Our Vault family is made with patented Surestone Technology, which provides the industry’s best strength-to-weight ratio and has virtually no thermal expansion or contraction. It's powerful, stable and doesn't absorb moisture. The mineral-based composite technology inside Deckorators® Vault allows the decking to be lightweight, but creates a fiber-like structure inside, similar to wood, giving it unmatched strength. The lightweight boards are easy-to-handle on the job site and have similar properties to PVC; however, unlike PVC and other composites, Vault won't splinter, sag, chalk or crack.