Over the last couple of weeks I finished with the cellulose insulation, insulated the loft knee walls, cleaned all the dust out of the cabin, and installed the mounting rails for the solar panels.

The only areas needing blown insulation that remained were the areas under the three first floor windows, and an area in a bathroom wall cavity where there was some blocking holding the shower controls. I drilled a two inch hole in the top of each cavity and blew in the cellulose using a two inch hose. I capped the holes with spray foam which I'll cover later with joint compound. The whole process worked well and only took a couple of hours once I had the hoses on the blower set up correctly.

I added fiberglass batt insulation to the knee walls in the loft, making sure there was no gap between the cellulose in the lower wall and the batts up top.

With the cellulose insulation finished, I spent about eight hours vacuuming off the layer of dust coating every inch of every part of the cabin. It took so long because of all the tools and supplies stored in the cabin that had to be cleaned individually. When finished, the cabin was definitely a more comfortable working environment.

Finally, I installed two extruded alumninum mounting rails on the roof which will eventually hold the solar panels. I needed to install the rails prior to closing off the loft ceiling so I'd be able to access the bolts securing the rails from underneath the roof. Each rail is secured using three aluminum L-brackets with a galvanized bolt running through the metal roofing, 2x4 purlin, and sheathing.

It was painful having to drill holes in my pristine metal roof but I sealed the holes using a layer of butyl tape under the L-brackets and a generous amount of silicon caulk around the bolts themselves. On the inside, I used some spray foam to fill the area around the protruding bolts.