Vapor Barrier Over Plywood Subfloor

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.

Vapor barrier over plywood subfloor.

Mike in victoria writes i m putting a new subfloor on a pier and beam foundation. Use vapor barrier 2 in 1 when installing laminate flooring on cement subfloors or any subfloors with a risk of moisture coming up. Select 2 to 4 items to compare. 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.

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. If i m understanding you the vapor barrier is just beneath the subfloor but on top of the joists. You can purchase foam or vinyl underlays with built in vapor protection. This is also an extra piece of protection if you have any water leaking underneath the vinyl planks.

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. Underlayment and moisture vapor barrier as required by the manufacturer.

They provide sound and thermal insulation as well as moisture protection. You don t need 6 mil poly above the plywood. Do i need a vapor barrier between the floor joist and the plywood. 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 tiles snap together in a stack bond or running bond pattern providing a vapour barrier with a 1 4 air space between the concrete and finished floor. If you have a plywood subfloor over a concrete slab check the moisture level of both floors. The house was built back in 1926. But check the flooring instructions to find out if your home needs a moisture barrier between the subfloor and plank.

We are also considering topping off the rigid insulation about 1 1 2 inches with loose fill insulation as normally used in attics. 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. What you want to do is keep the plywood dry. 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.