Levelling soil for sub-base

[jonsho]

Hi all,

Quick question. I'm building a gravel drive out front. I'm in the process of skimming the topsoil away until I reach a decent firm base.

I'll be honest, it's hard work... I've got enough material away for 150-200mm sub base with 50mm depth gravel on top...

The "levelled" layer has some mild undulations that I just can't be bothered to dig out. At the peak they're low enough to take the full depth of sub base. Cost aside, can I just lay the membrane on this slightly wobbly surface, then rely on a good few layers of wackered mot1 to even it out fully?

So long as the sub base is level I can't see it being an issue, as long as it is deep enough itself?

Cheers

 

[blup]

It doesn't have to be perfectly flat, but if excessive there is a risk of variations in the settlement.

Blup

 

[jonsho]

Perfect, thanks for the reply.

Looks like rain has put a halt to anything for a while now though... missus is gonna kill me with the mud getting tracked around...

 

[23vc]

Do you need the membrane? Wouldn’t it get ruined when you whacker the hardcore? Or is it one of those geotextile things?

 

[jonsho]

Would be geotextile yeah. Need to redo the haunching around the block paving so hoping to get it right up to the edges, never going to 100% dodge the weeds but I'll give it a good go haha.