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Is there a clear run left beyond the patio to your mains drainage?
This is what we have now.
The pipe under the patio was what I was thinking - that way I could diy.
I think I need to reconfirm what exactly we are doing.
Idk if we'll be here in 5yrs. Ball park what would you expect the cost of 6x7m concrete slap + paving + removal of existing slabs and raised beds to be? (owner supplies slabs)
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hugo7
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Allowing 7 days for 3 people, 2 to dig, 2 to prep and concrete, 2 to lay, 1 to finish. Materials: 8 tons concrete, 1 ton mortar (2 if stone surface), £50 for pipe and shingle, £50 mixer hire (if not local), 1skip @250. Should be about £4700.
Note: that's contingent on what's found in the ground when digging.Get them to fix into that downpipe with a 3 or 4 degree fall to the edge of the patio, allowing for a 2 degree fall to the far side of the lawn.
ColinTheBald
There's a degree of you get what you pay for. Over clay I would definitely use concrete as a base. The general guideline would be to use at least 200mm/8" of type 1, compressing every 2", this will mean digging to 250mm/10" of finished surface, I doubt they will. Is there a clear run left beyond the patio to your mains drainage? If not, insist that they fit a perforated pipe encased by 4"/100mm of shingle to it and run the pipe beneath the new patio out to the lawn, this will allow you to attach lawn drainage at a later date.
It's easy to get a perfect finish over 2" of type 1 it just won't be there in 5 years.