Browse Forums Building A New House Re: How much it costs for changing the slab class from H1 to 5Oct 01, 2014 12:07 pm The cost difference between the two types can vary significantly depending on what the engineering has stated. I would suggest looking closely at the engineering and soil test to see what has been detailed. I am not sure whether Perth has its own way of doing things in regards to this. Most of Perth has class A (sandy soil), except for some areas near rivers or hills. 2 13098 The Soil classification has little to do with piers. The purpose of the classing of the soil is to identify the clay content and the "average expected range of movement… 2 9854 I don’t think so as the floor area over 300 square meters then it is class 3…. 12 17936 |