Aug 06, 2011· Footing size for small besser walls. I want to go 3 or 4 besser blocks high and roughly 2400 * 900 using full blocks ( and corner blocks I 'spose) but this will be a productive vegie and herb garden and will be filled with our local clay soil. Will I need to refer to the builders guide and use a proper footing dug all the way down to...