Rammed earth walls for buildings. Page: 20
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20 Farmers' Bulletin 1500
From these results it would seem necessary, if periodic repairs are
to be avoided, to veneer the outside with brick or stone slabs or to
apply a standard stucco of cement or lime mortar over a lightweight
metal lath. The lath should be securely fastened to the wall in the
same manner as recommended for other types of masonry construction.
It would also seem advisable to tar or otherwise waterproof
the earth wall before applying the stone or brick veneer or the metal
lath for stucco. Tile next best practice seems to be the use of two
or three coats of outside linseed-oil paint.
Tar and asphaltic base preparations are effective when properly
applied. A decorative paint is generally desirable to hide the black
color, and experiments indicate that outside oil paints can be used if
the tar base is first given a coating of aluminum or other flake metal
floated in a good outside varnish.
The builder is referred to the recommendations of R. L. Patty, lwho
has conducted extensive experiments to determine durable coverings
for rammed earth walls. His findings are given il detail in Bulletins
277 and 298 of the South Dakota Agricultural Experiment Station,
Brookings, S. Dak.
Directions for stuccoing and applying metal latl can usually be
obtained from cement, lime, and hardware dealers or from associations
interested in these materials.
COST OF PISi WORK
Builders differ in their reports as to the quantity of pise de terre
that can be placed in a day and also as to the cost. Although the cost
depends upon a number of factors, as in other types of construction.
the following may serve as a guide:
In England pise dwelling-house walls 1 foot 101/2 inches thick
were built 35 per cent cheaper than were 11-inch hollow brick walls
in a similar structure. In another house there was a saving of 8()
per cent in favor of pise as compared with brick walls. In still another
the pise walls, 18 inches thick in the first story and 14 inches
in the second, cost $3.64 per square yard of surface as against $5.07
for 11-inch hollow brick wall. The labor cost was 30 cents per hour.
It should be borne in mind that any saving in cost resulting from
the use of pise is confined to the erection of the walls, as all other
construction in two buildings otherwise alike would be practically
As to the quantity of earth that can be placed in a day the following
from an old report seems to be substantiated by recent experiments:
Three men can place 54 square feet of 18-inch wall of tlhe
first story or 48 square feet of 14-inch wall of the second story in
one day. Two of the men were employed in ramming and occasionally
helping the third, who loaded a cart with the earth, hauled it a
short distance, and then placed it in the forms.
PROTECTION FROM ANIMALS AND ANTS
Most earth walls are subject to attack by rats, but many builders
claim that pise de terre is so dense that the rats can not gnaw it
and that it is free from such attacks, especially when a good masonry
foundation is provided. However, in localities where rodents
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Betts, M. C. (Morris Cotgrave), 1875-1936. & Miller, T. A. H. (Thomas Arrington Huntington), 1885-. Rammed earth walls for buildings., book, May 1937; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc3436/m1/22/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.