0
1,348.85 pounds per square inch.
Gypsum or plaster board3
3/8 inch 1.56 pounds per square foot
1/2 inch 2.08 pounds per square foot
5/8 inch 2.60 pounds per square foot
1 pound-force per square inch equals 6.89476 kilopascals
From the NASA link, below:
"Earth's atmosphere is pressing against each square inch of you with a force of 1 kilogram per square centimeter (14.7 pounds per square inch)."
Kilograms per square meter x 0.001422 equals pounds per square inch.