Onoff Posted April 28, 2018 Share Posted April 28, 2018 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? Link to comment Share on other sites More sharing options...
A_L Posted April 28, 2018 Share Posted April 28, 2018 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 1 Link to comment Share on other sites More sharing options...
Onoff Posted April 28, 2018 Author Share Posted April 28, 2018 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! Link to comment Share on other sites More sharing options...
Temp Posted April 29, 2018 Share Posted April 29, 2018 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. Link to comment Share on other sites More sharing options...
Onoff Posted April 29, 2018 Author Share Posted April 29, 2018 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!!! Link to comment Share on other sites More sharing options...
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