Work on the roof was finished today in preparation of the HVAC people coming in tomorrow to set up ducting. The exterior floating wall was also worked on, using 1" drywall screws to prevent contact between the screw and the inner layer of sheetrock. Tomorrow they plan on finishing the interior insulation and starting work on the HVAC system.

Dust counts remain normal, although there were a few brief periods, no longer than 5 minutes, where counts exceeded 20,000 at 0.5 microns. This does not appear to have affected the cleaning by HAM12.