Browse Forums Building A New House 1 Mar 23, 2017 11:27 am Hello friends, I've done some searching and can't seem to find a clear answer so here goes. It looks like we're going to need to upgrade to a Class P slab for our build which is a Carlisle Homes single story 35dq home. My question is who has had to go to a Class P slab and typically, what was the additional cost to do so? Thanks, Chris. Re: Upgrading to Class P Waffle Slab 2Mar 23, 2017 11:42 am P is usually the site classification (problematic) Our build thread viewtopic.php?f=31&t=82369&p=1525857&hilit=fairhaven#p1525857 Re: Upgrading to Class P Waffle Slab 3Mar 23, 2017 12:09 pm We went from. A h1 to a p. It was an extra 4500. Because we needed to increase the number of piers. Re: Upgrading to Class P Waffle Slab 6Mar 23, 2017 7:58 pm My Slab has just come back as class P but I have fixed site costs so I'm not sure of costs. 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 7892 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 8260 I don’t think so as the floor area over 300 square meters then it is class 3…. 12 15880 |