If a window isn’t installed properly, it won’t matter how energy efficient it is.
Installing windows on a building with exterior insulation isn’t easy. The window and the rigid foam or mineral wool need to line up on the same plane. This is the only way to have good drainage, proper cladding attachment, and to prevent compression of the insulation. Rough openings have always been the weakest spot on any building for air and water infiltration. “Bumping” the window out only makes it more difficult to achieve a good air and water seal.
ThermalBuck solves this challenge by extending the mounting point to create a flush plane for cladding. It also insulates the rough opening, limiting thermal bridging around windows & doors.