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R-VALUES THAT ARE MADE-TO-MEASURE.

Author(s) : TRETHOWEN H. A.

Summary

CALCULATED R-VALUES FOR A VARIETY OF TIMBER-FRAMED, CONCRETE MASONRY, AND PANEL CONSTRUCTIONS HAVE BEEN COMPARED TO MEASURED VALUES. FROM THIS DATA IT IS CONCLUDED THAT R-VALUES CAN BE REALISTICALLY PREDICTED BY SIMPLE FORMULAE WITH CARE AND SOUND JUDGMENT. THE PRINCIPAL FACTORS CAUSING R-VALUES TO VARY FROM IDEAL ARE ARGUED TO BE THERMAL BRIDGING, GAPS IN INSULANT, AND MOISTURE. THERMAL BRIDGING IS SHOWN TO REDUCE REALIZED R-VALUES BY UP TO 50%. IN MANY CASES THIS LOSS CAN BE LARGELY AVOIDED BY USING THERMAL BREAKS.

Details

  • Original title: R-VALUES THAT ARE MADE-TO-MEASURE.
  • Record ID : 1987-0249
  • Languages: English
  • Publication date: 1985
  • Source: Source: ASHRAE Trans.
    vol. 91; n. 2B; 36-48; 8 fig.; 2 tabl.; 10 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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