As the title suggests, maybe an easy question but is there any reason to not lay laminate with attached pad on top of underlayment? I removed the laminate floor I had in a room due to a water leak. Now that I've found a replacment floor that has attached pad under it. Half the room still has a 2 in 1 underlayment & vapor barrier that wasn't damaged. I'm thinking should I remove that underlayment and place only a vapor barrier or just cover the rest of the room in the same 2 in 1 underlayment and place the new floor on top?
I'd hate to make a mistake that would cost me to have to pull up the floor at a later date to correct.