Vapor Barrier Over Wood Subfloor

Vapor barrier 2 in 1 underlayment.

Vapor barrier over wood subfloor.

You can purchase foam or vinyl underlays with built in vapor protection. The house was built back in 1926. Permeable membranes slow seasonal changes in moisture vapor movement enough to give hardwood flooring over wood subfloors some protection. Mike in victoria writes i m putting a new subfloor on a pier and beam foundation do i need a vapor barrier between the floor joist and the plywood.

The solution is to insulate the underside of the floor sheathing with closed cell spray polyurethane foam or to install a continuous horizontal layer of foil faced polyiso with taped seams under the floor joists. The fact of the matter is that tens of thousands of hot climate homes have vapor barrier flooring over crawl spaces. You can meet the vapor barrier requirement by stapling 6 mil plastic sheeting or tar paper to the subfloor but there are better underlay options. They provide sound and thermal insulation as well as moisture protection.

If you re installing it over concrete and you have a question about moisture issues consider adding a vapor barrier underlayment first that will product against water problems. Just ensure any underlayment you add is thin so it doesn t impact the locking process of the vinyl planks. Acoustical underlayment w vapor barrier for luxury vinyl flooring 54 pack model qwlv100 2 430 00. The visqueen acts as a barrier between the flooring and the sub floor and allows the vinyl planks to float above the sub floor and smoothly expand and contract with the temperature and humidity changes in your home.

Unroll the underlayment and moisture barrier if needed in long strips joining each row with tape being careful not to overlap the edges. This 2 in 1 underlayment will allow your laminate flooring to float while correcting any minor subfloor imperfections and will protect your floors from moisture. We are talking about a glue down install of engineered wood over an on grade slab. First vapor barrier on the concrete slab one of companies always uses a vapor barrier flooring vinyl on all their jobs.

The other two says it depends on our area of the valley and our slab. It is not required but we recommend using the visqueen vapor barrier with all vinyl plank flooring installations.