I have experimented SPC installation with 3mm rubber carpet underlay recently.

The feeling is firm and zero bouncy. Also, carpet underlay is fire retardant and so is SPC unlike the default 3mm PE foam.

Costwise, slightly higher than PE foam and movable. U can recover at least 80% of the underlay and about 70% of the SPC should u decided to move 1 day.

This post has been edited by acbc: Feb 26 2023, 11:49 AM