Had a bit of time over the weekend to get some more thing sorted. I've removed the old shower and toilet piping, removed the toilet waste pipe to replace it with a single entry. I'll slap a coupler on here to accept the shower drain and sink drain.
I've the floor away up until the first joist. Under the floor are i-joists and they parallel to my shower tray (tiled tray) plans. I need to add perpendiculur joists to support the tray. I've done a plan up, kinda.
Here is what is underneath, this runs along the purple line. I'm thinking remove the floor entirely and obviously keep this in place. No need to change it.
This is oppose the purple joist. It is under the floor in the next room, about 25cm in. How would I secure a perpendicular joist with these style of joists?
In my head I should just run a standard 38x63mm timber along the floor as a plate, then add a chonky cut to size solid wood joist, then another top plate. However that seems like it's putting a lot of weight right on the ceiling below?....
Unless I can do this, rough drawing sorry. Dark blue acts as bottom and top plate with vertical supports to remove flex. I have time, so want to do it correctly.
Advice?