Patio doors are mainly made from UPVC plastic, and will have a sliding action. The finish might be white, light or dark timber effect. Additionally, these doors can be made of timber or aluminium. Some patio doors will have more composite opening arrangements than the simple sliding action. For instance, some could tilt for ventilation, and also hinge outward for opening. Doors could also have a concertina action, with the doors naturally opening outward. The benefit of this is to provide a full clear opening to terrace or garden. While choosing these doors, it is essential to select one that is suitable for the area's weather and climate. Harsh winters will need thermally insulated glass. Moreover, special coatings can be applied to the glass to aid limiting the passage of heat. This helps in keeping rooms cooler during the summer months and warmer during the winter. It's also significant to choose high-quality sealing material and to make sure that the weather stripping is much durable, as it protects your room and home from the elements. It is also vital to make sure that any screen or pest doors are sealed tightly as well.