The construction of each room is done under quality-controlled conditions insuring each room is up to the standards of the test model. Safe rooms built on-site are subject to the crew that happens to be on the job site that day and whether they are in a hurry to finish the job or are just interested in picking up their check at the end of the day. The doorframe is placed into the steel mold before the concrete is poured so that it becomes embedded into the concrete wall to insure against being pulled out of the wall by cyclic winds and uplift. Other people use concrete that is only 2500 psi. Our concrete is three times stronger.
Safe rooms built on-site have mortar joints where the block comes together.
Each joint is a weak point. Even if you pour the wall, you will have a joint at the seams and the steel cannot be continuous. The door itself on our safe room has been specially designed to withstand impact and wind. The door withstood the tests of past 438 mph along with the wall structure. This door is built exclusively for our company by a manufacturer of prison doors.