They are poured in a continuous line in a drywall plant and cut to size after heating .
Drywall mud is the thick, goopy white stuff you use to fill the seams between boards.
Drywall is not packed on palletes. It comes as a 'lift' of 50, 60, 80 or 100. (depending on size of boards) - A lift of standard 1/2 inch 4 x 8 boards is 100 boards and weighs approximately 5,400 pounds.
You figure out the square footage, and then the size and number of boards needed.
Drywall is usually made with gypsum.
GYPSUM is the main mineral in Drywall.
Depending on doors and windows that is approximately 500 sq.ft or 16 standard boards.
A plaster of gypsum is usually used to make drywall.
I don't believe slate was ever used for interior walls. It was, and still is often used as roofing. - Forms of plaster wall coverings or drywall boards made from gyproc have been in use from about 1895.
To make plaster boards
The combination of heat dried gypsum and strong paper each side gives drywall boards their strength.
Gypsum is a mineral that is used in plaster-of-paris, wallboard, drywall, and alabaster.
Drywall is commonly calcium sulfate dihydrate, or gypsum. Nowadays there are other types, notably flue gas desulfurization (FGD) drywall and 'Lite' drywall containg ash.