The first task is actually drilling the hole for the stainless steel rods which you can see being done in Photo #1 and Photo #2. This crew has to wear a fairly substantial mask due to the dust.
While the crew is working on the top of the roof, another crew member drills two small holes, one about 2/3 way down the wall and another about 3 feet from the bottom of the wall (see photo #3).
These two holes are used to relieve pressure as the drill comes down creating the hole. The dirt and dust that is created in the drilling process needs to be allowed to escape and these holes allow that to happen. The end result of the dirt/dust blasting out of the hole is remarkable. Not only does quite a bit blast out of the hole, but it comes out fast (see Photo #4).
Once the hole is complete it is vacuumed out and the stainless steel rod is inserted and later epoxied. The east and west wall are almost complete. The last photo is the west wall with the rods in place.-JK