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Value of Thermofoil: Does the orientation and position of the reflective foil influence the R-value?

April 26, 2017foil influence Orientation position R-Value reflective thermofoil value

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Value of Thermofoil: Does the orientation and position of the reflective foil influence the R-value?

1 Answer

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10 Posted

Yes, the R-value of reflective foil depends on the orientation of the foil, ie. horizontal or vertical and the direction of heat flow. Air spaces of 20mm minimum are required for reflective foil to be effective. Foil laid over a ceiling lining with insulation on top has no R-value, it acts only as a vapour barrier.