I'm going to be installing a stacked (mortarless) retaining wall on the edge of a newly poured slab (5" thick) designed for additional parking. The wall will be 3 feet tall.
My question is: Can I stack the bricks on the edge of the cement slab or must the first course be laid on soil? The bricks have a downward lip on the back side that would hook right over the edge of the cement.
Each brick is 16" x 10" x 6" tall. There will be 6 courses. Each brick weighs 60 lbs. After the wall is built, the weight per 16" x 10" area would be 360 lbs which is well under what I've been told is the load capacity for the slab (as long as it cures properly). I would backfill the wall with gravel for drainage, and the design of the bricks makes them lean back into the hillside which is supposed to increase stability.
Is this a bad idea? Any help would be much appreciated! My knowledge is very limited when it comes to this project.
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