition molding. I made them myself from a piece of the flooring. It has the profile of a piece of T molding but the edge that rests on the lower floor is thicker by the height difference between the 2 floors. You don't mention the actual height difference but if it is significant then you could use a reducer that ramps you down from the higher to the lower floor. I've reread your post....if the height difference is 23/32" remove 1/32" from a piece of flooring so it is level with the flooring plus subfloor and put a chamfer (15 degrees) on the edge that ramps you to the lower floor. You want the chamfered edge a maximum of 3/8" to 1/2" thick....I made mine a little less.