Shimming Chipboard Flooring to Level After Replacing Floorboards Information, tips and advice on all aspects of home and buildings insurance

[texteditor]

I am replacing floorboards (nominally 22 mm thick) with chipboard (nominally 18 mm thick)
I was expecting a 4 mm height difference which I was going to compensate for with 3 mm harboard (1 mm difference to be absorbed by underlay)
in fact the height difference varies from 1 mm to 3 mm so I am looking for various thickness shims to compensate any ideas?
Thanks, texteditor.

[welsh brickie]

Try fixing new timbers to the existing joists rather than shims to can fix the new timber to the exact height you want and levelthe floor