Installing Laminate Flooring With Attached Padded Underlayment

Laminate plank with underlayment attached

The Spruce / Kevin Norris

Unlike floors that have a high degree of tolerance for problems such as moisture and wear, laminate flooring works only as long as you take proper precautions. Tightly seaming the boards to protect them from moisture is one such precaution. Another precaution is installing underlayment below the planks. You have two choices: purchasing laminate flooring with attached or unattached underlayment padding.


If you're installing flooring, make sure that the substrate the flooring is being installed over is level and free of imperfections.

Pre-Attached vs. Separate Underlayment

Laminate flooring manufacturers always recommend having an underlayment under the boards. Underlayment can help to smooth over small imperfections in the subfloor (substrate); provide minor sound absorption; and soften footfall.

Underlayment is found in two forms:

  • Separate: Rolls of 3 mm polyethylene foam or felt underlayment laid on the subfloor prior to installation and taped side-to-side.
  • Attached: Underlayment may be pre-attached by the manufacturer to the bottom of the laminate planks. Not only does this eliminate the preliminary step of rolling out underlayment, you are prevented from using separate underlayment--the flooring would not lay correctly.

Should You Buy Unattached Laminate Padding?

Laminate manufacturers are going the way of producing more planks with pre-attached underlayment than planks that require separate underlayment. Even so, buying laminate flooring with separate underlayment is always a viable option because it gives you control over the installation and it helps widen the pool of available products.

With thinner flooring, sound may be a problem. If so, you may wish to pair 12 mm thick laminate with heavy felt underlayment for high quality, though expensive, laminate floor. If smoothing out the substrate is your only aim, you may want to purchase closed cell polyethylene underlayment for a less expensive flooring product.

Features of Separate Underlayment Padding

  • Inexpensive: Polyethylene foam underlayment, the cheapest you can purchase, costs as little as $0.15 per square foot.
  • Improves Thin Laminate: Buying an inexpensive laminate floor usually means that you are also buying thin laminate. Boards under 8 mm qualify as thin. Lumber Liquidators, as an example, sells laminate flooring in the 2 mm-thick range. To put that in perspective, two U.S. dimes are thicker than 2 mm. With this product, underlayment is not just a good idea, it is necessary.
  • Control: You can choose your underlayment and not have it chosen for you, which helps control the overall cost and quality of floor installation.

Brands With Unattached Padding

At one time, nearly all laminate required separate underlayment. These are now becoming more difficult to find. A few brands and lines that do not have attached underlayment are:

  • Pergo Portfolio
  • Shaw laminates without the suffix "Plus"
  • Many Lumber Liquidators Dream Home laminates
  • Lowe's Style Selections brand
  • Home Depot's Trafficmaster brand
  • Most laminates under 10 mm thick

Types of Laminate Flooring Underlayment

Foam Underlayment

Foam underlayment is usually less expensive than felt underlayment. Lighter foam does little more than smooth out the substrate and it has practically no sound-absorbing qualities. Heavier, denser foam is better at limiting the transmission of sound but only by little. Still, foam underlayment is the most popular type of laminate floor padding, mainly because it is economical, waterproof, and easy to work with.

Felt Underlayment

Felt underlayment tends to be over four times heavier than foam and at least twice as expensive. This recycled product carries higher sound absorption ratings than other underlayment types. Many flooring companies recommend felt underlayment.

Pre-Attached Underlayment Features

Saves Installation Time

Eliminating one step from the process of installing laminate flooring may reduce the overall time spent on the project. Note that it usually takes little time to lay out and tape separate underlayment. Budget about thirty minutes to install underlayment in a 400 square foot room. So, even though using laminate flooring with pre-attached padding does save time, the amount of time saved is negligible.


Laminate flooring with pre-attached underlayment padding tends to be thinner: around 2 mm. Separate underlayment is slightly thicker, at 3 mm.

Underlayment Gaps

Every board has its own underlayment, which means that there is no continuous underlayment running across the entire area of the room.

Laminate Flooring With Attached Padding

Laminate companies are slowly filling their catalogs with more attached-padding flooring. For example, laminate floor originator and leader Pergo now has a catalog with pre-attached underlayment padding on over 75-percent of its products.

  • Lumber Liquidators Dream Home and Dream Home XD, mostly confined to the 10 mm and 12 mm thicknesses
  • Pergo XP, Pergo Max, Pergo Outlast+
  • Lowe's Allen + Roth
  • Shaw laminates with the suffix "Plus" typically have attached padding (for example, Shaw Biltmore Plus)