How to increase floor level

Hi guys,

So just put the new joists up in the bathroom as we are redoing it, and we’ve checked that we’ll need about 12cm to be up to the floor in the hallway.

now, with thick plywood, floor adhesive, abacus elements boards, shower tray, tile adhesive, and tiles, that’s only gonna bring us up to about 7cm tops.

how can we bring this up a bit?

can we add more ply?

 

Is it really bad to do that? How many stacks of ply can you realistically and structurally put on the floor without compromising any floor integrity or it being too heavy for the joists. They are 2 by 6s only going 1.47m long with a span of about 42cm

 

we couldn't as we wanted to drill in the middle of the brick rather than through the mortar for the anchors, we had two choices either go low or higher than the original floor

 

long story short, we had to replace the old floor as it was rotten and was done badly and we could not go with the old design so we decided to go with two two bearers and and 6 joists in between, problem is we could not drill the anchors any higher as they would have gone through the mortar between the bricks and if we went even higher we would have ended up above the previous floor so we took the risk of going lower rather than higher

 

the used 2x4s but slotted them to the wall, to do that they had to cut them and make them smaller... we couldn't go with that design so instead we went with the option mentioned above in my reply to DiyDave

 

Correction. It’s 95mm instead of 120mm. If that helps....

 

Sadly it’s a bit late for that....

https://ibb.co/CbtVPrk

time has kinda run out.

I had an idea but don’t know if that’s appropriate.

it’ll get the level up properly.

1. put 18mm ply
2. Adhesive (bout 3mm)
3. Q-board (like an abacus backboard) 50mm
4. Adhesive (about 3/4mm)
5. Put 18mm ply
6. Tile adhesive (3mm?)
7. Tiles 10mm

brings us to about 105mm

question is, is it ok to do this? Yes it’s faff and grief but no choice now...

the shower tray is an impey that is 22mm, so thought of having that sit on the cement board (I.e the Q board) then using the plywood to get the floor flush with the shower tray. Then tank.

is this ok?

 

I meant 9.5cm gap. It was a mistake on our part but we were overthinking everything to the point of causing this issue. Does the suggestion I proposed above sound at all possible?

 

True... we do have a bunch of 2x4s sitting here... either that or we replace the 2x6 horizontal ones with 2x8s (assuming a 2x6 ledger is allowed with 2x8 horizontals).

Could you draw out what you mean Jord? Just something crappy in paint so I can picture what you're saying a bit better as maybe we can save our butts and go down that route... appreciate it

 

Side note, if the 2x4s are laying with the 4 inch side vertically, it would come too high, so also, do you mean the 4 laying flat and the 2 facing vertically?

 

Ok so you can’t lay the 2x4s flat. Not sure where they do 2x3s but will have a look