ArizonaShooting.ORG

The only difference in the concrete used in reactors and a house is the PSI.
Most construction is done with 2500-5000 PSI.
Reactors are 6000+ PSI.
The reason they use higher PSI in reactors is because of the domed top.

I have built several buildings with those styrofoam blocks.
It's a great way to go and at the time , only cost 10% more than it would have with stick frame and stucco.

i saw a guy remove the sheetrock in his walk in closet and put up expanded metal- then replace the sheetrock- reinfoced the door. added a safe door he bought used-
it might not stop everyone but damn-