Do I need a moisture barrier under vinyl plank flooring?

Author: Raleigh McCullough  |  Last update: Friday, July 1, 2022

For vinyl flooring installations over wood subfloors, you will not need to worry about a moisture barrier, but you may want an underlayment for added cushion or sound reduction. It may also be a requirement in certain HOA or apartment complexes to have a sound barrier with your flooring.

Can moisture get under vinyl plank flooring?

Vinyl plank flooring is often revered for its water resistance property. No wonder it has become a flooring favorite of many homeowners. However, if constantly exposed to water for long, it can seep through vinyl planks inviting various unwanted problems, including molds.

Do you need a moisture barrier under vinyl plank flooring on concrete?

Vinyl floors under 4mm should be installed right over the subfloor. If you have any areas on a concrete subfloor with moisture concerns, it is recommended to use a vapor barrier underlayment that will not add any cushion to the planks.

Do you need a membrane under vinyl plank flooring?

Vinyl planks require hard, thin underlay because the product itself is softer. Putting a soft product under vinyl plank will result in an unstable floor that is much more inclined to being damaged and even punctured or torn over time.

Does vinyl flooring need moisture barrier?

Existing Flooring

Meaning, if you're going to install vinyl plank flooring over tile, vinyl flooring, and even hardwood. As with the plywood floor, there's no need to worry about a moisture barrier; the underlayment should provide cushioning and sound-deadening benefits.

Floor Moisture Barrier - When Do I Need It?

What should I put under vinyl plank flooring?

Plywood is often the most commonly used type of underlayment in vinyl plank flooring installation. Sheets of 4×8 foot plywood, usually ¼ to ½ inch thick tend to be an excellent flooring underlayment for many subfloors including wood, tile, and linoleum.

Is vapor barrier necessary?

A vapour barrier is an important component in building construction. Its purpose is to help prevent water vapour from reaching building walls, ceilings, attics, crawlspaces or roofs, where it can condense and cause building materials to rot or grow mould.

Is underlayment necessary for luxury vinyl plank flooring?

Any type of flooring can benefit from an underlayment — even luxury vinyl tile. This holds true no matter what type of subfloor it will be installed on, including concrete, wood flooring, or any other type of flooring. Underlayment can improve the vinyl tile's ability to absorb sound.

Can mold grow under vinyl flooring on concrete?

Yes, mold can grow under vinyl flooring on concrete. This is one of the most common issues faced by people buying a house without knowing how to properly assess the condition of the floor and subfloor.

Does Lifeproof vinyl plank flooring need a vapor barrier?

All flooring is still acceptable to excessive moisture, alkalis in the subfloor and conditions arising from hydrostatic pressure. This is why we recommend installing a 6 mil vapor barrier under the floor which will block all moisture/chemicals from reaching your brand new flooring.

Do you need to waterproof under vinyl?

Moisture build up beneath vinyls where negative pressures result in membrane failure and adhesive failure – One of the reasons that we are required to waterproof beneath vinyl is the presence and build-up of condensation beneath the vinyl.

What happens if water gets under luxury vinyl plank?

Warping, buckling, and discoloration are all indicators of water or moisture damage on vinyl floor planks. The crawlspace is an excellent place to look if you suspect that your vinyl floor is getting damaged because of a wet subfloor. Mold can grow on the floor joints if there is a lot of moisture in the air.

What are the disadvantages of vinyl plank flooring?

Some disadvantages of vinyl flooring include:
  • Cannot be repaired.
  • Can emit volatile organic compounds (VOCs)
  • Shorter lifespan than wood floors.
  • No impact, or negative impact, on home resale value.
  • Difficult to remove, especially if adhesive is used during installation.
  • Not eco-friendly; difficult to recycle.

Can I install vinyl plank flooring over concrete?

Yes, and that's one of the questions we hear most often is about luxury vinyl plank (LVP). Most homes in Florida don't have basements so, rather than an actual concrete subfloor, the concrete is a slab-on-grade, meaning no basement floors and no walls.

What can I put under vinyl to prevent mold?

A moisture barrier is simply a sheet of plastic that goes between the vinyl flooring and the subfloor to prevent any moisture that penetrates the subfloor from reaching the vinyl. You can buy it separately or get an underlayment with one built-in.

Can vinyl floor be installed over concrete?

Generally speaking, you can install vinyl tile directly over concrete, provided there are not any serious problems with the concrete floor. Any concrete floor used as a subfloor for vinyl tile must be clean, dry, and smooth. If there are any cracks or holes, they must be repaired first.

Can you install vinyl plank flooring over plywood?

Can I install vinyl flooring over wood, plywood, particleboard or chipboard? You can install vinyl over wood floors if you put a plywood subfloor on top of it. Do not install glue down or peel and stick products over particleboard, chipboard or any form of embossed floor.

What is the difference between a vapor barrier and a moisture barrier?

Moisture barriers function to help in preventing water from entering inside of the wall cavity. On the other hand, vapor barriers basically prevent water vapor from the interior of the house to filter through the wall and condense on the warm side of the insulation.

Where should vapor barrier be installed?

Vapor barriers are usually best installed on the side of the wall that experiences the hotter temperature and moister conditions: the inner surface in colder climates and the outer surface in hot, humid climates. In existing spaces, oil-based paints or vapor-barrier latex paints offer an effective moisture barrier.

When should I use vapor barrier on floor?

Vapor barriers should be used on a floor when the area is prone to moisture. When moisture penetrates your flooring, it can cause mold, mildew, and the potential for water damage. A moisture barrier helps control the water vapor's movement to help protect your floors.

What is the lifespan of vinyl plank flooring?

Vinyl floors can last anywhere from 5 to 25 years, depending on their quality and how they're installed and maintained.

What is the difference between vinyl plank flooring and luxury vinyl plank flooring?

LVT (Luxury Vinyl Tile) and LVP (Luxury Vinyl Plank) are two different types of luxury vinyl flooring. LVT is vinyl flooring designed in a tile shape, whereas LVP is vinyl flooring designed in planks to resemble traditional hardwood floor planks.

Is vinyl plank flooring OK for bathrooms?

Vinyl – Vinyl plank flooring is extremely durable and waterproof, making it a natural choice for basements, bathrooms, and kitchens.

Does vinyl plank flooring leak?

Luxury vinyl planks (or tiles) are, in themselves, completely water-proof and cannot be damaged by exposure to moisture. For that reason they are an excellent choice for laundry rooms, bathrooms, kitchens and other areas where moisture is around.

What happens if vinyl plank flooring gets wet?

Use your Shop Vac or a mop to pull up the floodwater quickly and begin running dehumidifiers and fans immediately. Then call your installer. If your vinyl is a floating floor or click clack, you may be able to remove a portion of the planks and use a Shop Vac to blow air under the floor to dry out the subfloor.

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