Earth mortars are earth and clay thinned with fine-grain and
/ or fine-fibrous additives. Depending upon their usage they
are known as earth masonry mortar, sprayed earth mortar or
earth plaster mortars or rendering.
Earth masonry mortars are used for bricklaying with
earth bricks as well as with synthetic, fired or stone bricks.
They are typically thinned with sand.
Sprayed earth mortars are used for filling out timber
frame panels, for the manufacture of inner leaf coatings,
interior walls or as filling in floor cavities. It is thinned
with mineral or organic additives that are suitable for use
with a mixer and spray-pistol. Much like some plasters, it
is applied from a spray-pistol in as many layers as are necessary
to fill the cavity or reach the required thickness.
Earth plaster mortars or rendering are used
for plastering internal walls and ceilings and in some cases
exterior walls if these are protected from direct rain. Sand,
straw or other organic fibres are typical additives. The fibres
serve to bind the plaster and reduce cracking as the material
dries. Due to its moisture regulating properties, earthen
plasters are particularly suited for use indoors.
All earth plasters are available in a wide variety of densities
and with different additives or colours as well as in different
quantities and packaging forms. As earth mortars do not cure
they can be delivered in large quantities and can be stored
under normal conditions over long periods of time until required.