I dislike concrete but I had no option to build the foundation where the dome stands on due to time and lack of construction knowledge. Thickness of the concrete foundation is 5 cm.
Mixture ratio of making concrete I used.
Crushed stone : sand : cement = 3 (shovels) : 3 : 1.5
The steel geodesic dome
five centimeters of concrete – 5 cm
one layer of crushed stones – 2 cm to 2.5 cm
one layer of plastic – water protection
Water drain pipe installation
Wire mash installation
Putting first layer of concrete
Putting second layer of concrete