April 28, 20188 yr 25mm EPS vs 25mm PIR: The approx thermal conductivity is .038W/mK for the EPS & .023W/mK for the PIR. Is it really as simple as the PIR is nearly twice as good as the EPS at this thickness?
April 28, 20188 yr One way to look at is to say 38mm of EPS has the same insulating effect as 23mm of PIR, so not quite twice as good. The proportions hold for other thicknesses
April 28, 20188 yr Author 34 minutes ago, A_L said: One way to look at is to say 38mm of EPS has the same insulating effect as 23mm of PIR, so not quite twice as good. The proportions hold for other thicknesses Great tip!
April 29, 20188 yr Some people say that the thermal properties of PIR degrade over time but as I understand it the value quoted is the degraded value so actually PIR is slightly better than the quoted value when new.
April 29, 20188 yr Author 47 minutes ago, Temp said: Some people say that the thermal properties of PIR degrade over time but as I understand it the value quoted is the degraded value so actually PIR is slightly better than the quoted value when new. Bought one sheet of 25mm at Wickes... £30!!!
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