morning, we have a nice garden room in our plans where the corner of it opens up. we're finalising quotes for windows and doors and one manufacturer has said that they don't offer that sort of glass to glass corner openings as, in their experience, they cannot get them airtight, secure and watertight. but Internorm has said that they can do it and I've been supplied photos of one of their clients sites showing it being done. (not sure if I can/should post photos of a site without the o