How's it going britishrallying? Have you started?
Redpis: great work, looks excellent and high quality.
Posting as I've a similar problem - i.e. no drainage in a clay soil.
In short the water table rises to the point where it flows into my conservatory and lounge sub floor - (the result of this plus no ventilation was a rotten floor which I've since rectified and replaced).
New floor. Ignore the moving-in clutter!
My task now is to divert the ground water and prevent the water rising so high.
Before we bought the house!
Investigating and digging
Found the conservatory down pipe led to this poor excuse for a soak away at the corner of the conservatory! Must've been cowboys. This pit, and others I've dug, fills up from underground after heavy rain.
The good news is that I've an existing man-holed drain in the garage (the lean-to with patio doors far right of the image above) which can take the water away. I'll need to break into this somehow.
I'm only really concerned with pipe runs around/ near the house perimeter at the moment so water doesn't come in and I can crack on with finishing the house. I will probably add to the drainage network laying drains in the rest of the garden when we come to landscape it
I'd be grateful for any advice and I'm sure I'll be back asking for more help, but my questions (after all this rambling!) are
1) as daft as it sounds I'm having real trouble finding a supplier of the perforated pipe and fittings. Been passed between Drain Centre, Pipe Centre and PLumb Centre with no joy!! Where did you guys go?
2) Redpis, I had planned to use geo membrane, as was quoted by a contractor too, but from what Thermo says worries me. Has your experience led you to think you wouldn't use the membrane if you did it again?