How deep should a hole for a CONCRETE IN POST SUPPORT be? Should it be the same depth for if the post was going directly into the hole? For reference my post is 1.8m, 100x100mm, using this post support:
Galvanised Concrete In "U" Shape Post Support Heavy Duty For 100mm / 4 Inch Posts https://www.amazon.co.uk/dp/B01LZSW9NZ/ ... UTF8&psc=1