Most houses built before the 1970s were designed with very small, narrow windows that make the interior space feel dark and poorly lit, and many modern homeowners want to expand these small window openings to let in much more natural daylight. After you cut and enlarge the new larger window opening in the old masonry wall, the leftover exposed raw wall edges can be hard to finish neatly with traditional plaster. Using custom cut EPS Cement Sandwich Panel pieces, you can create perfectly flat, smooth new window reveals and surrounds around your new larger window, that are perfectly straight and ready to paint in almost no time. The panel’s built in insulation also eliminates the cold thermal bridge that would otherwise exist around the new enlarged window opening, preventing condensation and mold growth from forming on the new window edges during cold winter months. Unlike traditional plaster that takes days to dry and cure, the EPS Cement Sandwich Panel window surrounds are ready for final finishing just hours after installation. This renovation lets you completely transform the look and feel of your old room, making it feel far brighter, more open, and much more modern, without the mess and long drying time of traditional plaster work.