I am laying engineered wood floating floor in my sub-basement bed rooms over cement sub-floor. I got "Eco cork form:" underlayment from Home depot. It has built in 6-mil vapour barrier. I am thinking to add an additional plastic sheet for moisture barrier and need the experts advise here. Is it recommended? Any pros or cons?
It is not necessary to add an additional moisture barrier to your underlay. The cork has the required barrier as the top layer and has an adhesive strip built in that you need to use along the sides. You will need to use Tuck Tape on any seams that do not have the adhesive strips, ie where you might join a roll to another.
Test the substrate's moisture levels before installation begins. If you find excessive moisture vapor emission rates, use a moisture mitigation system like The LiquiDAM prior to installation.
Fill any voids or deflections in your substrate with a cementitious patch, like TEC Fast-Set Deep Patch, or a self-leveling underlayment
Engineered hardwood expands and contracts because of changes in moisture levels. For that reason, make sure you use an adhesive that contains no water like a moisture cure urethane or modified silicone adhesive. Your adhesive needs to combine bond strength and flexibility
Otherwise if there is no issues with moisture then the cork is good enough
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