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
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Tony McC
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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.
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lutonlagerlout
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