Preparation for Hebel

Yesterday we noticed the hebel had been delivered to site and that various works had been done in preparation for installing the hebel. A material (like foil, could be insulation) is attached to the house frame to create the sensation of walls surrounding the house. The material is silver from the inside, and green (branded Carter Grange) from the outside. We're told the guys will start installing the hebel tomorrow and that ground floor is done first, then scaffolding erected before the hebel is installed to the first floor. It takes about 3 weeks to complete the hebel. We're interested to see how it's installed.