SEDL / STP / STP789-EB / STP29459S

Thermal Performance of Insulated Metal Building Roof Deck Constructions

Miller, RG
Research Associate and Senior Research Associate, Jim Walter Research Corporation, St. Petersburg, Fla.

Sherman, M
Research Associate and Senior Research Associate, Jim Walter Research Corporation, St. Petersburg, Fla.

Pages: 16    Published: Jan 1983

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Abstract

System thermal resistance (R) values were measured in full-scale guarded hot box tests, in accordance with ASTM Test for Thermal Conductance and Transmittance of Built-Up Sections by Means of the Guarded Hot Box (C 236), on a series of ten insulated metal building roof deck constructions. Orientation of the hot box was horizontal, with heat flow upward for the test constructions with cavities, and heat flow downward for the test constructions without cavities, that is, those with an exposed steel purlin. Mean temperature in each insulated construction test was approximately 4.4°C (40°F). System R-values were calculated for certain of these insulated constructions by means of the ASHRAE Zone Method. This method may be used for an insulation system containing a highly conductive element, such as a steel purlin. Results of the comparisons between the measured R-values and the zone method calculated R-values are reported in this paper.