Most metal burial vaults rely on a gasket or adhesive bond at the dome-to-base joint to keep moisture out. An air seal burial vault uses a different principle. The dome traps a pocket of air inside the enclosure, and that air pocket resists groundwater mechanically by pushing outward against rising water pressure. CMV Fabrication manufactures air seal burial vaults in steel and reinforced alloy, with every unit water-tested at the facility before it ships.
The concept is similar to an inverted diving bell. When the dome seats over the base, the air inside has no way to escape. As the water table rises around the vault exterior, the trapped air exerts outward pressure that prevents water from entering through the joint. The seal is passive and mechanical. It does not rely on a chemical compound that can break down over time, and it does not weaken as the vault ages underground.
CMV Fabrication combines air seal geometry with continuous welded seams and powder coat surface treatment to create a layered protection system. The air seal handles hydrostatic pressure at the joint. The welded seams eliminate pinhole moisture pathways through the vault walls. The powder coat finish resists corrosion from direct soil contact. Each vault is submerged in water at the factory to verify the seal before the unit is cleared for delivery.
CMV Fabrication supplies air seal burial vaults to funeral homes, cemeteries, and families who want verified moisture protection for the casket. Vault specifications including steel gauge, alloy type, exterior finish, and sizing are confirmed with the buyer before fabrication begins. Funeral professionals can contact CMV Fabrication to discuss standard configurations or to order a vault built to custom specifications.
