This job was brought to us by a fellow contractor who wanted us to build the outer shell of this addition. Once it was up and weather-tight, he would complete the interior renovations. "Before" picture of original sunroom and deck during the initial stages of demolition.
The original house didn't have a full basement, but the new addition would. This required us to excavate below the foundation of the main house.
Set up of forms for poured basement walls
Underpinning forms - since we excavated below the foundation of the existing house, we now needed to support it. This was done by pouring a concrete wall in small sections underneath the existing foundation; each section is tied together with rebar to make the finished wall a solid unit.
Basement floor going in; the finished underpinning wall is on the left.