To keep the classic school bus feel, we are keeping most of the windows, and therefore we wanted to insulate as much of the bus as we could because the original windows are not very energy efficient. Matt and I both stand a few inches under 6 feet so we figured we have room to play with. We went with 1.5" polyiso foil faced foam board, giving us an R value of 9.3. The foam has a minimum compressive strength of 16 lbs per square inch. It's moisture, temperature, rot, and air resistant. We used Loctite Pl Proline Adhesive to bond the foam to the freshly swept metal floor of the bus and Georgia Pacific Forcefield Seam Tape to tape the foam pieces together. Since we went with a frameless floor and are applying our subfloor directly over the foam, we wanted it to be sufficient to withstand any live or dead loads that we would have in our bus. So we used 3/4" tongue and groove plywood as the subfloor. We used the same adhesive for bonding the plywood to the foam as we did for the foam to the metal floor. We used wedge blocks underneath the chair rail to press the plywood down along with some vertical 2 x 3's from roof to subfloor to ensure that the subfloor was lying flat and bonding well to the foam.
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