Just had a new 22mm chipboard floor layed on the joists (Obviously!!)  in our new build house but the ensuite and bathroom are 22mm chipboard aswell. Should I treat it or something? Whats the best thing to do.  

If it's green, then it is already moisture resistant and you don't need to do anything

All the builds around my area use green chipboard throughout these days.

their P5 is moisture resistant so you won't need to add anything.

For the Amtico the installer will likely lay a thin sheet of ply, laytex the joints and then lay onto that.

Chipboard is not suitable to tile onto, you will need to overboard it with a minimum of 12mm WPB ply depending on your joist spacing. or if this creates height issues rip up the chipboard and replace with 22mm flooring ply or 25mm WBP ply.


You will need to decide on what floor covering soon as the sanitary ware should sit on top of any tiled surface so the plumber will need to know to set them possibly upto 25mm above the chipboard

Jason
Jason

you can read a bit more here

http://www.sonaeuk.com/04_10_particleboard.htm

I would not apply a sealant as you will only be applying it to one side this will cause an imbalance in the board which may lead to cupping/bowing as moisture in the air will affect one side and not the other.

Jason