Rebuilt masonry window openings fitted with Passivhaus Institut Certified Munster Joinery triple paned windows. Inswing casement tilt and turn. ~ R 8. Thermal bridge free. Seven point multi-lock. SHGC (Solar Heat Gain Coefficient) ~ .60. More energy is gained than lost. Insulated Frames. Super Quiet. Lamilux skylight. Airtight construction and installation techniques.