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Correct height difference between DPC overhang and drains

Lumen

1980s house, am currently relandscaping the back.

In the attached pics, you can see that the drop from the DPC "overhang" (what's the proper term?) and the drains varies between about 200-240cm. The total drop down to to the bottom of the plastering is about 400mm.

It's clear that the gravel has been moved, sunk or migrated such that the drains are exposed. That'll get sorted with a new patio.

Question is, given that I'll be digging all this up anyway, is there a particular finished ground level to aim for with the respect to that DPC overhang? The set of steps shown on the edge of one pic are probably going to be changed anyway so I'm not concerned about step rises.

I'd like to get it right and if that means changing the level of the pipes I can get that done, but obvs dropping them would have consequences for the fall of the drains so that's probably a terrible idea.

Advice please!

…will add photos from phone shortly…

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Penn

https://www.boards.ie/discussion/comment/122785958#Comment_122785958

Given the height of the gulleys, I'd say it was proposed to be finished in concrete on the gravel but it was never finished.

The Continental Op

https://www.boards.ie/discussion/comment/122785958#Comment_122785958

I bet there was hardly enough gravel to do the job properly.

Lumen

https://www.boards.ie/discussion/comment/122785688#Comment_122785688

Having been a landscaper my guess is that has never had any topsoil on it, job was never finished.

It was "finished" in gravel, maintenance of which has been the bane of my life since I bought the house!

Penn

Typically you need a minimum of 150mm from DPC to external ground level. You can go more than that, but you shouldn't go less than 150mm, particularly for an existing house.

The Continental Op

Having been a landscaper my guess is that has never had any topsoil on it, job was never finished. Good thing is it looks like you have plenty of room under the DPC. Not sure of Ireland but UK was always min of 150mm between dpc and surface level.

Lumen

photos