Folks, can someone please, please help me. I'm designing a small, two story, house in BangSaray, about 7 km from the sea. What type of foundation do I need?. I intend to use lightweight roofing such as Onduline and 200mm QCon for the walls. I've been told everything from 8 metre deep pilings for every 3 metres of wall to a single 500mm concrete slab to 1m deep foundation walls. So effing confused.