I'm in the trade but can i ask what insulation you prefer?

Both types have their advantages, however where space will permit we tend to use kingspan or celotex as it can be easily cut to the right size and shape to fit between timber work. Where space/access is restricted we would use the foils. It is worth asking your local building control officer if they prefer/recommend the use of one rather than the other on each project. Hope this helps Artro Property Services

hi you need to acheive the u value ,all different ways ,however 200mm rafters,180mm quilt and super quilt this has a u value of 0.14 well under yours prestigehomeimprovements

Multifoils are great for solid wall insulation, behind timber framing, but although thin you need to carefully consider u-values, but also easy to fix up. If you have the room you cant beat celotex (bit cheaper in south east compared to kingspan)