I'm planning a 4ft high retaining wall in my yard and I need a vertical
drainage layer behind it (stone wrapped in filter fabric, with a perf pipe
at the bottom that drains via gravity to daylight). The local material
supply has 3/4" washed gravel for $55/cuyd, and Recycled Concrete Aggregate
(RCA) for $35/cuyd.
Does anyone have experience with using RCA as drainage stone behind a
retaining wall instead of washed gravel? Pros/cons?
I can only say that crushed concrete make a good paver base, packs hard,
drains well. Gravel is rounded, isn't going to pack, drains well.