Base level lowering
lowering base plane (established under previous names use "construction material") confirmation foundation should be treated with great caution.
Unfortunately, we meet with solutions, where the descent "treat" every precaution (or geotechnical investigation) construction material is considered without the elixir.
Unfortunately, however, typically - because of the load-bearing soil much deeper location - this solution does not work, just a waste of money, was unnecessary attempt.
It has justification only, where can be carried out economically, reasonable depth ( 1-1,5m) this one is definitely better from the bottom of the page has a duty ground.
Applicable economical solution to missing teeth being fitted with the existing building foundation plane must take deeper.