Here's a picture of some ground contact pt 6x6's used as a retaining wall. It was 18 years old. I had to replace about half of it. The rest was in "ok" condition. A lot of the rot started where it had to be cut because the wall curved. The fresh cuts were done to make it easier to dispose of.
How about rule 3, build the wall out of rock. Took me 2 years to build a rock wall 120' long and from 2.5' to 4' tall with two sets of steps.
This doesn't include any recent pics with roses in front of the wall and other landscaping to the left and around the steps, also a little goldfish pond at the far left. Before the wall, the lawn in front of the porch was almost at 45 degree slope. Not easy to walk on especially when wet. Rocks were all collected on my property, most of the big ones started out barely poking out of the ground but I just kept digging. All rocks dug by hand by myself. Thing that looks like a yardstick, is a yardstick. Bottom first row dug in by hand. Under porch was dug out
2 feet down using a rototiller on one little tractor and the other one (rustbucket) plowed some loose dirt but most of it was shoveled into a cart and dumped where it was needed to fill in behind the wall. It started off straight, but when it got crooked, I liked that look better and went with it.
Yes, Eastern Tennessee. If I had thought of it at the time I may have dug it down a little more to be sure. I haven't seen any movement and I suppose it can move a bit without damage since the only place I used mortar was in the steps.
I can't argue that rock would not need replacing. But while I'd like to see the pt lumber hold up better my wall is only about 25 ft long and at it's highest point only 4 boards tall. It took a day to tear it down, weed out the unsalvageable boards and rebuild it.
I have no choice about having a wall. It is along one side of the driveway and there are trees in the ground that would have to be removed to get an acceptable natural slope instead of a wall.
Looks like that "Top Choice" crap that Lowes sells. Their treatment penetrates maybe half way into the wood, leaving the centers to rot outward. I had some of their 4x4's rot out in 5 years. Lowes won't back the warranty. They say you have to deal with the lumber company. KC
I've got trees and bushes in a natural area that is about 2 ft higher than the drive at the highest point. Some of the trees and bushes are less than 2 feet from the edge. I would have a slope greater that
45deg. I like ivy and other ground cover and I have used it in a number of places but it has to establish. Structures are established when you finish building them.
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