It's weeks since I wrote that we were starting to finish the insulation of the staircase tower. Since then the job has been finished, but what with spending all my time in the car park at Chenonceau I really have not had time to write about the next steps.
After putting the framework in place, Stéphane first applied a very rough 50/50 mixture of cement and chaux (lime) with enough water to hold it together. This was to give the chaux chanvre something to grip onto and was applied from a distance by being thrown at the wall. It wasn't a thick layer, nor did it give complete coverage.
50 litres of chopped chanvre (hemp)
25 litres of chaux aérienne (CAEB 90)
25 litres water
see how messy the process is.
By this stage there was gunk everywhere.
½ bucket chaux aérienne
½ bucket fine (0-2mm) white sand
1 bucket chanvre
½ bucket water (more or less)
This was of a more traditional gloopiness, more like cement, and trowelled into place. This involves plenty of muscle power as you are trying to get a slightly glazed looking finish.
You can now start to see the final effect.