Started work on the bathroom. First step, is the sub-floor suitable. For context this used to be a bedroom, which we've split in two and are now making a bathroom where there wasn't one previously.
I'm getting an engineer to come round on Monday to do the maths, but thought I'd ask here as well because I know there's some mech/structural engineers on here. The clear span is 3.71m, they are 'true' (1950s built) 2"x7" i.e. 51mm x 178mm. The bath will go across the width of the back. So the weight of the bath will span 5 joists.
I've exposed 2, the plan is to sort that side, then I'll clear the other side, doing it in halves always gives me a platform to work on.
I'm hoping either a) they don't need strengthening or b) I can strengthen them with ply sistering.
Also I was hoping to do something like this with the subfloor:
By having the plywood subfloor level with the top of the joists, it means I only have to add tile backer boards + tiles on top of the height of the joists. Which means the height difference into the hallway shouldn't be so bad. In the hallway it's 18mm floorboards on top of the joists, then 6mm ply, then ~3mm lvt.
Using the flexible adhesive to level the tile backer boards + electric ufh + tiles + tile adhesive I'm hoping they come out at similar heights.