Building detail: these double glazed doors have been imported from Germany via Timber Tech,  for the simple reason that to obtain a similar quality product from the Australian equivalent would have cost us double the price, making it impossible for us to use a high quality glazing product on this build. As windows and doors are weak spots of the building envelope: a great deal of heat is lost or gained, it was important to us to use a glazing option that diminished our long term energy use. Paarhammer produce an excellent product, here in Australia. We have used them on a smaller project and have been extremely happy. 