![]() in your case i would have put in two 10' in from the outside of the walls. Compact class 5 on the backside of your baseblock and install a perforated drain tile that drains at the lowest point of the wall or put outlets on the first unburied course generally one every 50'. The one thing that nobody has taken into account is the need for water drainage. Any wall greater than 4' needs a permit in general. We bury the base course of our retaining walls which is generally 6"-7" with at least 4" of Class 5 gravel underneath. I landscape in MN where the frost table is much greater. The question is more one of how many yards of concrete will you need to build the footing. The path of least resistance is to knock over the wall.īlocks, attached with mortar, to the soil behind the wall about as strong as a 2x10 resting on its edge. Side to side, their goal in life is to tip over, and they are damn good at it.īlocks work because they are tied to very solid, heavy things at the top and bottom that run the length of the wall, and have regular supports at a right angle to the length of the brick.Ī 1' deep pile of soil, behind a 4' block wall, 1 block long, weighs 500 pounds. The quantity of material needed to build the wall, will amaze you.īlock walls work in compression, heavy things directly on top of them is fine. You will be shocked at the cost, and not in a good way. The quote will cost very little or nothing. Please, please - Get a quote from a company that builds retaining walls. Let me know if you need me to try and sketch the design of the wall for added context. Hope the info I provided is sufficient to get help and answers from. What about for cinder block walls, is it the same? Or the added strength and stability of rebar+mortar, or footing+rebar+mortar, makes it so I don't have to dig as much? ![]() I know that for gravity walls on sloped yards I need to measure 5' out of where I plan my wall to be and dig the difference. (added info: at the lowest point the wall is going to be close to 4 feet tall, not counting how deep I have to dig and how much of the wall needs to be underground)ġ) Footing or no footing? Can I start setting the cinder blocks directly on base gravel, with rebar vertically every 3-4 feet for added stability, and filling them up with mortar as I go? Or do I need footing?Ģ) If I need a footing, how deep into the ground should my footing be? Not how deep the footing itself should be (I'm thinking I'll go with a 1' footing-feel free to comment on that), but rather how deep into the ground do I need to dig my trench in order to set the footing? I'll be using cinder blocks (with mortar to join them together and rebar for added stability). ![]() I'm looking to build a retaining wall on my sloped backyard.
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