Vapor Barrier Over Plywood Subfloor

Do i need a vapor barrier between the floor joist and the plywood.

Vapor barrier over plywood subfloor.

We are also considering topping off the rigid insulation about 1 1 2 inches with loose fill insulation as normally used in attics. Vapor barrier 2 in 1 underlayment. You don t need 6 mil poly above the plywood. Then we are applying a 6 mil polyethylene vapor barrier over the entire area which will be covered by 3 4 inch plywood underlayment a carpet pad and carpeting.

Use vapor barrier 2 in 1 when installing laminate flooring on cement subfloors or any subfloors with a risk of moisture coming up. If you have a plywood subfloor over a concrete slab check the moisture level of both floors. 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. Set your store to see local availability add to cart.

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. Mike in victoria writes i m putting a new subfloor on a pier and beam foundation. Acoustical underlayment w vapor barrier for luxury vinyl flooring 54 pack model qwlv100 2 430 00 roll 2 430 00 roll free delivery. What you need is closed cell spray polyurethane foam on the underside of the plywood to provide a vapor retarder and insulation layer to separate the plywood from the humid crawlspace below.

The house was built back in 1926. View all tools materials. In a cold climate it s fine where it is. You want the vapor barrier on the warm in winter side.

You can purchase foam or vinyl underlays with built in vapor protection. 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. Select 2 to 4 items to compare. They provide sound and thermal insulation as well as moisture protection.

This is also an extra piece of protection if you have any water leaking underneath the vinyl planks. Underlayment and moisture vapor barrier as required by the manufacturer. What you want to do is keep the plywood dry. Drybarrier is a modular subfloor tile system made from thermoplastic elastomer and is used on concrete as a subfloor for below grade slab on grade and suspended slab construction.