November 6
We purchased 2 rolls of foil-faced cotton insulation from Bonded Logic. This will be our first (outermost) layer of insulation. The solar insolation in the Southwestern U.S. will easily turn our steel bus into an oven; the foil face on the insulation will serve as a radiant barrier.
The next layer will probably be 2 layers of 1/2" rigid foam. Why not just a 1" layer? Because the insulation will have to bend to accommodate the curve in the bus ceiling. 1" foam board will certainly break, but 1/2" foam has just enough flex to do the job.
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Bonded Logic Insulator installed between bus ribs.
Yes, there is a foil face on both sides. You can order single or double foil faces.
The insulation is very easy to cut with normal shears, and does not require the user to wear protective clothing. Cotton batt insulation from Bonded Logic comes in 2 sizes: 3/8" and 3.5". Our wall thickness will be around 2 inches total, so we're going to make a sandwich using cotton insulation and foam board.