EWI vs thermal render advice

[dazzler9000]

I've been toying with the idea of getting 100mm EPS EWI on my two solid walls for a while now. My wife is concerned about the recessed windows, and I have to admit, this does bother me a bit.

This evening, I discovered thermal render systems from Proofshield, where they claim to have some thermal properties. Just wondered what anyone's thoughts were.

I find getting valid specs hard, as some display U and some R values....
I've attached an image from their PDF, anyone know if these values stack up? I appreciate it won't warm the house like EPS, but it should be cheaper, and my windows won't be tunnelled. 40mm seems a sensible thickness. According to the chart, that's a 500% increase to the R value.

https://proofshield.co.uk/wp-content/uploads/2024/10/Thermo-Silicone-A4-new.pdf

 

[endecotp]

The “untreated wall” numbers that that table look wrong. I’d expect something around 0.5 - 0.6. The benefit of their product looks less impressive in that case….

I find these numbers are easiest to think about if you convert them to Watts and then to £. “X times better” is less meaningful than “Saves £ per year”, right?

Note that PIR is significantly better than EPS.