|
Derek, I also have clay under the topsoil. My base is 900 deep by 800 square on top. I simply got sick of digging it and that is where it stopped. I put about 100mm of gravel in the bottom and used about 12 bags of premixed to fill it. You should put some gravel in the bottom if it's clay to give the water some where to go before it goes up and lifts the footing.
It's been in for well over a year and I only just had to level the bolts on the head of the pier this month after building a dome on top of it.
Last edited by Tandum; 06-02-2011 at 03:05 AM.
|