Hi everyone. Desperately hoping for some advice here. I'm sure my story isn't all that unique. We gutted our house and ended up spending a lot more than what we bargained for so ended up using our original contractors to build the retaining walls for our garden beds and then ended up using a second cheaper contractor to finish them off. Despite our protests - the original contractors used breeze blocks, and although they claim that they used sika to waterproof them, it doesn't appear they did that. They also didn't put drains in. Fast forward - three of four walls are completely sodden with the render crumbling off and cracks appearing in one of the walls. We can't afford to tear the whole thing down, so the question is this: for a solution that will last a few years, could I scrape off all of the crumbling render/plaster, use a bitumen sealant like blackjack, then use on a 'brush-on' tanking paint, use some type of better render/plaster and then paint? One builder suggested using mesh as one of the steps, but I'm not sure I would be able to do that on my own (or with my husband's help). Any advice you all could give would be greatly appreciated. I realise this isn't a perfect fix, but looking for a solution that will get us through the next 2-3 years. Thank you!