Staff Answer
Sep 28, 2021 - 11:39 AM
It depends on what the composition of the subflooring is and whether it is below grade or not. The installation instructions for Waterproof Marmoleum Click Cinch Loc Seal call for a vapor barrier IF the floor is going over a concrete slab or a floor with radiant heat.
Installation Guide for Marmoleum Click: https://www.greenbuildingsupply.com/c...
You can also install this flooring over an optional underlayment pad that is no thicker than 3mm/ 1/8". QuietWalk Plus is a popular choice with our customers.
