If you choose burial after the cremation, it's important to understand why you need an urn vault and that they do not all provide the same protection. There are several factors that challenge the integrity of an urn vault. Heavy equipment necessary for maintaining the cemetery grounds passes over the urn vault during cemetery operations. Ground water, too, is an important factor; A lined urn vault is constructed using high strength concrete. Lined urn vaults are reinforced in one of two ways: with durable plastic or with a combination of durable plastic and metal. Each lined urn vault provides the long-lasting protection needed to resist these elements over time. In most areas of the country, state or local law does not require that you buy a container to surround the urn in the grave. However, many cemeteries require that you have such a container so that the grave will not sink in. Either a grave liner or an urn vault will satisfy these requirements.
 

Basic Urn Vaults - Single Reinforced Vaults - Double Reinforced Vaults