The term "waterproof" has made Luxury Vinyl Plank (LVP) the go-to flooring for homeowners in Hernando, MS, and across the humid Mid-South. It sounds like a guarantee of invincibility, especially in moisture-prone areas like kitchens, bathrooms, and basements.
While LVP is truly a revolutionary product, relying solely on the word "waterproof" without understanding the material science and the installation caveat can lead to costly flooring failures.
At DeSoto Floor Covering & Interiors, we want our Hernando clients to have a floor that is genuinely protected. We look beyond the surface to ensure your subfloor—the silent foundation of your home—is safe and secure.
Why the Plank is Waterproof
Modern LVP earns its "waterproof" title not from its top layer, but from its revolutionary rigid core. Understanding the core is key to understanding the product's performance.
WPC vs. SPC Cores
Today's most popular LVP categories are built with one of two dense, non-organic cores:
WPC (Wood Plastic Composite): This core is made by blending wood pulp or flour with plasticizers and a foaming agent. The composite material and the foaming process make the core lightweight, softer underfoot, and 100% waterproof.
SPC (Stone Plastic Composite): This core utilizes a higher ratio of natural limestone powder and stabilizers. This results in an ultra-dense, rigid, and virtually indestructible core that is completely impervious to water and highly resistant to indentations.
The Shared Result: Because these core materials contain no organic wood that can swell or warp when exposed to water, the plank itself will not be damaged, swell, or peel due to topical moisture. This is the definition of LVP's waterproof claim.
Waterproof vs. Watertight
This is the most critical distinction homeowners must understand: a waterproof plank does not mean a watertight installation.
Most LVP is installed as a floating floor using a click-and-lock system.
The Problem: The planks are designed to lock together tightly, but these joints are not fused or sealed like the grout in a ceramic tile floor.
The Risk: If you have a significant spill (e.g., an overflowing washing machine, a major pet accident, or a leaking appliance) that sits on the floor for hours, water can pool and eventually seep through the microscopic seams and joints.
The Danger to the Subfloor: Once water gets beneath the LVP, it is trapped between the LVP backing and the subfloor (concrete or plywood). The moisture is now locked in, creating a perfect environment for mold, mildew, and microbial growth on the subfloor. This serious issue compromises indoor air quality and can lead to foul odors.
Even though the LVP plank itself survives the flood, the consequences for the subfloor and the installation are severe, often necessitating the removal of the flooring to dry out and treat the subfloor.
Protecting the Foundation
The best defense against subfloor moisture is proactive testing before installation, particularly in Hernando, where humidity levels are consistently high, and many homes are built on concrete slabs.
Why We Test the Subfloor
A concrete slab naturally wicks moisture vapor from the ground upward (vapor drive). Plywood subfloors can also retain excess moisture, especially if they are new or exposed to humidity during construction.
Installing LVP—which acts as a barrier—over a damp subfloor traps that moisture, guaranteeing failure.
Manufacturer Requirements: Every major LVP manufacturer requires the installer to measure the moisture content of the subfloor and adhere to strict relative humidity (RH) or moisture vapor emission rate (MVER) limits.
The Process: At DeSoto Floor Covering & Interiors, we use professional-grade moisture meters to check the subfloor. For concrete, we may utilize specialized probes (ASTM F2170) to measure the internal Relative Humidity of the slab.
What If the Test Fails?
If the moisture readings are too high, we do not proceed with the installation until the problem is mitigated. Solutions include:
Applying a Liquid Moisture Barrier: A professional-grade roll-on or trowel-applied moisture mitigation coating is applied directly to the concrete slab, sealing it to prevent vapor drive.
Using a Polyethylene Vapor Barrier: For floating installations over concrete, a sealed plastic sheeting (usually 6-mil poly) is installed to block the vapor.
This professional diligence ensures that the waterproof LVP is installed on a dry, stable subfloor, guaranteeing a clean, long-lasting installation that protects your home's air quality and structural integrity.
Don't let the word "waterproof" give you a false sense of security. While LVP is the best defense against topical spills, true peace of mind comes from a professional installation that protects your subfloor from internal moisture and external leaks.
At DeSoto Floor Covering & Interiors, our expertise goes deep. We follow every manufacturer's specification and industry standard, ensuring your beautiful LVP floor is installed correctly for a lifetime in Hernando.
Ready for beautiful, truly protected floors in your Hernando home? Contact DeSoto Floor Covering & Interiors today to schedule your Free Estimate, which includes a professional subfloor moisture assessment!
Schedule now to secure your consultation and guarantee a long-lasting, worry-free installation!
