Hi, can some one please run me through the build-ability of the padstone foundations(footing F01- green hatch). Obviously the existing rear wall of the house is their at the moment and we are wanting to build and make the extension watertight before knocking the rear walls down and installing the steel.
Its the right hand side pad that I'm concerned about as i believe this will have to be done when the extension foundations are poured. can they do this from the outside(underpin) or can it be poured in two stages?, our kitchen is the room that this backs onto and we don't want to rip it out just yet.
The SE has stated " 1000x1000x300dp rc35 pad foundation with 2 No. A393 in bottom", the opening is 6.5m so quite large, im not sure if a box frame might be better design for us.
Thanks in advance.