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The value for the thermal factor, Ct, used in the calculation of ρf shall be determined from Table 1608.3.2.

TABLE 1608.3.2 THERMAL FACTOR, Ct

THERMAL CONDITIONa Ct
All structures except as indicated below 1.0
Structures kept just above freezing and others with cold,
ventilated roofs in which the thermal resistance (R-value)
between the ventilated space and the heated space exceeds 25h • ft2 • °F/Btu
1.1
Unheated structures 1.2
Continuously heated greenhousesb with a roof having a thermal resistance (R-value) less than 2.0h • ft2 •°F/Btu 0.85

For SI: 1 h•ft2• °F/Btu = 0.176m2•K/W.
a. The thermal condition shall be representative of the anticipated conditions during winters for the life of the structure.
b. A continuously heated greenhouse shall mean a greenhouse with a constantly maintained interior temperature of 50°F or more during winter months. Such greenhouse shall also have a maintenance attendant on duty at all times or a temperature alarm system to provide warning in the event of a heating system failure.

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