Uneven joists - whats the plan

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Morning peeps.

I am looking for some advice please.

I am about to take on the en-suite now that i have all the other works complete and my first hurdle is to get my floor flat!

I am having a wetroom with an Impey Aqua dec, underfloor heating and tiles so i need my floor bob on.

The room isn't huge at 1830x2200 and across the joists im out 9-11MM towards the external wall (so my floor runs downhill away from the shower.

I am looking for the best practice on sorting this out...
1) Plane the high spots out - i suspect a nightmare as cant get plane close to the walls and no doubt damage my blades.

2) Rip shims to bring up the low spots.

3) Drill and Screw OR coach bolt some timber lengths to the existing joists to bring up the low spots, i suspect this to be the fastest and easiest option but given im tiling will it be good enough?

Many thanks in advance.

Peace out homies.
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What I did was to screw chunky battens to the sides of joists to bring them up and give a line to work from, then a few packers on the joists themselves, up to the height of those battens, to share taking taking the weight. (ie; option 3 with added packers). Having those timbers on the side makes it much easier to get the packers the right height.
I also didn't keep the floor flat outside the shower tray - I gave it a small (2 in a hundred or so, if I remember rightly) slope towards the shower, using a spirit level with 1:100, 2:100, 3:100 and 4:100 bubbles - I've seen water collected outside other wetroom trays since and was glad I'd done it that way.
 
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Rip down some 4 inch deep lengths of 18mm ply (which you're probably using for the floor anyway) and screw either side of the joists.
 
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Rip down some 4 inch deep lengths of 18mm ply (which you're probably using for the floor anyway) and screw either side of the joists.
aah - there is an easier way of doing it - thanks - I'll use that next time!
 
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so i did option 3.... solid as a rock.
good job i did option 3, the joists were twisted and not a single one was plumb!
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Knew that was coming... Yes indeed, its moisture resistant, that will be fine. (jokes)
its going to be covered with 10mm Elements backer-board taped and sealed, followed by Impey waterguard membrane over the floor with formed corners and both wet walls covered with the membrane followed by UFH and tiles.

I would like to think that there would be no moisture getting to this board, and... if it did then we have a bigger issue than £30 worth of flooring.
 
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