I'm working on creating a concrete retaining wall; which is between two large rocks; and will support a wall, and roof on top of it. The whole building is a 3m x 3m shed. When the retaining wall is complete (I'm building it in sections) it will be an area of 3m x 1.6m
Would the retaining wall benefit from expansion joints? If yes; how do I create an expansion joint? Would creating a grove in the concrete wall be enough? What size would the grove be; and should it run horizontal or vertical?
As there are rocks on either side; I imagine the concrete can only expand "up" - does this risk cracking the wall that it will start supporting?
The concrete is supporting earth on the "outside"; so its temperature will be relatively stable.