Our experts prefer crushed stone for the base rather than naturally occurring gravel dug from a pit. Crushed stone is a little more expensive. However, it provides better drainage, and because of the sharper angles on the stone, it requires less compacting, and once its compacted, it stays that way.

Joe and Jake have found that crushed stone sized between 1/2 inch and 3/4 inch is best suited to handle the heaving forces created by the harsh freeze/thaw cycles here in Minnesota. Avoid rounded stones like pea gravel or river rock; they dont form strong interlocking bonds like angular stone.

Leave the stone no more than 1/2 inch higher than you want the final height to be, and then make a couple passes with a hand tamper or plate compactor. Youll notice the stone is almost 100 percent compacted as soon as its laid in the trench. The same type of stone will be used for backfilling, which also eliminates the need for hauling in multiple materials.

Continued here:
How to Build a Sturdy Retaining Wall That Will Last a Lifetime

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October 7, 2019 at 8:42 am by admin
Category: Retaining Wall