Hardscape & Grading第 67 / 100 题
A retaining wall's footing or leveling pad should be placed on what?
a.Loose topsoil
b.A layer of dry leaves
c.Compacted, level base material at proper depth
d.A single row of bricks
解析
The base or leveling pad of a retaining wall must rest on compacted, level base material set at the correct depth so the wall does not settle or lean. A poor base is a leading cause of wall failure. Getting the first course level and solid is essential for the whole wall.
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