TF-DC = definition
TF-DC = means Top or Footing –Deep Fill Certificate and is the TF-BC plus 1.20 metres (4 feet). A lot requiring a TF-DC will require special engineering of the foundation. Possible engineering solutions are extra depth footings and piles and should always include a detailed examination of the original ground contours and the proposed foundation as in many cases the proposed building does not occupy the full building envelope and in the case of walkout lots the footing under the walkout portion is deeper than the LTF