Browse Forums Building A New House Re: P Class Slab Cost 3Mar 22, 2016 4:35 pm rksharma Hi All, I am building in Melbourne west. Our builders did a soil test and engineering and found lot have a fill and classified as P site. Engg. suggested to put piers, Our builders gave us a price of $11000 for 30 Piers with 450 mm diameter 1800 mm depth. Also additional N12 bar between these pillars in H2 waffle pod slab. I am concerned if the cost builder gave us is is right and not or usually how much it cost to put in piers. All suggestion appreciated. Thanks Is it in a new development? If you can get a compaction certificate from the developer it might raise the soil classification up. Based on the soil test they have to assume the soil was just dumped, leveled and ready to build on. If you can show it was compacted as per Australian standards then they can work it up in classification. Ours went from a P class to a H1 and saved us a few thousand based on that alone. If it isn't a new development and is land that's been built on before then you're out of a luck and stuck with the additional costs. See here for more info: http://www.build.com.au/building-reactive-soil-sites 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 9856 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 13100 I don’t think so as the floor area over 300 square meters then it is class 3…. 12 17936 |