Originally Posted by orna
Is it true that we need to replace the particle board sub-floor in order to install a hard floor? ply wood sub floor will be much better?
The modulus of elasticity (MOE) is a measure of stiffness.
For MDF it's 0.53, for particle board it's 0.7, for fir plywood it's 1.2
so plywood is definitely stiffer.
MDF FAQ - Tutorial
What stiffness do you need?