In Alberta, earth burial (interment) is traditionally the most commonly used method of final disposition. The burial must take place in a cemetery that is registered with the Alberta government. Most cemeteries will require an outer box made of concrete or wood that the casket will be lowered into. Also available are burial vaults which are water-tight and air-tight to prevent outside elements from entering.
Most cemeteries require at minimum a concrete outer box (liner) to help fulfill the requirements of maintenance and perpetual care. The concrete box controls a majority of the future settling of the grave. Also, since graves are no longer dug by hand, the concrete will protect existing buried remains from disturbance from machinery when nearby graves are being dug.