Bifold Door in EWI

[thomas]

What is the best way to install a bifold foor in a solid wall with 200mm of external wall insulation?

I want to minimise thermal bridging (though the bifold door is a massive bridge) and install the door in the insulation, this may mean I get get away with standard size cills. But what's the best way to do this?

Do you think some eps 300 would be strong enough to hold the door if I make a frame up with it? Or should I use timber or steel hidden in the insulation?

[thomas]

This is the stuff I remember looking at:

http://www.greenbuildingstore.co.uk/products/compacfoam-200/

It's not cheap at £26/m so is there an alternative?

If I do use timber do I just rebate the back of the eps ewi?