Lowering timber floor by 20mm

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We are trying to keep the entire house floors flush throughout. The bathrooms are all going to be tiled, and so a tiler has recommended allowing 20mm for this.

Current floor beams are 125x50mm rough sawn, span between sleeper walls is 2.2m. I am keen to avoid having to reduce the sleeper walls, and am thinking of replacing the existing timber with 95x74mm timber, at 400mm centres, and plenty of noggins.

Is this reasonable? This size doesn't appear on any span tables I can find. I would then fit wooden or lead packers to bring it up a little, and even it out.

Any other ideas welcomed, also!

Thank you
 
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Is it the bathrooms you want to lower? An old trick is to fix battens to the sides of the joists, down the thickness of your flooring (eg 22mm) and drop strips of flooring in. For a tile finish you'd glue/screw cement boards on top. You can hide a reasonable difference in levels at the threshold.
 
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Is it the bathrooms you want to lower? An old trick is to fix battens to the sides of the joists, down the thickness of your flooring (eg 22mm) and drop strips of flooring in. For a tile finish you'd glue/screw cement boards on top. You can hide a reasonable difference in levels at the threshold.
es, the bathrooms are to be lowered.

Nice trick, and I'd never have thought of it! As it happens, I need to remove the floor, anyway. I need to run the 110mm drainage underneath, and lifting the joists seems like an easier method to do that. The joists only serve this space, so lifting them up will be pretty straight forward.

I'd be all for hiding it at the threshold, but SWMBO has different ideas :D
 

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