Rendered retaining garden wall

[Kf 1958]

We have had a new retaining wall built in concrete blocks and rendered with repainted self cleaning render.

Behind the wall will be a plant border and the gap for the border was filled with sand/soil by the builder.

Every time it rains we get puddles of water sat on top of the wall and certain areas of the wall get very wet.

Having read some other threads I am now wondering if there should be some kind of water barrier behind the wall between it and the soil?

Also wondering about the quality of the rendering as we get puddles on top, and there are some holes, not sure if I am expecting too much.

I’ve added some pics of rain water on wall, the

and would value your comments/advice

thanks

 

[stuart45]

It's worth having a coping on top of the wall. and a drainage system behind it.

 

[Kf 1958]

Thanks for your reply, what sort of drainage system would you recommend?

thanks

 

[Dewalt2003]

was there an initial scratch coat put onto the blocks, with a waterproofing agent added to the mix?.
looks like they have top coated in 1 hit monocouche render.
this can be sealed with a clear waterproofer, or maybe some drainage holes drilled at the bottom of retaining planters, as I assume that they are filling up and holding water. monocouche is water resistant for rain etc, but for what you have ,a tanking waterproof system should have been applied, to prevent the penetrating water.

 

[Kf 1958]

Thank you

 

[Alastairreid]

The back of the wall should have had a waterproof membrane put in between it and the soil.
Looks a tidy enough job.

 

[Kf 1958]

Thank you

 

[^woody^]

There is no way you will stop that staining with that design of rendered wall. Next comes the algae.

 

[Kf 1958]

Oh dear!