Stucco News

Question and answers on Stucco and Plastering July, 2013

     Corner beads for plaster and stucco

The first corner

Please Click here or on the picture for a larger view.
The first corner beads came out in the late 1930's.
I got this from a house in Washington, DC that was built
about 1938. These beads were used on the interior plaster. The exterior stucco didn't have any beads. I haven't seen metal beads on any exterior stucco done before the 1950's.
The metal wasn't expanded, but folded over and holes punched for mortar keys and nail holes.
                                            Veneer plaster beads
Veneer plaster beads
Metal corner beads for veneer plaster, also called "mini beads", or type 900 beads, are the same size as a
drywall corner bead, with a 1 1/4" flange.

The expanded mesh is much finer than a conventional plaster bead, which has a 3 inch flange.

If a drywall bead is substituted for veneer plaster, the flange should be painted with a plaster bonder
before plaster application.

Back to stucco:

Quick corner for stucco has a woven wire flange.

Unlike conventional plaster beads, the corner
is reinforced with wires, and is made to be completed
embedded in the brown coat.

These are made for exterior use.
Quick corner
                          "one-coat" stucco application on a
                          Toll Brothers house.

After 4 years, type 1-A corner beads
are already falling apart.

This chimney is on a fake "one-coat"
stucco application on a Toll Brothers

The application is a thin cement basecoat with a synthetic finish,
which is a rubbery paint with plastic sand.

Toll brothers pawns this off as real
stucco to the public. It is sad to see
a product that falls apart in 4 years.

These one coat systems are notorious
for lawsuits for water infiltration.
Stripping arrises
                          (outside corners) in plaster and stucco
Before metal beads were invented,
the arisses (outside corners) on stucco
were done by stripping.

A wood strip is nailed to the wall
and the wall is straightened to the
wood strip.

When one side sets up, the strip is put on the other side.

On historic interior plaster, we also strip the finish coat.

A simple homemade tool can be made to true up
the arris. These work on short areas.
simple homemade tool
Arris done with arris

A tool like this was used on the finish
coat on this circa 1928 house.

I don't know about plastic corner beads.
I have never used them, and doubt I ever will.