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I
would
like to create a retaining wall. My intention was to use
cement block. My question is can I back fill against the
stucco?
I do not
want people to see the block wall if possible however do want
the
stability
of the cement wall.
Reggie's
Ideal retaining wall
Top
section
Not every detail here is 100%
necessary,
but it isn't much to do it right.
Starting from the top, it is important that water
doesn't run behind the stucco, popping it
off. The ideal cap for the top is brick or stone angled down for a
drip edge. As an alternative, the top can be coated with stucco and
rounded
off, or angled. This method works, but isn't as good, because the
stucco
cap can spall due to water sitting on the top.
The back side of the wall needs to be parged with
portland cement mortar, or better
yet, waterproof portland.
The parging can be coated with waterproofing, but
this is optional. However, it is
cheap insurance against leaks that can pop off the stucco.
Stucco should be a full 3/4" thick to prevent cracks
at the block joints. Also, it should be done by experience plasterers
to
avoid seeing the block joints.
Bottom
section
The bottom should have weep holes (drainage holes)
to prevent water
from running
through the wall. PVC pipe works good because it doesn't rust. The
advantage of the pipe
is it carries the water away from the wall, instead of allowing water
to get behind the wall,
causing damage and staining.
It is also a good idea to fill the back with gravel for drainage. Note
how I have the end
of the pipe wrapped with screen to prevent clogging.
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