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I'm planning to lay around 10m of plastic channel line drainage (the kind that comes in 1m lengths with grating on top) around two walls of a house. It's an old house, with soil abutting straight onto the walls. If I dig a shallow trench to lay the channel in, what's the best way to keep it in position? Ie, should I bed it into concrete/cement or lay it directly onto the earth of the trench; and should I be laying it flush against the wall or laying a few inches of concrete/cement between the wall and the channel?

T,

THIS TYPE OF DRAIN CHANNEL SHOULD BE LAID ON AN HAUNCHED UP IN CONCRETE.

THIS WOULD MEAN CREATING THE FEW INCHES OF HARD SURFACE INBETWEEN WALLS AND DRAINS THAT YOU MENTION IN YOUR POST.

ONE PIECE OF ADVICE, I WOULD NOT LAY THE UNITS ADJACENT TO ANY LOOSE TOPSOIL AS THIS WOULD SOON BE WASHED INTO AND CLOGG UP THE CHANNELS.

WALL-CONCRETE-CHANNEL- PAVING-SOIL WOULD BE MORE APPROPRIATE.

A.