Vapor Barrier Replacement & Installation

A crawl space vapor barrier is a sheet of material, usually made of polyethylene plastic, that is installed on the ground and sometimes the walls of a crawl space to prevent moisture from entering. 

A vapor barrier helps control moisture levels, preventing mold and mildew growth, improving indoor air quality, enhancing energy efficiency, and protecting your home’s structural integrity. 

Installation typically involves laying the plastic sheeting over the ground, overlapping seams, and securing edges with tape or adhesive. In some cases, it may also be applied to the walls. 

A vapor barrier is usually at least 6 mils thick, but thicker options (10-20 mils) are available for increased durability and moisture protection. 

While some homeowners choose to DIY, professional installation is recommended for optimal effectiveness, especially in ensuring proper sealing and coverage. 

A well-installed vapor barrier can last for many years, but it should be regularly inspected for tears or damage to ensure continued effectiveness. 

While a vapor barrier significantly reduces moisture levels, it may not eliminate all moisture. Proper drainage and ventilation are also important for managing crawl space humidity.  

Yes, by controlling moisture levels, a vapor barrier can improve energy efficiency, reducing the workload on heating and cooling systems and lowering energy bills.