We have a 12 foot high retaining wall (12" blocks). We installed drains around the concrete footers. To fill behind the wall will be approximately 4 feet wide and forty feet long and of course 12 block high. It will sit against a moist hill. Should the back fill be all gravel and if so does it matter what size? The block are filled with mortar for added strength. How long should the wall sit before we back fill?
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