Stucco News

Question and answers on Stucco and Plastering-- July, 2013




    Plastic corner beads in Florida

We represent an Owner (i.e. Construction QA) on a multi-family housing project in West Palm Beach, Florida.  The plastering contractor is using plastic accessories and in some band details, they are using trimmed cornerbead (see attached photos).

We do not believe the method being employed is acceptable but there aren't specification requirements or details that mandate "casing bead" to be used in the location where they are using cornerbead.

We have concerns about the ability for the plaster to be properly contained but do not have an industry standard to point to in order to cite this as a deficiency.

Are we unnecessarily concerned?
Plastic corner bead
                  on stucco band
  This should be fine. Since the
stucco is on block and the band
is packed solid, this should work.

I have never used plastic beads before, but here they are being used
to form the shape of the band.

The mortar will bond fine to the
block without any additional reinforcement.               


Corner bead filled too
                          full.
"The finish coat will be standard portland cement and requires the 1/8-inch thick coat."

There is no room for the finish coat,
which should be 1/8" measureable at the bead.

Besides leaving a sloppy edge, which could be hidden with the knock down finish, the edge will flake off and chip easily.

These beads were made to be left
exposed.

Also If you don't pack the corner beads they tend to split wide open in the future. This is true for metal, and I am sure plastic is probably the same.This is also called back-filling.