What are the requirements for a vinyl subfloor?

Author: Prof. Conrad McGlynn  |  Last update: Tuesday, June 9, 2026

Subfloor Preparation: Subfloor should be flat within a tolerance of 1/8” over a span of 4 feet. Any unevenness over 1/8” must be sanded down or filled with a floor leveler. Voids or humps in the subfloor will prevent luxury vinyl from locking properly.

What should go under vinyl flooring?

What Goes Under Vinyl Floors?
  • Cork Underlayment. Cork is an excellent option for reducing noise in your home. ...
  • Particle Board Underlayment. Particle board is an inexpensive way to lay a level base under vinyl flooring. ...
  • Plywood and OSB Underlayment.

What base do I need for vinyl flooring?

Foam: Being one of the least expensive underlayments you can buy, foam fits as the perfect choice to be put under your vinyl floor, especially if your subfloor is made of plywood. However, make sure that you have no moisture issues as foam and water aren't a good combination when it comes to flooring.

How smooth does the subfloor need to be for LVP?

Use the proper leveling compounds to provide a flat surface – subfloors should be 3/16” in 10' or 1/8”: in 6' – the use of a 6' level can help to determine the flatness of the subfloor.

What should vinyl flooring be laid on?

What do you put down before vinyl flooring? As discussed in this guide, it's important to create a completely flat and level surface before laying vinyl flooring. In most cases, this means adding a layer of thin plywood on top of your floorboards, secured with small tack nails.

Do I Need An Underlayment For My LVP Flooring?

What are the requirements for vinyl flooring?

The subfloor surface must be smooth, flat, dry, clean and solid. Carpet staples or adhesive residue must be removed to ensure proper installation. Subfloor should be flat within a tolerance of 1/8” over a span of 4 feet. Any unevenness over 1/8” must be sanded down or filled with a floor leveler.

What does vinyl flooring sit on?

vinyl plank flooring in your kitchen or bedroom. You can easily install it over any rigid and level surface, including concrete, wood or even up to one layer of other vinyl.

Can you put vinyl flooring directly on 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.

Does floor have to be perfectly level for vinyl plank flooring?

A flat and level floor is key so that the adjoining vinyl plank flooring doesn't have varying heights. It is absolutely essential that the subfloor is completely level.

How to prep a subfloor for vinyl?

Preparing a Concrete Subfloor for Luxury Vinyl Flooring
  1. Test the moisture content of your concrete subfloor. ...
  2. Thoroughly clean your subfloor. ...
  3. Check your subfloor to make sure it is level. ...
  4. Level your floor by filling low spots with patching compound and a putty knife. ...
  5. Use a belt sander to reduce high spots.

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

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. Therefore, if you're installing floors in an area that sees moisture, even a little, a vapor barrier is needed.

What thickness plywood under 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.

How soon can you walk on vinyl flooring after installation?

After you've installed brand-new vinyl flooring, you should wait at least a day before walking on it because: The seams need to cure: The adhesive under your vinyl plank or tile flooring needs at least a day to acclimate to the floor underneath it after installation.

What goes between subfloor and vinyl flooring?

Most modern vinyl flooring, such as Happy Feet, comes with an attached underlayment or pad, often with a moisture barrier built-in – unless the pad is cork. If the product you choose doesn't have an attached underlayment, you can almost always install directly over the subfloor without one.

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.

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

There is no need for a moisture barrier when installing on plywood.

What happens if you put vinyl plank on uneven floor?

Floating vinyl planks, installed without adhesive, can accommodate slight floor irregularities. On the other hand, glue-down method offers a stronger bond and is ideal for more uneven surfaces, like a mountaineer who seeks a solid foothold on rugged terrains.

Does it matter which direction you lay vinyl plank flooring?

The path most traveled in a room also dictates a sensible direction for your vinyl planks. Laying the planks parallel to the main traffic flow does a couple of things. First, it creates a visual elongation of the space, making the journey through the room feel more direct and spacious.

What is the flatness tolerance of a subfloor?

The Standard simply defines the required flatness of a concrete subfloor. The subfloor, or 'underfloor' as I like to call it, “shall not deviate more than 3/16 of an inch in ten feet.” Photo 1 shows a ten straight edge being used to gauge the undulation of the floor.

How to fix uneven subfloor for vinyl plank?

Depending on the situation, you can either sand down areas of the subfloor that are too high, or install shims beneath the subfloor so that the entire floor is brought up to the same level.

What should I put down before laying vinyl flooring?

Get some 1/8" Hardboard, Lauan or birch plywood (one side smooth) and lay it down without gaps over the sub floor. At this thickness, you can staple it down. smooth any edges/fill any gaps. Lay your vinyl.

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.

Can you put a refrigerator on vinyl plank flooring?

Since most furniture will not go under just one plank, it is perfectly safe for bulky furniture and refrigerators to go on vinyl plank flooring. Vinyl plank flooring will not be damaged or cracked by home appliances' weight due to its strong durability.

What is a negative of vinyl flooring?

The disadvantages of vinyl floors

Cannot be repaired. Can emit volatile organic compounds (VOCs) Shorter lifespan than wood floors.

Can you use a rolling chair on vinyl plank flooring?

Even with a protective wear layer, over time, rolling desk chairs or desks with little wheels at the bottom can cause wear and tear and damage your vinyl flooring.

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