Graphite eps

[User___removed]

I looked at a job yesterday and the customer said they had a quote from a green deal installer and they recommend using 60mm graphite eps as it has the same valve as a standard white 90mm eps board
What's your thoughts on this?
Cheers

 

[themucky1]

Grey eps does have a better u value than white eps but the 90mm white isn't sufficient to get the u value to what it should be which is roughly 0.037 I think to get that with white you would need around 120mm, the reason the original guy said that as 60mm is cheaper than 90mm and White eps is generally cheaper than grey