Retaining
walls are used in areas where sloped terrain would
either be too confining or too dangerous.
They do just what their name implies—retain
earth or soil. They
allow a space to change elevations immediately vs.
changing over a distance.
They might range anywhere from an 18” short
seatwall to a 13’ poured concrete foundation wall that
separates a steep lot from front to back.
Whatever the instance, they usually are the tool
used to provide a flat, leveled area to an otherwise
sloping terrain.
Retaining
walls can be
constructed of brick that is used elsewhere in the
architecture of the home, stone, stucco, interlocking
masonry unit (often referred to by their trademark name
of Keystone, Versa-lock, etc.), or timber.
Usually architecture, engineering requirements,
and/or budget will dictate which of these materials are
used.
Free-standing
walls are similar
to retaining walls in appearance but will always be
exposed on both sides and usually finished with the same
details on both sides.
Many times they are combined with decorative
columns that both add structure and linear punctuation
to the walls.
They
can be built solidly, with paneled insets, or even with
openings that breath and allow air circulation as with a
pierced brick wall.
They are also available in brick, stone,
stucco, or a combination of those materials in a way
that will aesthetically tie back in to the existing
architecture.
Steps
are needed to allow transition from one level to another
in the landscape. The
vertical portion of the step is called the “riser”
while the horizontal portion is referred to as the
“tread.” Proper
design is necessary to make these transitions both
pleasant and easy for the user.
Steps might be incorporated into a retaining
wall. Or
they might be stand alone steps that are built into
existing grade.
When
space allows steps can be grouped individually.
In tighter spaces they should be combined with
landings to allow the user to rest and catch their
breath between risers.
When transitioning very steep slopes it is
necessary to build “cut-backs” between step
groupings. These
are landing and steps groupings that go across the slope
as well as up and into the slope. They capitalize off of the distance across the slope to gain
elevation when the distance from front to back is too
short to reach the maximum grade.