There are many standard elements to proper roofing construction, but something that can greatly improve the ventilation of the area is the installation of roof fans. If your home is a few decades old and you're entertaining the idea of Virginia roof replacement, installing roof fans with the new construction can add years to the life of your new roof. Not every home has adequate ventilation in the roof area and a roof technician can likely tell you whether your roof has enough fans or whether more should be installed. Fans are essential for keeping the proper level of humidity around the roof.