I ordered two roof light windows with flashing kits on-line. It was only after taking delivery that it was clear that installation works better with insulation collar and felt apron but neither of these are shown as optional items on the website. Only option is window blinds. Had to order insulation collar and felt apron by phone and this website omission has delayed installation of roof lights by over a month. Yet to receive collar and apron - annoying and most disappointing.
