Hi
Just a quick question, how important is it to have 300mm of compacted subgrade as a capping layer above a soakaway which is to sit under a driveway?
Could I get away with less? Say 150mm capping layer and then a further 150mm as planned across the whole drive. Rather than 300mm then 150mm?
I may have dug the hole out a little shallow...
Capping layers above soakaway
-
Tony McC
- Site Admin
- Posts: 8346
- Joined: Mon Jul 05, 2004 7:27 pm
- Location: Warrington, People's Republic of South Lancashire
- Contact:
Compacted sub-grade??? Do you mean compacted sub-BASE?
It's important to have what is, effectively, a load-spreading 'bridge' over a soakaway so that there is no point load applied to the structure. Whether 300mm is necessary is debatable, but it's a reasonable 'average' figure. You might get away with, say, 150mm, and HD applications could well need 600mm, but I really wouldn't skimp on it unless I absolutely had no other choice.
It's important to have what is, effectively, a load-spreading 'bridge' over a soakaway so that there is no point load applied to the structure. Whether 300mm is necessary is debatable, but it's a reasonable 'average' figure. You might get away with, say, 150mm, and HD applications could well need 600mm, but I really wouldn't skimp on it unless I absolutely had no other choice.
Site Agent - Pavingexpert
-
lutonlagerlout
- Site Admin
- Posts: 15182
- Joined: Fri Aug 04, 2006 12:20 am
- Location: bedfordshire