Hi, I have my neighbours adjoining garage that runs along one side of my garden and thought adding some raised beds with concrete blocks with a bit of cladding on top to make it look good. Got some questions; 1. Would building this along the garage need permission? Would it potentially lead to structural issues? 2. Would I be better off leaving a gap between garage/blocks? 3. Any recommendation on the foundational base?
No permission is needed, shouldn't be any structal issues,as your planter foundations will be shallow, usually 150mm is ample, & 300mm wide if using a 100mm block.(Allows 100mm overhang each side of wall.) Wouldn't leave a gap, as this allows crud to get down there & results in a damp wall. I would just paint wall with 1 or 2 coats of something like 'Everbuild 908 Black Jack Damp Proof Liquid Membrane' from TS 10290 to waterproof wall.
As it's not your garage, I would expect there would be some requirement before you start painting anything onto it! If nothing else a quick discussion with the owner.
I misread that post. If built a rectangular planter you left a 50mm or so, between garage wall & planter wall, you wouldn't need to seal garage wall, probably
I personally would leave a gap as it's not your garage. A small gap can be closed above using whatever you will be topping your planter with, and if much builds up behind over the years, a jet washer should soon shift it. Not-a, are you sure you want to build this using block? Why not sleepers or similar? No founds required. And generally a 'warmer' look too. Sleeper raised bed with a trellis backing - that'll cover the wall nicely.