[wideminded]

Cement? I’ve lived all over in the world, in a variety of cultures, and have never heard of cement being a normal part of grave “building”.

In many, if not most jurisdictions in the United States, it is required that graves be lined with a concrete vault. This is to prevent contamination of groundwater and also prevents later collapse of the grave. I'm not sure if that is what they are talking about here.

[bill1952]

Never heard of a concrete requirement.

The casket typically goes into a metal box for that purpose.

I suppose you could use concrete.