What should the underlayment surface be like for resilient materials such as vinyl or rubber?

For installing resilient materials like vinyl or rubber, the underlayment surface should be smooth and even. This is crucial because a smooth surface helps to create a stable and uniform base for the resilient flooring. If the underlayment is uneven or textured, it can lead to an irregular installation that might be uncomfortable underfoot, and could even cause premature wear or damage to the flooring material itself.

A smooth and even underlayment reduces the risk of trapping air bubbles or moisture beneath the flooring, which could compromise the integrity and longevity of the vinyl or rubber. Furthermore, many resilient flooring products are designed to adhere properly only to a flat surface, maximizing adhesion and ensuring a level finish throughout the floor.