Bathroom flooring

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Hi all I’m in the process of removing the sloping floor from a wet room to reinstall a bathtub. Where they’ve cut away the floorboards would it be ok to replace with marine ply or even normal ply? Any info would be grateful thanks
 
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Not the best photo but you can see what I mean
 

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You would be better using T & G chipboard flooring as it will be nearer the thickness of any old floorboards (assuming 22mm) you marry up to and also is tongued so can be glued and will make it stronger than butt jointed ply.
 
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Sister something onto that joist that has been notched to oblivion mid span, jeez..

Some of em really do put the "plum" in "plumber"
 
Hi all I’m in the process of removing the sloping floor from a wet room to reinstall a bathtub. Where they’ve cut away the floorboards would it be ok to replace with marine ply or even normal ply? Any info would be grateful thanks

Marine ply is the best stuff. I think 18mm or 25mm.

The Indonesian stuff I'm told is good.
 
Use large uncut sheets as much as possible, in high traffic areas (e.g. doorway, in front of basin and WC), filling in round the edges with cut pieces where you will not be standing or walking much Put the joints in the ply sheets on joists. Add "noggins" (struts) under any unsupported joints. This is especially important if using square edge boards. You can seal the edges to prevent damp getting in, since bathrooms usually contain water, spills, splashes and leaks.

Measure where the feet of the bath will be and provide extra support spanning the joists if feet will not coincide. Especially if the joist has been hacked about with an axe or chainsaw.

You are unlikely to find true marine ply (which is expensive, made of selected quality veneers) but can probably find a WBP grade. It still needs the edges sealed. You can stain and varnish the whole floor (top, bottom and sides) if you want for improved appearance and water resistance.

If there are any waste traps or other parts that might need to be accessed in future, e.g. under the bath, provide a screw-down hatch you can remove.
 
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How come you put the nice boards under the bath and the gash split one out in the room?
 
Had to cut a piece out when the plumber put the bath waste there.

The bath panel conceals it.

When I started out they were all nice.
 

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