Civil Engineering Reference
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tom of the hempcrete above the ground, to protect it from standing water or being con-
stantly wetted by splashback from rain hitting the ground, and a good roof overhang to
throw rain away from the wall. In practice, however, many hempcrete buildings have been
built with alternative, compensatory eaves details without causing problems. The degree
of roof overhang should be considered carefully alongside the choice of external finish for
the walls.
A large eaves overhang is not always necessary on
hempcrete buildings: at Callowlands in Watford, a hidden
gutter and a specialist hydrophobic lime-based render al-
low the overhang to be eliminated.
These factors, together with the requirement to keep all finishes breathable, the extended
drying time, and the need to give some thought at an early stage to fixing into the finished
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