Concrete subfloors might look dry, but they can have moisture in the concrete. This moisture can get trapped under your flooring which can lead to damage, mold, and health issues that will cost a lot to fix down the road.
A proper vapor barrier that properly protects against moisture can help prevent that from happening.
What a Vapor Barrier Actually Does:
- Blocks moisture from seeping up through the slab
- Protects flooring from swelling, warping, or delaminating
- Prevents mold and mildew from forming underneath
- Extends the life of laminate, carpet, and engineered wood
- Complies with manufacturer warranties and industry best practices
What Happens Without One?
If you skip the vapor barrier:
- Moisture can build up under your floor,
- You may notice musty smells or visible damage,
- Flooring warranties are can be voided without proper installation and protection.
Vapor Barriers Are Required for Most Concrete Installs
Laminate and carpet installation in basements or ground-level concrete slabs should Always have a strong vapor barrier. Many premium subfloor systems have this built in or allow airflow that stops moisture from getting trapped entirely.
Final Thought:
Even if your concrete seems dry, it's what you don't see that's dangerous and can cause serious problems. The right vapor barrier system is a simple step that can save your entire floor from early failure.