Blog > The Most Overlooked Step in Choosing Flooring: Underlay Matters More Than You Think

The Most Overlooked Step in Choosing Flooring: Underlay Matters More Than You Think

Tuesday, August 26, 2025

When it comes to choosing new flooring, most people are laser-focused on what’s on top—color, finish, wood grain, tile shape, or carpet pattern. And we get it! Style is important. But the most important part of your floor? It’s the part you don’t see.

Underlay (also called underlayment) plays a crucial role in how your floors look, feel, perform, and last. It’s the hidden, necessary layer that sits between your subfloor and your flooring material, and its impact is bigger than most homeowners realize.

Why Underlay Matters: The Foundation of a Great Floor

Underlay isn’t just about padding—it’s about performance. Here’s why this quiet hero deserves more attention in your flooring decision:

1. Comfort Underfoot

The right underlay transforms how your flooring feels. Whether it’s softening the feel of carpet, giving a bit of cushion to solid hardwood, or enhancing the spring of vinyl planks, underlayment adds a layer of comfort that makes every step more enjoyable—especially in high-traffic areas like hallways, kitchens, or living rooms.

2. Noise Reduction

Tired of footsteps echoing or the click-clack of shoes? Quality underlay helps absorb sound—both within the room and between floors. It’s essential for homes with kids, pets, or multi-level layouts.

3. Thermal Insulation

Underlay adds thermal insulation, helping to regulate the temperature of your floors. It keeps heat from escaping in the winter and provides a cooler surface in warmer months. For homes with radiant heating or rooms above garages or basements, this makes a big difference in year-round comfort.

4. Moisture Protection

Some flooring materials—especially laminate and engineered hardwood—can be vulnerable to moisture. The right underlay includes vapor barrier membranes or moisture-resistant materials to prevent issues like warping, mold, or mildew. In areas like basements, kitchens, or bathrooms, this is a must.

5. Durability and Longevity

Underlay absorbs everyday impacts that would otherwise wear down your flooring. It reduces stress on the boards, helps with even weight distribution, and minimizes shifting or buckling over time. The result? Your floors last longer and stay looking better.

What Type of Underlay Do You Need?

The recommended underlayment depends on the type of flooring you’re installing, the condition of your subfloor, and the specific needs of the room (moisture, acoustics, insulation, etc.).

• Carpet Underlay: Usually made of foam or rubber, it enhances softness and provides good soundproofing.
  
  
• Laminate Underlay: Rolls often include a moisture barrier and provide cushioning for noise and comfort.
  
  
• Vinyl and Luxury Vinyl Plank (LVP) Underlay: Needs to be thin, dense, and moisture-resistant—sometimes built-in, attached with the flooring.
  
  
• Hardwood Underlay: Focuses on moisture protection and minor sound dampening without adding too much give. Although providing good sound deadening, cork sheets are not a suitable underlayment material for wooden floors unless the floor is floating.
  
  

At Floors USA, we help you choose the right underlayment for your flooring type and living space—so you don’t have to guess or settle for a generic option.

Is Any Underlayment Self-Leveling for Uneven Floors?

Underlay offers a variety of benefits, but fixing your floor slope is not one of them. While some products have smoothing properties, they can only provide minor adjustments. Getting a flatter floor means more appropriate solutions like leveling compound.

How Much Does Underlayment Cost?

The cost of underlay varies depending on material, thickness, and features like built-in vapor barriers or soundproofing. While it’s tempting to cut costs here, remember that underlay is an investment in your floor’s lifespan and performance. Saving a little now could cost a lot more later in repairs or replacements.

We’ll walk you through cost comparisons in-store and help you find the best solution for your budget.

Why Floors USA?

For over 45 years, Floors USA has helped homeowners across the region make confident, informed flooring decisions. We believe every detail matters—from subfloor prep to the perfect finish.

When you shop with us, you’re not just choosing a floor—you’re choosing the full experience, backed by expert advice, professional installation, and the industry’s best brands. We make sure you know what’s underneath your floors before you fall in love with what’s on top.

Ready to explore your flooring options—from the ground up?
Visit our 40,000 sq. ft. showroom or speak with one of our flooring specialists to see, feel, and compare underlayment options firsthand.