Fastener Insulation Outer Corrugated Figure 5.3-3 Detail of Heat Transfer From a Metal Surface to a 5.3.3.2.2 For envelope assemblies containing Non-Metal Framing, the U¡ shall be determined from one of the laboratory or field test measurements specified in Section 5.1.5 or from the ASHRAE series-parallel method. Formulas in Chapter 23, page 23.2 of the ASHRAE Handbook, 1985 Fundamentals Volume, shall be used for these calculations. 5.3.3.3 The thermal transmittance of fenestration assemblies shall be corrected to account for the presence of sash, frames, edge effects and spacers in multiple-glazed units. If thermal transmittances of sash and frames are known, Equation 5.3-1 shall be used, otherwise the thermal transmittance offenestration assemblies shall be calculated as follows: A-area of ith fenestration assembly 1=numerical subscript (1,2,...n) refers to each of the various fenestration assemblies present in the wall n=the number of fenestration assemblies in the wall assembly. Uo the overall thermal transmittance of the fenestration assembly, including sash and frames, Btu/h ft2°F. U, the thermal transmittance of the central area of the fenestration excluding edge effects, spacers in multiple-glazed units, and the sash and frame, Btu/h ft2°F. F=framing adjustment factor for sash, frames, etc. A the area of all fenestration including glazed portions, sash, frames, etc. 5.3.3.3.1 Values for U, shall be the winter value obtained from the glazing manufacturer's test data or from Table 13 or Figure 14 of Chapter 27 of the ASHRAE Handbook, 1985 Fundamentals Volume. Values for F, shall be obtained from the frame manufacturer's test data or from the average adjustment factor for a particular product in Table 13, Part C, in Chapter 27 of the ASHRAE Handbook, 1985 Fundamentals Volume. For glass products with a U value of 0.45 or less, use the F, for triple insulated glazing. Alternatively, values of the U°F product may be used from manufacturer's test data for open window and frame assemblies tested as a unit provided that the tests referenced edge-effects and windspeed are accounted for winter tested U-values are used. 5.3.4 Gross Area of Envelope Components 5.3.4.1 The gross area of a roof assembly consists of the total surface of the roof assembly exposed to outside air or unconditioned spaces. The roof assembly shall include all roof/ceiling components through which heat may flow between indoor and outdoor environments including skylight surfaces, but excluding service openings. 5.3.4.1.1 For thermal transmittance purposes, when return air ceiling plenums are employed, the roof/ceiling assembly shall not include the thermal resistance of the ceiling, or the plenum space, as part of the total thermal resistance of the assembly. 5.3.4.2 The gross area of a floor assembly over outside or unconditioned space consists of the total surface of the floor assembly exposed to the outside air or an unconditioned space. The floor assembly shall include all floor components through which heat may flow between indoor and outdoor or unconditioned space environments. 5.3.4.3 The gross area of exterior walls enclosing a heated or cooled space is measured on the exterior and consists of the opaque wall including between floor spandrels, peripheral edges of flooring, window areas including sash and door areas, but excluding vents, grilles and pipes. 5.3.5 Shading Coefficients 5.3.5.1 The Shading Coefficient (SC) for fenestration shall be obtained from Chapter 27 of the ASHRAE Handbook, |