|
BTW you should use 8 x 8 x 16 blocks (not 6") for stability and also you can get 4 foot radius curved blocks for the corners. Makes a much cleaner and stronger structure.
As for the soil stability, every dig is different. We dug a 5' deep hole with sides at less than 10 degrees for the top 3 feet, and it has been stable for more than 6 months (don't ask!). They built cathedrals 1000 years ago mostly by trial and error too...
Tom
|