We're building a pea gravel patio behind a retaining wall that at its highest point will be about 2.5 feet. Behind the high point there's an area approximately 10x12 that will have to be filled. My question is: cost aside, is it OK to completely fill that area with 3/4 gravel or is there some reason I'm better off filling it mostly with dirt and just putting 6 inches or so of gravel on top of the dirt? Keep in mind the top layer will be 2-3 inches of pea gravel. Thanks.
Gravel or dirt fill behind a retaining wall?
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