Do you need a moisture barrier for vinyl flooring on plywood?

Author: Sandra Hartmann  |  Last update: Thursday, October 16, 2025

Plywood Subfloor: With plywood, an added moisture barrier isn't necessary, but you will want one that offers more comfort and reduces sound noise.

Can you lay vinyl directly on to plywood?

Vinyl flooring can go over a plywood subfloor without a vinyl flooring underlayment as long as the substrate is sturdy, smooth, and flat. If your plywood subfloor is in poor condition, you may need a thin plywood underlayment to smooth the surface out.

What happens if you don't put a moisture barrier under vinyl flooring?

If you don't leave an expansion gap while installing Vinyl Planks, it can lead to warping, buckling, or cracking as the material expands or contracts due to temperature and humidity changes.

Do I need underlayment for vinyl flooring on plywood in bathroom?

Moisture Barrier

Even though vinyl flooring is waterproof, your subfloor isn't. That's why an underlayment acting as a moisture barrier is essential.

What is the best underlayment for vinyl flooring on plywood?

The best underlayment for vinyl flooring varies; foam offers extra cushioning, felt provides sound control and insulation, and cork is great for noise reduction, but not a moisture barrier.

10 Beginner Mistakes Installing Vinyl Plank Flooring

Do you need a moisture barrier under vinyl plank in bathroom?

A plastic moisture barrier acts as a shield, preventing moisture from reaching the vinyl flooring above. This protection is especially crucial in areas prone to dampness, such as basements, bathrooms, and kitchens.? Preservation of Subfloor Integrity: The subfloor serves as the foundation for your vinyl flooring.

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

Both are designed to keep moisture out of your home and can be made from various materials. But there are a few key differences, the most apparent being that moisture barriers are better at keeping out liquids, and vapor barriers are better at keeping out water in its gaseous state.

Does anything go underneath vinyl flooring?

Underlayment is not required if the vinyl flooring will be laid over a cushion-backed vinyl floor or a tile floor below grade. In all other applications, however, you should use one, such as covering existing hardwood floors, vinyl flooring without cushion, and concrete floors.

What thickness plywood for vinyl flooring?

Cover the floor area with either a 4mm or 6mm plywood - the thickness selected should be determined by the quality of the surface being covered. Ply should be of suitable quality, eg SP101. Wood should be fixed using screws, twisted shank or ring shank nails, serrated or divergent staples.

Can you put vinyl plank flooring directly on the subfloor?

Generally speaking, LVP can be installed directly over subfloors such as concrete or ceramic tile assuming they're clean and level. Additional underlayment may be required if installing over existing hardwood or vinyl sheet floors to protect against moisture damage and sound transmission.

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

Luxury vinyl plank manufacturers mention only vapor barrier in their installations. They recommend this due to not allowing (concrete subfloor) getting moisture or alkalinity to your flooring choice. This will eliminate any potential for claims or damages to the manufacturers flooring.

Does the Stainmaster LVP need underlayment?

All Stainmaster luxury vinyl needs underlayment, which isn't a big deal: most floors do. That said, Stainmaster is super picky about the kind of underlayment you use.

Do you need a vapor barrier for vinyl plank flooring on plywood subfloor?

Plywood Subfloor: With plywood, an added moisture barrier isn't necessary, but you will want one that offers more comfort and reduces sound noise.

Can you put vinyl directly on wood?

Yes, definitely wood and vinyl are a good crafting match. Whatever type of wood you want to use, there is a suitable vinyl that you can use to decorate it. Vinyl can certainly adhere to any wooden surface. You can make both indoor and outdoor signs with vinyl and wood.

What is the best adhesive for vinyl to plywood?

Acrylic-based adhesives are very efficient and strong when it comes to gluing vinyl floors. Acrylic-based adhesives are heat-resistant, can handle fluctuations in temperature and do not loosen up due to moisture.

What happens if vinyl flooring gets wet underneath?

If water gets under the vinyl flooring, it's important to lift the affected planks or tiles, dry out the subfloor, and replace the flooring to prevent mould or mildew growth.

Why does my LVP floor crackle when I walk on it?

When you walk on tile, you are pushing it down into the adhesive, and if the tile is not conformed, you are pushing it into contact with the adhesive which causes the clicking/crackling sound. To fix this, you can usually heat the area for at least a day, and then roll the tile using a 100-pound roller.

Does LifeProof LVP need a vapor barrier?

What About a Vapor Barrier? LifeProof installation instructions mention that a vapor barrier isn't required.

What happens if you don't use a vapor barrier?

“For minor projects, the absence of a vapor barrier leads to water intrusion, leading to an unstable foundation or a cracked slab.” The American Society for Testing and Materials (ASTM) outlines national standards for underslab vapor barriers.

What is the best moisture barrier for vinyl plank flooring?

Moisture and mold protection

A thin foam underlayment made of polyethylene or polypropylene usually works best. If you have an attached pad laminate or vinyl floor, our recommendation is the Sentinel Protect Plus Underlayment. This premium underlayment can be used on, below, and above grade.

Is Tyvek considered a moisture barrier?

Is DuPont Tyvek a vapor barrier? No, DuPont Tyvek is not a vapor barrier. It is breathable, allowing moisture vapor to pass through it.

Does vinyl flooring need a vapor barrier?

Typically, moisture barriers are needed when vinyl flooring is installed on top of a concrete subfloor or crawl space. Please refer to the manufacturer guidelines, installation instructions, and warranty information for more details.

How to install vinyl sheet flooring on plywood?

How to Glue Down Sheet Vinyl Flooring
  1. Cut and Nail Down Underlayment. Cut and fasten the flooring underlayment and stagger the seams of the plywood panels, leaving a 1/32-inch gap between panels to allow for expansion. ...
  2. Apply the Adhesive. ...
  3. Cure the Adhesive and Lay Floor. ...
  4. Apply Caulk.

What happens if you don't put underlayment under vinyl plank flooring?

If unprotected, moisture can build up underneath your laminate flooring and cause warping of the planks.

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