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When doing cellars to stop damp seeping through once plastered, to seal the walls we used a product called
This process is called tanking & is well suited to render
Rose,
You're absolutly right that the render shouldn't go down to the ground. Ideally there should be a couple of courses of engineering bricks before the stop bead however this can have a big impact on the way things look we sometimes stretch this a bit depending on circumstances.
Rendered wall tops can and do work if they are constructed properly. Rendering over a fine mesh can help as can a very slight dome to make sure that water can get away. The big problem is that water tends to run off in the same places which can cause algae to form or 'stain' marks that look unsightly. Therefore rendered walls always need to be cleaned regularly to keep them looking at their best.
have a look at this garden we constructed 4 years ago. The walls are still intact and looking good and they've now been through two incredibly harsh winters
All best,
Dave
Thanks All, very useful to have your input! Given the hard winters we've been getting I am inclined not to take chances with the design but as you say Dave this will impact on the look, especially where there are complex arrangements of steps, raised planters, walls etc. All part of the challenge!