Performance of hempcrete in a building - The Hempcrete Topic: Designing and Building with Hemp-lime - page 144

300mm walls of cast-in-situ hempcrete easily achieve the
thermal performance required for a new building.
To date, attempts to reproduce this hygrothermal behaviour in currently available models
used to predict a building's energy use have proved problematic, which is unfortunate,
since it may account for an underestimation of hempcrete's actual thermal performance.
Work is currently under way to integrate this dynamic behaviour into commonly used mod-
elling software, so that the full scope of hempcrete's complex thermal performance can be
demonstrated.
The fact that cast-in-situ hempcrete is cast in a continuous monolithic slab means that, once
sealed with render finishes, it has a unique advantage in achieving good airtightness (in-
situ tests have shown excellent airtightness levels, according to all sources) and reducing