22mm Chipboard for bathroom floor. wrong size? (Ed..

[Trevtherevs]

After a radiator pipe broke and flooded the bathroom, I have a really soft and spongy floor. The house was built in mid 70's and has 3/4" chipboard, I am intending to replace it with a new floor. I was told that I should get 22mm P5 chipboard. So here's my problem as the water isn't educated and went where it wanted, it has also weakened some flooring on the landing. I have removed the skirting and was hoping to edge the new board under and refit smaller skirting. But how do I run the new thickness and the original on the landing? Could I recess where the joist is and blend it in to the bathroom until it at the new thickness? I was going to have 19mm, but the merchant said I would struggle to get anything to match up. However, I don't know how I can avoid a step between the two floors.

 

[Wayners]

¾ inch is 18mm chipboard I thought?

 

[Wayners]

Fact checked myself. Yeah.

• Thickness (mm):18mm
• Thickness (Imperial):3/4 inch

 

[Trevtherevs]

Maybe i'm overcomplicating things. Being an engineer, I do tend to make my life a torture 3/4 - .750"
18mm = .708" so a millimetre smaller

 

[Trevtherevs]

Yeah, I think I can pack out any low boards a lot easier than relieve the backs. Thanks for pushing me in the right direction. You might get the feeling I'm not in the zone for this job, and you would be right so much to do and so little time.