QUOTE(ah_yee @ Jun 6 2013, 06:58 PM)
Kevin86, I m a civil engineer.
Your back extension actually is not safe. If your rubber wall collapse, ur whole structure is failure as well. The correct practice is to excavate until the back line level and your footing sitting on that level.
If for own use, better add few more thousand to do a correct n better sub-structure n superstructure.
All other houses doing the same practice because the owners are layman and they rely on "O Ba" contractor and never get consulted by a practised engineer.
Good luck to u.
woah , sound serious, BTW ah yee, i updated some photo, do this mean they "excavate until the back line level and your footing sitting on that level.?"
not quite understand the correct practice u mean, may be need to consult u , haha
if im not wrong , u will put in there y12 bar into the back line level, build new footing also