Insulative Values for Straw Bale Construction Emily Hartz and Michael McDonald.

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Presentation transcript:

Insulative Values for Straw Bale Construction Emily Hartz and Michael McDonald

Variables Affecting Straw Bale Efficiency Moisture Large air gaps Installation Thickness Type of straw Interior walls Roof efficiency Straw orientation

Graphical Comparison of R-Values Table 1. Straw Bale R-values Joe McCabeSandia LabORNLCEC ORNL Test procedure Hot plate, single bale Thermal probe, single bale Hot box, full wall Approved values Hot box, full wall Test date Oct. 1996Dec. 1996May-97Feb Type of strawWheatNot listedWheatAnyRiceWheat Type of bale3-string, 23 in2-string, 18 in 3-string, 23 in 2-string, 19 in Moisture content8.40%Not listed 20%11%13% Density lb/ft Not listed76.78 R-value/ in Source: Commins and Stone, "Tested R-value for Straw Bale Walls and Performance Modeling for Straw Bale Homes," 1998 ACEEE Summer Study on Energy Efficiency in Buildings Proceedings.

Conclusions Ultimately it is difficult to compare R-values in straw bale construction because of the many variables affecting their efficiency. R- values vary from R 3.0 per inch to R 0.94 per inch depending on construction and the method of R-value measurement. R-value has also been known to decrease with time as the material degrades.