I have about 1600 SF of roof, there are four existing box vents, and soffit vents on the eaves, which extend out about two feet from the house. Doing some research it seems as if the attic is "undervented" if you will. I'm also planning to install a whole house fan to help with cooling our main floor in the summer and want to make sure I have enough venting for that as well. In total, my calculation indicates about 300 square inches of net free air, which I would need to increase to about 500 for the whole house fan.
Henceforth the desire to add more roof and soffit vents. I'm just wondering what the correct procedure is to install a couple box vents on this type of roof, and if roof cement is adequate, and if so, what type of roof cement.