Solar kiln - with solar panel and revised for correct air circulation

Step 5: Insulating the walls

I used two (2) kinds of insulation on the walls.  Similar to the floor, I cut rectangles of styrofoam and placed them within the wall studs and pushed up against the exterior siding.  Next, I placed a layer of Reflectix bubble warp insulation around the entire interior of the frame.  I was attempting to create a dead air space between the styrofoam and bubble wrap.  The seams of the bubble wrap were sealed with aluminum-backed tape and stapled in place.  Excessive, Excessive, Excessive.

Since bubble wrap can be punctured, I installed some recycled cedar siding on the inside walls where the drying lumber is placed.  The cedar siding protects the insulation during wood handling because you will invariably bump the walls.