Hi again. Do any of you fellas know anything about SIPS I am going to build an extension at the back of the house like a knock through going into a 6m x 4m kitchen diner with a flat roff. I want it up quick and was thinking about SIPS but when I have read up on them they seem to need two skins. But I have come across Super SIPS that say they only need one which wold be great. And they can be used for the roof as well. Looking at normal SIPS they seem to work out about the same price but are much quicker and more thermally efficient. Has anyone built with them or know much about them? Pros and Cons would be much appreciated. Thanks lads:RpS_thumbup: