I am renovating a house to sell. Do I have to pull up the pad from the previous flooring if it is still good? I already purchased the plastic 2 way stuff that goes with my laminate flooring. I could take it back and save some money. Opinions please!
Is the laminate going on a concrete or plywood subfloor? If concrete, make sure your underlayment has a vapor barrier or put one down before the underlayment.
If the existing pad you're asking about was for a carpet, definitely pull it up first. There's far too much "give" in a carpet pad for laminate. The planks will move each time they're walked on and eventually lead to failure of the T&G locking system.