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Those are called Mafia Blocks... A Jersey Barrier is what you see along the highway in construction zones.....I've built a building with cement blocks I guess they call them jersey barriers they are 2'x2'x6' used them for the walls then built a truss roof over that . The building should hold a good 100 yds. with 6-1 ratio I think I should be all right I also cover my sander when I am on the road I think it does help the freezing