Pergo Underlayment
Q: I am going to install a 12mm laminate over new concrete slab. The slab has some imperfections, notably some uneveness, noticeable only when laying a long straight edge on the floor, also some roughness. The installer swears he has used a 1/4″ thick 2-in-1 underlayment in the past, claims it was from Pergo, and if that is used the resulting floor will be perfect.
I have not seen or heard of any underlayment this thick. I’ve got the Pergo Softseal, the installer says what he used previously was much thicker.
Are there any underlayments 1/4″ thick?
A: I can’t say that I know of a 1/4″ underlayment made by Pergo, but 6mm cork is roughly 1/4″ thick, so there are some underlayments out there which are 1/4″ thick, but aside from carpet padding or cork I can’t think of any wood flooring underlayment that is a foam type or oil-based (like Pergo’s) which is that thick.
Regardless, your subfloor should be leveled out if there are variations in height of more than 1/32″. You could go as far as 1/16″, but even then its best to level out the subfloor to ensure that you get a floor which not only sounds and feels great, but will stay that way for a long time with proper maintenance.