Choosing SPC Flooring (Part 4): The Role and Selection of Underlay

When choosing SPC flooring (Stone Plastic Composite), its wear resistance and waterproof performance are often the main reasons homeowners are drawn to it. However, one critical factor that should never be overlooked is the underlay. The choice of underlay has a direct impact on the floor’s performance, comfort, and lifespan.

The underlay is the bottom layer placed beneath SPC flooring. Common underlay materials include IXPE, cork, and PU+PET, with most products on the market typically offering thicknesses of 1.0mm or 1.5mm. In this article, we take a closer look at SPC flooring underlays and compare the most common types available.

Why Is Underlay Important?

During installation, the underlay sits between the SPC flooring and the subfloor, serving several essential functions:

Sound Insulation and Noise Reduction

Underlay helps reduce noise caused by walking or moving furniture and prevents sound from travelling between floors.

Improved Walking Comfort

Both the subfloor and SPC flooring are relatively hard surfaces. A softer underlay absorbs vibration, increases flexibility, and provides a more comfortable underfoot experience.

Prevents Direct Friction

The underlay acts as a buffer between the SPC flooring and the subfloor, preventing direct contact and friction that could lead to damage over time.

Floor Protection

Underlay helps distribute pressure evenly across the floor and, most importantly, protects the locking system. Professional PU+PET underlays, in particular, are designed to better protect the click-lock joints and reduce the risk of breakage.

Moisture Protection

Underlay also provides a moisture barrier, preventing dampness from the subfloor from penetrating the flooring. Although SPC flooring itself is highly water-resistant, this added layer of protection further enhances durability.

Common Types of SPC Flooring Underlay

IXPE:

IXPE is a widely used plastic underlay material known for its good sound absorption and moisture resistance. Many SPC flooring products come with pre-attached IXPE underlay, making installation quicker and more convenient.

Cork:

Cork is a natural, eco-friendly material with excellent sound insulation and thermal properties. Some SPC flooring products feature built-in cork underlay, offering improved comfort and environmental benefits.

PU+PET:

PU+PET is a more professional-grade underlay. Its stronger structure and increased thickness provide superior protection for SPC flooring’s locking system, significantly reducing the risk of joint damage and extending the floor’s lifespan.

Final Thoughts

Choosing the right underlay can significantly enhance the performance, comfort, and longevity of SPC flooring. When selecting your flooring, don’t focus only on surface features—make sure the underlay is equally well considered.

Recommended Quality Option

If you’re interested in premium SPC flooring, we recommend Arbiton HD Mineral Core® Floor, a Polish brand exclusively distributed by Equal. These floors are manufactured in Europe and come with clear origin documentation and certified product testing.

You’re welcome to visit the Equal showroom to explore Arbiton SPC flooring in person, or visit online to learn more about the product range.