Specifications
for lath and stucco
I have a Specification I
wrote that
was partly copied from the
specifications of Portland
Cement
Assoc. from 1929.
I found it from the web and
have
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
don't
see why they do now.
I did government work for years and had
ambiguous
specifications that at times were impossible to follow or simply
ridiculous.
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
time.
You may have my specs approved instead, and edit them to suit your
needs
and preferences.
I had these on my RTBullard site for a long time
and
am amazed how many people use them.
The most important thing that I left out is that
this
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:
Specifications
for lath and stucco
Tar paper or suitable
vapor barrier
shall be used on bare wood surfaces.
Galvanized self-furring
lath shall
be used on all wood framing. Fasteners shall be spaced no more than 12”
on center.
Portland cement stucco
shall be
applied in a 3-coat method to a nominal ¾” thickness.
Scratch coat shall be
applied to
cover Lath and cross-raked to provide an adequate key for the basecoat.
Scratch coat shall set at
least
2 days before the application of brown coat.
Brown coat shall be
straightened
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
shall
cure at least 3 days before application of finish coat.
Finish coat shall be white
Portland
cement, lime and sand with a color if desired. Finish coat shall be a
nominal
1/8” and floated or textured as desired.
American Portland Cement
Stucco
Specifications (c. 1929)
Base Coats:
5 pounds, dry, hydrated
lime
1 bag Portland cement
(94 lb.)
Not less than 3 cubic
feet
sand (passed through a #8 screen)
There are about 5 shovels
to a
cubic foot. We use about 4
cubic feet, but no more
than 5
cubic feet on porous surfaces
like block.
Water to make a workable
mix.
Finish Coat:
Use WHITE Portland
cement in the
mix in the same proportions as above.
To color the stucco, add
not more
than 10 pounds pigment for each bag of cement contained in the mix.
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