Why Some SPC Flooring Fails: Understanding Composition, Subfloor Preparation, and Moisture Control

 


SPC (Stone Polymer Composite) flooring is a popular choice for homeowners due to its durability, waterproof properties, and stylish appearance. However, not all SPC flooring performs the same. Failures often occur due to low-quality materials, improper subfloor preparation, and moisture issues. This article explores the common reasons SPC flooring can fail and how to avoid costly mistakes.

1. The Impact of Limestone Content in SPC Flooring

SPC flooring consists of a core made from a blend of limestone (calcium carbonate), PVC (polyvinyl chloride), and stabilizers. While limestone adds strength, excessive limestone with too little PVC can make the core brittle and prone to moisture absorption.

  • A higher limestone ratio makes SPC planks more fragile, leading to cracks and breakage over time.

  • A porous core absorbs moisture, which can cause warping, swelling, and structural weakness.

  • Premium SPC flooring maintains the right balance between PVC and limestone, ensuring long-term performance and durability.

When selecting SPC flooring, homeowners should check product composition and avoid budget-friendly options that use excessive limestone, compromising quality.

2. The Necessity of a Vapor Barrier on the Subfloor

Even though SPC flooring itself is 100% waterproof, moisture from below—especially from concrete subfloors—can still create problems if not properly managed.

Why a Vapor Barrier is Crucial:

  • Concrete naturally retains and releases moisture. Without a vapor barrier, water can seep into the SPC planks, leading to warping and potential mold growth.

  • High humidity can result in click-lock failures as planks expand and shift.

  • A vapor barrier acts as a protective layer, preventing moisture from damaging the flooring.

How to Ensure Proper Moisture Protection:

  • Test the subfloor for moisture levels before installing SPC flooring.

  • Install a 6-mil plastic vapor barrier over concrete to stop moisture transmission.

  • Seal cracks and gaps in the subfloor to prevent hidden moisture buildup.

3. The Importance of a Level Subfloor

Since SPC flooring is rigid, it does not flex to accommodate an uneven subfloor. Subfloor irregularities are a leading cause of SPC flooring failures.

Issues Caused by an Uneven Subfloor:

  • Gapping & Lifting: An uneven base prevents planks from locking together properly, causing gaps or lifted edges.

  • Click-Lock Damage: If the locking mechanisms are forced over uneven areas, they can break, leading to loose or misaligned planks.

  • Noisy Flooring: Hollow spots under planks create popping or creaking sounds when walked on.

How to Properly Prepare the Subfloor:

  • Ensure the subfloor is level within 3/16” over a 10-foot span.

  • Use a self-leveling compound to correct dips and low spots in concrete subfloors.

  • For wood subfloors, sand down high areas and fill in low spots before installing SPC flooring.

  • Always refer to the manufacturer’s recommendations for proper subfloor preparation.

Final Thoughts: Avoiding Common SPC Flooring Failures

While SPC flooring offers exceptional benefits, poor-quality materials, moisture issues, and improper subfloor preparation can lead to premature failure. Here’s how to ensure a successful installation:

✔ Choose high-quality SPC flooring with a well-balanced composition of PVC and limestone.

 ✔ Install a vapor barrier over concrete to prevent moisture-related damage. 

✔ Make sure the subfloor is completely level before laying down the flooring. 

✔ Follow manufacturer guidelines for installation and long-term care.

For those looking for premium SPC flooring, LVTflooringStore.com offers a wide selection of high-quality vinyl flooring options. Customers can even order samples before committing to a purchase, ensuring they choose the perfect flooring for their home.

By following these best practices and selecting reliable products, homeowners can enjoy durable and visually appealing SPC flooring without common installation pitfalls.

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