Monoblock frames are designed for building windows that are installed in the insulation layer. The wide range of Monoblock frames allows their appropriate selection depending on the thickness of the insulation. A special shelf (window sill) located from the outer side of the frame in a aesthetic manner masks the insulation around the perimeter of the window avoiding the formation of thermal bridges. The inner rebate of the Monoblock frame ensures aesthetic installation from the inside of the room without the need of gypsum processing.