Garden Workshop Base

Joined
2 Dec 2015
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United Kingdom
Evening,
I'm about to lay a concrete foundation for the above and wanted to run things past people who know more than me...
My methodology is:
  • Shutter the area with timber and stakes.
  • Tramp soil down (its quite compact and I think clay).
  • Lay thin layer of builders sand.
  • Lay DPM (and upsides of shutters)
  • Lay thin layer of builders sand.
  • Lay 4-5'' layer of concrete (5:1).
  • I was going to then lay a course of bricks on top which to secure my shed frame (on top of DPM between brick and stud wall).
Seems reasonable (to me!) but do I need rubble under the first layer?
 
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