Moisture management is essential for LVP. Concrete subfloors naturally release moisture, which can cause mold, mildew, or damage to the underside of the planks. A 6-mil polyethylene plastic sheet acts as an effective vapor barrier. However, check your specific LVP product's installation guide; some modern planks come with an integrated underlayment that may already provide moisture protection. Always verify the manufacturer's specific moisture testing requirements and warranty guidelines before installing any underlayment.
Ask an ExpertLuxury Vinyl
Do I need a vapor barrier under luxury vinyl?
A vapor barrier is generally required when installing luxury vinyl over concrete subfloors to prevent moisture migration. It is not usually required for wood subfloors, unless the manufacturer instructions specifically mandate it for your product type.