Strata 15 PSI Block Stopping
The stoppings consist of two concrete block walls built across the mine entry and the edges sealed with Packsetter Grout bags. A blast-proof steel access door is placed and sealed into the wall.
Gunite or shotcrete can be spray applied on the surface of the outby side to secure against air leakage. Heights up to, and including, 8 feet have a set width of 15.25 inches. Heights greater than 8 feet, up to and including 11.5 feet, have a width of 22.875 inches.