Raise floor level for wood flooring

[Arjay12345]

Hi

Any ideas how to pack out a 19mm gap beneath my wood flooring?

I have a 45mm floor differential between my kitchen and hallway. I plan to lay 12mm ply to level over floorboards, and my flooring in 14mm thick. That leaves a 19mm gap I need to fill.

I was going to use different thicknesses of fibre insulating board to pack out, but wonder if that will do anything to the feel when walking over or any other side effects.

Any other ideas?

Thanks..

 

[John D v2.0]

Ply and chip board both come in 18mm. You won't notice a step less than 5mm.