uneven floor concrete and wood floortransition

Trying to lay some pir floor insulation over a garage floor then caberdeck. Is there an easy way to do this? The insulation seems to be bent, so laid sand down to compensate but proving a lot harder than we thought. the panels still seem to move when stood on (flexing). Will the weight of the...

Hi all I'm new to this so forgive me if I've posted in the wrong section. We recently had a flood and the insurance won't pay out (long story) but now it's up to me to figure out this problem. The concrete floor and the wooden floor were joined by concrete but when I took up the carpet up it had...