On Tuesday, June 21, 2005, at 03:45 PM, Greg Newell wrote: > Jeff, > By concrete blocks I hope your not referring to cinder blocks. > They can and do crumble you know. I'd much rather use wood. stronger > by far!!!! > > best, > Greg > > Not sure if it is the same or not. I've heard them called both names but don't know if that's correct or urban myth. These are used for laying the foundation of houses, supporting mobile homes, etc. They are used in the construction of schools, and many public buildings. I've even seen houses built entirely out of them. Same thing? They can certainly crack if turned the incorrect way. But I've never seen or heard of one cracking when used correctly. Very strong. Certainly strong enough to support a piano if it can support a house. But you are right, if used incorrectly they can shatter. You have to put a 4x4 scrap block on top of the concrete block, so that it is not a metal on concrete, but also because the block by itself is not high enough, and you can't really set a jack on a concrete block without also using a piece of wood. Jeff
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