Open Access
Table 1
Summary of measured R and C-values of plastered straw bale walls.
| Study | Procedure | Wall thickness [m] | Orientation of fibres | C-value [W/ m2K] | Comments |
|---|---|---|---|---|---|
| Watts (1995) | Heat flow monitoring | 0.467 | Parallel | 0.2 | – |
| Christian (1996) | Guarded hot box, full wall, to ASTM C236 | 0.47 | Parallel | 0.33 | Deficiencies on the sample have been noted. The test was conducted again in 1998 |
| Stone (1997) | Guarded hot box, full wall, to ASTM C236 | n/a | Perpendicular | 0.172 | Not reliable results: the test was stuffed with loose straw to cover gaps and the was performed before the plaster completely dried off |
| 0.584 | Parallel | 0.218 | |||
| Christian (1998) | Guarded hot box, full wall, to ASTM C236 | 0.483 | Parallel | 0.206 | – |
| Wimmer (2000) | n/a | 0.42 | n/a | 0.12 | Method and fibres orientation in unknown |
| Andersen (2001) | Hot box, full wall, to ISO 8990 | 0.461 | Parallel | 0.203 | Problems occurred during the tests. Values cannot be reliable |
| 0.417 | Perpendicular | 0.196 |
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