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To transform an RSI Value into an R-Value, you should multiply the RSI Value by 5.678. Conversely, to change an R-Value into an RSI Value, you need to divide the R-Value by 5.678
RSI, in the context of thermal resistance, stands for “R-value SI,” where “SI” refers to the International System of Units. The R-value measures the thermal resistance of a material or assembly of materials (like insulation in a building). It quantifies how well a material can resist heat flow. The higher the R-value, the greater the insulation’s effectiveness. The “SI” designation indicates that the R-value is measured in metric units, specifically square meter Kelvin per Watt (m²·K/W). This is in contrast to the R-value used in the United States, which is typically measured in square feet Fahrenheit hours per British thermal unit (ft²·°F·h/Btu).
In a different context, especially in finance, RSI stands for “Relative Strength Index,” which is a momentum oscillator used in technical analysis that measures the speed and change of price movements. The RSI oscillates between zero and 100 and is considered overbought when above 70 and oversold when below 30. This definition, however, does not seem to apply to your question regarding conversion between RSI Value and R-Value, which pertains to thermal resistance.
R value of spray foam insulation chart
RSI – R value
R5 – 0,88 RSI
R10 – 1,76 RSI
R12 – 2,11 RSI
R18 – 3,17 RSI
R20 – 3,52 RSI
R22 – 3,87 RSI
R24 – 4,23 RSI
R31 – 5,46 RSI
R40 – 7,04 RSI
R50 – 8,81 RSI
R60 – 10,57 RSI
1 Inch 5.75 per inch R5.7
2 Inches 5.7R per inch R11.4
3 Inches 5.8R per inch R17.4
4 Inches 5.9R per inch R23.6
5 Inches 6.0R per inch R30
6 Inches 6.1R per inch R36.6
7 Inches 6.2R per inch R43.4
8 Inches 6.3R per inch R50.4