Crawl Space Repair - Unsealed Vapor Barrier

At new construction, a 6 mil vapor barrier is required to cover the ground. However it is not required to have the seams sealed or be sealed to the wall or piers. This means the liner can easily be displaced, ripped and torn by service persons and critters. Since it is unsealed and easily damaged, the 6 mil allows moisture and vapor into the crawl space instead of keeping it out.