On top goes a car or truck?
Underneath the blocks is clay, sand, other?
The 2006 edition of the IRC states the following concerning floors in garages:
R309.3 Floor Surface
Garage floor surfaces shall be of approved, non-combustible material.
This is sort of an indoor residential floor construction. Residential loads are about 50 pounds/sq. ft. [PSF].
A tire that holds up 800# and has a footprint of 25 sq. in. is sort of a concentrated load @ 32 PSI which equals 4600 PSF.
Sounds like a bad idea for a garage floor.
Last edited by Wuzzat?; 02-14-2010 at 09:58 AM.