Hemcrete^® is both a good insulator and has thermal inertia (similar to thermal mass).
Buildings created from Hemcrete^® have very low or zero energy in use.

The U values for walls depend on the Hemcrete^® wall thickness for example for standard mix:

               A 200 mm wall has a U value of 0.3
               A 300 mm wall has a U value of 0.2
               A 400 mm wall has a U value of 0.15

Advice on U values and wall thicknesses can be downloaded here

Air tightness is also critical in creating energy efficient buildings and meeting the requirements of the
code for sustainable homes. Hemcrete^® is a single cast product with no layers, cavities or joints and
so is inherently air tight.

Hemcrete^® based buildings regularly achieve air tightness below 2.0 m³/m²/hr@ 50 Pa a summary of
air permeability results achieved in Hemcrete^® buildings can be downloaded here

The CPD presentation on the thermal performance of Hemcrete^®can be downloaded here

For an extensive study of the thermal performance of Hemcrete^® presented by Ian Mawditt
of Building Sciences at Ecobuild 2008 download  the presentation here