Why do Attics need Ventilation?
A. The attic, being an enclosed area, can be prone to moisture buildup. If there is no way for this moisture to evaporate, the roof and attic structure can be affected and long term damage created. It would also be possible for mold to grow in the attic and possibly adversely affecting the occupants.
B. Heat buildup in the attic will also decrease the life of the shingles and underlayment (plywood).
C. Proper ventilation is necessary for your whole house fan to run efficiently! Improper ventilation will strain your whole house fan and reduce its life. It will take much longer to cool down your home. Also, because we are pressurizing the attic with the air drawn out of the house and blown into the attic, hot, dirty air will be blown back into your home through light and switch boxes located in the ceiling and walls.