It seems laminate plank or vinyl plank flooring is becoming overly popular. Ranging from $1.50 a square foot up to over $6 a square foot it sure is a wide range. I'm seeing the higher end floors come with padding on the bottom already glued by the factory. They claim no padded underlayment is needed that way. But in new construction the typical subfloor is just 3/4" OSB.
I don't see the osb with cracks and defects being a good subfloor choice. Would simply using 1/4" 4' x 8' sheets of underlayment be a sufficient base for these new plank floors? I assume less detail would be needed such as not needing to putty the seams and staple holes in the underlayment. I like that it would raise the plank more to be level with any carpet or tile transitions. But I'm wondering what you guys have used for a solid base layer before installing these floating snap and lock laminate or vinyl planks?