Getting the basics right - The Hempcrete Topic: Designing and Building with Hemp-lime - page 105

time required for the wall to dry out, meaning that it takes longer to dry to moisture levels
that are optimal for thermal performance, and occasionally that the internal environment is
too damp for the building to be occupied.
An extreme case of staining on plaster as a result of fin-
ishes being applied too early.
In addition, if plasters and renders are applied too early then staining of these finishes can
occur, as liquid moisture evaporates from the surface and leaves tannins, which have been
carried through from the hemp shiv. This is a purely cosmetic problem, and the stains can
be painted or lime-washed over when the wall has dried sufficiently, but it is unsightly and
can incur extra costs (in terms of reapplying paint). In more extreme cases (see photo op-
posite), it is also a clear indication that there were serious contractor errors at the construc-
tion phase, and/or that the finishes have been applied when there is still a very high level
of moisture in the wall.
For information on drying times and how to gauge when a hempcrete wall is ready for the
application of finishes, see Chapter 16, page 215 .