The problem

         
        A floor in a warehouse sag 20 cm                     The result after work...

1. The sagging floor by a demolition company let it break out and pour a new floor.
Not an ideal solution, not only the whole space has to be cleared or are degraded, but also the floor can be a considerable amount of time can not be used. Also, will this new floor without piles sag again.

2. A new concrete floor over the old landfill there.
Again, this is not a solution. The floor will sag again in a significantly accelerated pace. The floor is indeed even heavier if a new concrete layer is deposited. For asphalt floors, asphalt roads and the same principle applies.