Back home, I inspected the contents & instructions. Velux instructions consist of coloured diagrams with numbers and arrows. Familiarity with Ikea type instructions is probably an advantage. The flashing kit has its own set of similar instructions. Both sets are designed for the situation where you are building a new roof. I searched the box and the Velux website, but I didn’t find any instructions for retro-fitting a new Velux window to an existing roof. Please! (Actually, for architects, the website contains loads of stuff to aid specification).
What I did find on the internet was Simon Nuttal’s home site which contains a very helpful ” Loft Window” description of making a hole in an existing roof and installing a Velux window. Thank you Simon.
With the Velux frame propped up on its side and held by an assistant, I pressed in the little locking buttons and rotated the window around until it came free and then lifted it out (carefully, because it’s heavy). I also removed a couple of fragile-looking pieces of facia trim from the window part, so they would not be damaged when the window was moved to the attic. (How was I going to do this?) Having removed the window, the Velux frame could be lifted easily by one person. The separate window was still heavy!
There were two people who I cursed roundly a number of times while I installed the window:
Anything the size of the new window would have to be hauled up the front of the house. I set about removing the old window in order to make a big enough hole to pass the new parts through. This wasn’t difficult. The picture shows the opening after part of the frame was simply lifted out by hand!
The other part followed just as easily.