MgO sheathing is made as individual
pieces that are sliced to length as they are poured onto a throwing plate. The
underlying set happens on a level plane; however, the last fix happens
vertically or with spacers between the sheets.
The MgO is thrown in a fluid slurry-like
structure and sets up by compound response - much like Portland concrete does
in plaster or cement. The cast sheets are then restored at encompassing
temperature. MgO sheating...
