The Truth About Rigid Core Vinyl Flooring: Why Thickness Matters More Than You Think

The Truth About Rigid Core Vinyl Flooring: Why Thickness Matters More Than You Think

When shopping for rigid core vinyl flooring, most homeowners focus on looks—but thickness and construction are just as important for durability, stability, and performance. However, not all flooring thicknesses are created equal. Some manufacturers use misleading advertising by including the underlayment in the total thickness, making their product appear more robust than it really is. Here’s what you need to know to make an informed choice when buying rigid core vinyl flooring.

1. Why Overall Thickness Isn't the Whole Story

Many manufacturers advertise their flooring as 5mm thick, but if you check the details, you may find:

• Core Thickness = 3.5mm
• Padding (Underlayment) = 1.5mm
• Total Advertised Thickness = 5mm

While a thicker plank may sound good, the core thickness is what truly determines the durability and stability of your flooring. If the core is too thin, the locking mechanism is weaker, and the floor may be more prone to gapping, separating, or breaking under pressure.

✅ Always check the core thickness separately from the total thickness!

2. Why Core Thickness Matters More Than Total Thickness

A strong core is the foundation of a high-quality rigid vinyl floor. Here’s why core thickness is more important than just the overall measurement: ✔ Stronger Locking System – A thicker core (5mm+) provides a more durable click-lock mechanism, reducing the risk of failure over time. ✔ Better Stability – A thin core (under 4.5mm) is more prone to flexing, leading to gaps, separations, or broken locking tabs. ✔ Less Subfloor Imperfections Showing – A thicker core hides minor subfloor imperfections better, providing a more even surface. ✔ Improved Sound Absorption & Comfort – A thicker core absorbs more noise and feels more solid underfoot.

3. The Risk of Thin Flooring (Under 5mm Core)

🚨 If the core is too thin, you may experience:

• Weakened locking mechanisms that can break with movement or uneven subfloors.
• More flexing under heavy furniture or foot traffic.
• Higher risk of gapping and shifting over time.
• Difficulty with installation, especially for floating floors.

If you’re installing on an uneven subfloor, a thicker plank (5mm+ core thickness) will perform better and last longer.

4. How to Avoid Being Misled by Advertised Thickness

✅ Always check product specifications – Look for core thickness separately from total thickness. ✅ Ask the retailer or manufacturer – Confirm that the core is at least 5mm thick before purchasing. ✅ Choose a reputable brand – Trusted brands provide transparent specs without misleading marketing.

Final Thoughts: Choose Flooring That Lasts

When investing in rigid core vinyl flooring, don’t fall for marketing tricks that inflate total thickness with padding. Instead, focus on core thickness to ensure your floor is stable, durable, and built to last.