Quote:
Originally Posted by EarlyPorsche
I am thinking about building some retaining walls out of cinderblock in my yard.
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Bad idea, even using a rule of thumb 1:4 width to height ratio for a parapet you exceed anything reasonable going that narrow. Retaining walls are notorious for failure, even knee height ones.
There are special interlocking Concrete landscape units designed for your application. I suggest you focus your research in that direction.
One of the main advantages of using concrete landscape wall units is they are typically mortar free and self weeping. Last thing you want is for water or moisture to build up behind a wall like that. The horizontal pressure and change in coefficient of friction in the soil is a double strike. Add rain and strike three.