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I've never heard of putting AstroTurf onto a concrete base.
It's normally type 1 sub base whacker plated down until level, then grano dust on top that gets brushed then whacked and swept then whacked again until it's billiard table smooth.
Bobbo-
Yeah if starting from dirt, but fucked if I'm smashing up and carrying out more concrete through my house (no access). A cursory Google suggest it's ok, but obviously needs to drain hence the screed and Ako.
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Sounds like you've only seen it done properly! I can assure you a simple concrete base is a luxury option in the back gardens of SW London. Hauling a whacker into the garden down the stairs puts people off using them.
Polygon
Airhead
Currently working towards screeding this patio slab for a padded fake grass section. I know that will get me some hate on here but I want a soft/safe surface for kids to play on and it's hardly an epitome of biodiversity at the moment. The rest of the garden will be getting a lot of plants eventually.
Anyway, current plan is to build formwork around and sure up a couple of the sides with vertical faces in reinforced grano concrete, and screed with the grano at the same time. The nearside will be one face of a flush trough water feature and the LHS will be exposed where the path will slope down to get 150mm below dpm. Currently the slab is level with dpm but there's a gap between it and the house so an Ako drain will be going in to carry rainwater from the downpipe on the right to the drains. Thinking of using OSB with floor protection sheets tacked on for the shuttering to get a decent finish to the sides at lower cost than proper phonelic ply.
Any thoughts/ideas on this approach?