Work started this week laying the Limecrete base for the floor. As I wrote previously, Limecrete is a concrete alternative that allows water vapour to escape and not cause damage to the walls.
The Limecrete base is laid on top of a bed of what look like gas BBQ briquettes. They are made from foamed recycled glass – very light and full of air bubbles. This layer acts as a thermal barrier, keeping the heat from the underfloor heating system inside the building rather than warming the earthworms below.
Mixing and laying the Limecrete is a rather laborious process because the it has to be mixed on-site in batches. So mixing and laying will go well into next week.
Our heating engineers were also here last week and have installed the two new boilers, along with radiators in the WCs. The radiators in the schoolroom will be installed and the system commissioned this coming week (half term).