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What are screeds
?
An example of horizontal and vertical screeds.
A screed is set
horizontally at the top between the corner strips. Another screed is
set between the horizontal screed and the metal weep screed at the
bottom. A horizontal screed is being set in the middle.
I used arrows to show
vertical screeds set about 5
feet apart between the back of the frieze board and the weep screed at the
bottom. Now you see why weep screeds are
called screeds. A straight edge is used for this, either a rod or even
a straight board. There are a lot of methods for doing this.I'm just
trying to provide an overview. The end result is to get the wall
straight, or a curve, if you want a curve
Wall is then filled and
rodded off in between the screeds. In concrete work, a straight
edge is called a screed, and rodding off the concrete is called
screeding. In plastering, the straight edge is called a rod.
The other
side is done
the same way. Here, the corner strip is removed preparing for the finish coat.
The walls are dead straight. The most important step in plastering is
the brown coat, and straightening the brown coat. The finish will
follow the contour of the finish, whether it is straight or looks like
the ocean. The idea of the finish coat magically making everything look
right doesn't work.
Larger walls are more complicated, but the
principle is the same.
The screeds illustrated here are called "soft screeds", because the are
set and filled at the same time. It is OK in inside plastering to let
the screeds set up overnight, as long as care is used to fill in
between the screeds, and not over the screeds. A screed in cement if
left overnight
will show a hump in the finish coat. I plastered a hallway in a school
in Maryland many
years ago with cement plaster, that you can see a hump where every
screed was through
the finish. It got late on me, so I left the screeds to set up
overnight. I'm not going to tell you where it is, but my plaster chalk
boards and stucco ceilings still look fine.
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