Terraces, if too steep, will not stay sodded, and if too flat, take up
room which would otherwise be a part of the lawn. The neatest way is to
place a retaining wall along the terrace edge. This wall is built in
the same way as the wall to hold the earth in a barn approach described
on page 60.
[Illustration]
If the wall is over one foot high steps are necessary. A most
convenient arrangement is to have the bottom step come flush with
the face of the wall, making it impossible to fall over one or two
projecting steps in the dark.
In building, insert a stop plank between the front and back forms to
prevent the concrete from going to the full height of the wall. The
bottom of this plank should be kept at a height above the bottom of the
wall sufficient to form the first step.
After the concrete for the wall is placed, remove the section of the
form where the steps are to come, and dig out the earth to a depth
sufficient to hold them.
The remaining steps are built in the manner described on page 90.
After the concrete is placed, the steps should be closed to traffic for
at least one week.
In the background of the photograph on page 72 may be seen a double
terrace wall of concrete, each wall 5 feet high.
[Illustration]