12 Mil HSU™ High Strength Utility Compare this product to the Viper(tm) brand barrier.Our HSU is: better priced thicker (12Mil) shorter delivery time This 12 Mil vapor barrier is an excellent vapor barrier for crawl space encapsulation. It is made by laminating three layers together; The HSU does not use polyester threads to reinforce the plastic, but instead gets it’s reinforcement from...