Just had a new conservatory (insulated cavity walls) in which a wedge of soil was removed as the lawn slopes slightly up from the house. It's left me with a channel 400 deep x 4000 long x 400 wide before the lawn edge. Options are, either digging out more and making a walkway round the conservatory and constructing a normal retaining wall, (more expense and more lawn taken) or creating a drainage channel against the brickwork.
Q1. I prefer the latter but is it a good idea? and how do I do it to prevent damp? I'm breaching the new DPC by 4 courses of brick! Been suggested by a friend that I first aquaseal, then lay a land drain along the length and fill with clean gravel leaving the soil/lawn 400mm short of the brickwork
Q2. Is me friend right or do I need to do more? ie. a DPC membrane vertically installed somewhere.
Q3. Any other ideas?
I would make a path with a retaining wall,with the other option its more hassle and wont work aswell,best to be safe than sorry.To keep the cost down you could build the retaining wall out of railway sleepers.