5.0 Insulation

5.1
All insulation shall be minimum 4" thick rigid polyurethane foam chemically bonded to the interior and exterior fiberglass to form a one-piece structure.

5.2
The thermal conductivity (K) shall not exceed .125 (BTU's/in/sq. ft./hr. F). The thermal resistance (R) factor shall not be less than 32.

5.3
The insulation shall be U.L. Class I having a flame spread of not more than 25, fuel contributed of 0, and smoke developed of 170.

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