We have a bedroom (in a Victorian terrace) which has currently got laminate flooring in lay on top of 8/9mm green underlay boards. For various reasons we would like to now carpet this room and having taken up the laminate I see that the green underlay boards are doing a very good job of covering some of the larger gaps between the floorboards as well as providing a much smoother surface than the otherwise (slightly) undulating floor (I've seen worse, however there are some noticable edges to some of the floorboards).
My question is this: Are there any reasons why I couldn't/shouldn't keep these green boards down and lay underlay and carpet on top of them? In addition to providing a gap-free surface (they're well butted up wall-to-wall - so much so you can barely see the joins) I thought it may also help slightly as an acoustic barrier?
I initially had reservations that the carpet may end up being a bit too spongy (I once rented a room that had at least three carpets laid on top of each other - it was like walking on a bouncy castle) however the green boards are fairly hard or at least they don't noticably compress underfoot. Other problems may include the length of the nails on the gripper rods (can also whack in longer ones though) and/or the carpet may benefit from a more 'secure' surface (however I would've thought the actual underlay would negate that anyway).
Can the panel offer their thoughts on this plan?
Mathew