I am in the process of completing an extension next to an existing building. The new extension was built 80cm from the existing building due to digger access. I now need to fill in this gap.
Background: Extension approx 8x7m, slope site, finishing foundation walls and preparing for fill then Concrete slab pour. The new structure is a reclaimed wood beam house. The extension has concreate footer 50x35cm and CMU blocks filled with cement. The old structure is concrete trench pour. Location south Poland, winter -30c. The 80cm gap between buildings will not be a supporting wall.
Option 1: Digg down below the frost line, put up shuttering and fill with cement to the desired level.
Option 2: As above, but drill and epoxy in some horizontal rebar into both foundations.
As this gap is so small, I'm guessing Option 2 may be best as this wall with the rebar could even float above the ground, maybe I do not need to dig below frost line? If that is the case maybe best to rebar into the new foundation only.
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