ICF and Insulated raft junction at Ground Level (NO DPC gap)

[Renegade105]

Hi,

 

for our KORE insulated raft, the main house is 150mm above external ground level so no problem there, BUT for our garage, the internal floor level is level with the external so a car can drive in.

 

I can’t change this as it’s now designed this way…at the entrance of the garage we will have a ACO linear drain, but what do I do with the rest of the perimeter wall if the garage? 
 

ideally would like to avoid more ACO drains as I have a 450mm silt trap in the soak away and I’m worried how filled up it will get already.

 

can I dig a small trench around the garage and have a small step? I can brace the sides of the driveway anyway with steel pegs and some decking/sleeper/etc etc.

 

your ideas are much appreciated.