I am going to replace the carpet in my three seasons porch with vinyl plank from Costco. I pulled up the carpet and found a layer of carpet underneath. Should I remove both, or could I install the plank over the bottom layer? I'd have to remove the tack strips. I'm worried there's a reason they didn't remove the bottom layer to begin with. It seems to be totally glued down.
Could I install the vinyl flooring over the top layer?