I think you really should have an 8" slab under that. Are you sure the load is spread evenly, and not on small leveling pads?
__________________
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |