Does SPC Flooring Needs Vapor Barrier？

SPC flooring typically does not require a separate vapor barrier underneath it, especially in residential applications. 

Here are the reasons why:

Installation Method: 

SPC flooring is often installed as a floating floor, meaning it is not glued or nailed down to the subfloor. 

Instead, it relies on a click-lock or glueless installation system. 

This method allows for air circulation underneath the flooring, which helps manage any minor moisture that might be present.

Subfloor Requirements: 

SPC flooring can typically be installed over most existing subfloors, including concrete, plywood, and existing flooring like vinyl or tile, as long as they are flat, dry, and free of debris.

Waterproof Properties: 

SPC flooring itself is inherently waterproof due to its dense core made of limestone powder and PVC. 

This core does not absorb moisture, making it resistant to water damage from below.

Moisture Control: 

While SPC flooring is waterproof, it's important to ensure that the subfloor is adequately dry before installation. 

Any excessive moisture in the subfloor should be addressed beforehand to prevent issues like mold or mildew growth.

In summary, for most residential applications, SPC flooring does not require a separate vapor barrier underlayment. 

Always follow manufacturer guidelines and recommendations for installation to ensure the best results for your specific environment.