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Energy Efficiency

One of the leading reasons to choose strawbales over other building materials is their high level of energy-efficiency. This is due to the exceptional insulating properties of the bales.

Insulation values are commonly expressed as R-values. Please see comparism of R-values between conventional wall systems and strawbale wall systems in the table below:

Construction R-value Comments
conventional wall system 2.0 to 3.5 depending on climatic conditions, building code regulations, building material and type of insulation
strawbale walls 5.5 to 8.5 depending on widths, type, quality and density of strawbales and on how the bales are stacked

Combined with a well-designed passive solar system strawbale houses require very little energy to keep warm in winter and cool in summer.

Note: In most American literature regarding straw bale building, the R-values for strawbale walls are stated to be between R-30 and R-48. This is misleading as they use a different calculation system for their insulation values compared to the system used in Australia.