How can I avoid having a retaining wall eventually tilt outward?
The retaining wall should of course first be designed for the soil and service conditions. Even so, most retaining walls gradually tilt outward during their lifetime. A small amount of tilt will do no harm, but to avoid the illusion of instability it is well to offset the tilt ahead of time by providing a minimum batter of 1/4 inch in 12 inches.