In case your crawl space has started to develop mold and mildew, it is important to install a 12 mil plastic vapor barrier so that the wood on the floor doesn’t get damaged. USA crawl space offers12 mil crawl space white/black vapor barrier is designed to meet high demanding applications requiring a higher tear resistance. However, for applications that demand heavy-duty products, the 12 mil vapor barrier may not be a suitable option. In such a scenario, check out our 20 mil product that is specifically designed to cater to applications with heavy-duty requirements. You should also check the local building department before starting with the installation process. Since every building is likely to have specific codes, it is important to conduct proper research to find the right codes relevant to your job site’s area.