for lath and stucco
I have a Specification I
was partly copied from the
specifications of Portland
Assoc. from 1929.
I found it from the web and
used it for submittals. It is what we use. Also, note there
are no expansion joints because they didn't have them in 1929 and I
see why they do now.
I did government work for years and had
specifications that at times were impossible to follow or simply
As a warning to the plastering contractor, since these government specs
are part of the bidding documents, you can be held to use them any
You may have my specs approved instead, and edit them to suit your
I had these on my RTBullard site for a long time
am amazed how many people use them.
The most important thing that I left out is that
work must be done
by skilled, experienced plasterers.
You can copy and paste the info below or download
a pdf file by clicking here.
Without further adieu, my Specifications
for lath and stucco:
for lath and stucco
Tar paper or suitable
shall be used on bare wood surfaces.
be used on all wood framing. Fasteners shall be spaced no more than 12”
Portland cement stucco
applied in a 3-coat method to a nominal ¾” thickness.
Scratch coat shall be
cover Lath and cross-raked to provide an adequate key for the basecoat.
Scratch coat shall set at
2 days before the application of brown coat.
Brown coat shall be
to a reasonably straight and true surface and surface floated and left
rough with open pores for and adequate bond of the finish. Brown coat
cure at least 3 days before application of finish coat.
Finish coat shall be white
cement, lime and sand with a color if desired. Finish coat shall be a
1/8” and floated or textured as desired.
American Portland Cement
Specifications (c. 1929)
5 pounds, dry, hydrated
1 bag Portland cement
Not less than 3 cubic
sand (passed through a #8 screen)
There are about 5 shovels
cubic foot. We use about 4
cubic feet, but no more
cubic feet on porous surfaces
Water to make a workable
Use WHITE Portland
cement in the
mix in the same proportions as above.
To color the stucco, add
than 10 pounds pigment for each bag of cement contained in the mix.