Dec 13, 2022 · A 10 mil film is thicker than a 3 mil film and so on. Polyethylene sheeting (film) has a big role in offering plastic protection. It is used in nstruction as vapor retarders, window fil, flooring and unter top protection, and even in roofing. Polyethylene sheet can be used to seal off roo, ver building materials, and be used in lead