I want to make my floor level with the threshold of the sliding door. Now the joists will be 45+45 below the upper level of the baseboard/track for the sliding door. Can I place a 45x45 beam on top of the floor joists and then glue chipboard and floor gypsum to reach the height for tiles?
If so, how do I attach the 45x45 beam? Screws, nails, glue, or a combination?
Or can I lay 45x70 across the floor joists at cc 60, or will there be deflection in them?
Do you glue and screw the chipboard, or just glue? If just glue, do you screw temporarily to force the surfaces together?
Do you glue the floor gypsum to the chipboard?
