In the US, there is no law requiring the casket to be placed in a vault. But many cemeteries make such request because they want to avoid the caving in of graves as a result of either the deterioration of the casket or the use of heavy machinery for maintaing the cemetery.
No, at least not in the US.
But the use of a vault can be required by cemetery regulations.
Possible, but unlikely. In most places, a casket or coffin is placed in a metal or concrete vault which is placed in the grave before the casket.
Define burial vault. If you are refering to the out container that a casket is placed into I refer you to ---- http://www.cemeteries-of-tx.com/LAWS.htm
In the US, the cemeteries usually requests the use of a vault in order to prevent the caving in of the grave (either by the deterioration of the casket or by the use of heavy machinery for maintaining the cemetery). Oftentimes the relatives buy a vault also for reasons of peace of mind because a hermetically sealt vault protects the casket (at least for some decades) from the entering of ground water or insects. But there is no law that requires the use of a vault.
The flag should be placed smoothly and gently around the casket; the stars should be at the bottom of the casket and the d trips are at the top,
The main benefit is for the cemetery: a vault prevents the grave from caving in as a result of a breakdown of the casket and / or the use of heavy cemetery maintenance machinery. In addition to that, a - hermetically sealing - vault may provide the relatives with the peace of mind that at least for some decades no groundwater and no insects can enter the casket.
A bier is a stand where a casket is placed.
A tomb is a structure that typically is above ground in which the casket is placed. A grave is a hole in the ground in which the casket is placed. A tomb stone is a structure placed above a grave to mark the location of the grave.
In the US, a burial vault is not required by law. Oftentimes it is required by cemetery regulations because a vault prevents the grave to cave in as a result of a deterioration of the casket and / or the use of heavy cemetery maintenance machinery.
A vault. Some states require one in addition to a wooden or cardboard casket to prevent erosion once the wood or other type casket starts to degrade. There are "Green cemetaries/burials where natural wood or fiber materials are used. A stone coffin from the Egyptian pyramids is called a Sarcophagus.
a vault
A (sealed / air and watertight) burial vault or an (unsealed /non-protective) grave box.
Yes. There is nothing wrong or illegal about that.