Joined: July 2004
||Posted: 06 Jan. 2020,11:06
15-20mm is NOT, abso-bloody-lutely NOT a sub-base. The max particle size for sub-base aggregate is 37.5mm, so how do you get just 15-20mm of that?
Unless you've misunderstood the dimensions and what you were told was actually 15-20 cm (centimetres) of sub-base, I would be marching this "builder" straight back to the livery stable to collect his horse and send him packing straight back to Dodge City!
The very minimum depth fora patio sub-base is 75mm and I'd much rather see 100mm, as would most, if not all *professional* paving installers. Whatever some jack-of-no-trade builder tells you, 75mm is the rock bottom, to pick an apposite phrase, and for these reasons....
You can choose whether to heed the nonsense spouted by some eejit "builder" or some no-skill pillock behind a counter in a DIY store, or maybe follow the advice provided by someone with over 509 years experience of paving and pavement construction.
Site Agent - Pavingexpert