Example Calculation Using the TIMA Formula

Assume a metal building roof structure with the following characteristics:

Length of Building Section = 100 feet

Number of Purlins = 21 purlins

Fastener Population per foot of Purlin = 1 per foot hr-ft2°F

Sum of Air Film R-Values = 0.61 + 0.17 = 0.78 Insulation thickness

= 5 inches

Table 9.7 Roof insulation installed compressed over-the-purlin5.

Unbridged R-Value

Nominal Thickness (inches)

R-Value 2' O.C.

R-Value 3' O.C.

R-Value 4' O.C.

R-Value 5' O.C.

R-Value 6' O.C.

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