How thick should underlay be for floating floors?

Author: Gianni Wilkinson  |  Last update: Wednesday, July 16, 2025

It should be at least 3mm thick to provide comfort and ground levelling properties. But, it should be no more than 5mm thick. If it's any thicker, you could experience problems with the laminate's locking system.

What is the best thickness for floating flooring?

10mm – 12mm laminate thickness

10mm thickness is where manufacturers really start to take things seriously. It's where most of the performance problems that come with thinner laminate are eliminated.

How thick should LVP underlayment be?

Most vinyl plank flooring manufacturers specify the maximum allowable underlayment thickness, typically ranging from 1mm to 3mm. It is crucial to follow these guidelines to avoid voiding the warranty or causing damage to the flooring.

What do you put under a floating floor?

Underlayment, or “padding” as it's often called, is the spongy, closed-cell plastic foam sheet that comes in rolls. It is rolled out between the actual laminate flooring planks and the subfloor.

Can underlayment be too thick?

Choosing a thick (10mm+) underlay for your stairs is not a good idea as it can pose a trip hazard. Moreover, thicker carpet underlays tend to compress slightly with heavy use, which can lead to irregular wear and unsightly lumps, particularly in frequently trodden areas.

Choosing the Best Underlay For Laminate & Wood Flooring

Does underlayment have to be perfectly flat?

No subfloor is perfectly level, but any signs of unevenness and high or low spots must be remedied. Please follow these requirements: Subfloor unevenness cannot be greater than 3/16 of an inch over a 10-foot span or 1/8 inch over a 6-foot span. Subfloors must not slope more than ½ inch per 6 feet (25 mm per 1.8 m)

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.

What are the disadvantages of floating floors?

- Durability: floating flooring is not as durable a solution as glue-down flooring; - Noisier inside the house: the way it is installed means that there is space between each layer, and because of this this this type of floor can cause more noise when you walk around inside the house.

How do you prepare a subfloor for a floating floor?

Your subfloor must be:
  1. Level within 3/16 inch for every 10 feet. Grout lines must be filled in if using tile as a subfloor. ...
  2. Flat.
  3. Cleaned. All dust and debris should be swept.
  4. Structurally sound. Clear of any nails, loose screws that squeak or are damaged, or any parts that were damaged by moisture.
  5. Dry.

Do floating floors need a vapor barrier?

Additionally, if you're installing a floating floor (where the planks or tiles are not glued down), a separate underlayment with a built-in vapor barrier may be beneficial for added protection. At Havens Hardwood Floors, Inc., we always prioritize the long-term durability and performance of your flooring.

What is the best underlayment for vinyl plank flooring?

The choice of underlayment for your vinyl plank flooring ultimately depends on your specific needs and the conditions of your space. However, experts often recommend foam or felt underlayment for their sound reduction, protection from moisture, and insulation properties.

Is a 20 mil wear layer good?

The 20-22 mil thickness can actually withstand commercial environments. Choose flooring with a middle or higher wear layer if it will be in a high-traffic area of your home. A thinner thickness will be fine if the room in issue is unlikely to have substantial foot traffic. 12 mil works just fine in residential homes.

Do I need a moisture barrier under vinyl plank flooring?

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 much of a gap do you leave for a floating floor?

Generally, a gap of 1/4 inch to 1/2 inch is recommended for hardwood flooring, while laminate flooring typically requires a gap of 1/4 inch to 3/8 inch. It's important to note that the expansion gap should be consistent throughout the room, including around obstacles such as doorways, cabinets, and pipes.

Is 5mm LVP too thin?

While there might be concerns about 5mm Luxury Vinyl Flooring being too thin, its durability depends more on the wear layer than the overall thickness. For example, a 5mm flooring option with a 0.5mm wear layer provides ample durability for most residential applications.

What is the easiest floating floor to install?

Vinyl plank flooring offers a hassle-free installation process with click-lock, floating, and interlocking features, making it an easy-to-install and resilient choice for DIY home improvement and renovation projects.

Do you put anything under a floating floor?

The answer will vary depending on the material used for the floor and the way that the boards are constructed, but, as a general rule, both Laminate and Engineered Timber floating floors do need some form of underlay to have optimal functionality and longevity.

Can you install LVP directly on a subfloor?

When installing LVP flooring in your home, it's important to know what types of surfaces it can be installed over. Generally speaking, LVP can be installed directly over subfloors such as concrete or ceramic tile assuming they're clean and level.

What is the lifespan of a floating floor?

On average, laminate flooring can last 15 to 25 years with proper care and maintenance. However, some higher-quality laminate floors can last even longer, potentially up to 30 years.

Is it normal for a floating floor to bounce?

A floating floor can have a slight bounce or give underfoot, but it should not feel excessively bouncy or unstable.

What holds a floating floor in place?

How does a floating floor stay in place? Floating floors connect at the seams using a tongue and groove or interlocking system. Once installed, the weight of the floating floor keeps the floor in place for years.

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.

What voids the warranty on vinyl plank flooring?

Accidents, abuse or misuse; • Extreme heat or cold; • Scratching, impact or cutting; • Improper workmanship or installation not in accordance with Dezign North America installation instructions; • Improper maintenance; • Improper fabrication; • Freight damage; • Damages by acts of God; • Planks coming apart at the ...

Why is there moisture under my vinyl plank flooring?

It's all caused because of the low vapor permeability of the LVF material combined with the building methods that allow for the presence of condensation buildup due to the transfer of humid air from warm to much cooler surfaces such as luxury vinyl flooring.

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