Do I need air vents in my soffits?
Subsequently, one may also ask, are soffit vents necessary?
Static, roof-line, vents are effective for ventilation but generally aren't recommended due to issues with leaks. Soffit vents may leave air trapped at the top of your attic. Most effective ventilation uses a ridge-and-soffit continuous ventilation system, but even these designs can vary from roof to roof.
Also, do all houses have soffit vents?
In short the answer is no for most houses as shown in this picture; you see that open space – well that allows air to flow from one bay to another. Now if those rafter tails are blocked off or you used I-Joists, then the answer is that yes you need soffit venting in each bay.
Soffit helps your home achieve the right amount of airflow circulation without allowing moisture to accumulate around the beams and interior elements of your home. This ventilation is achieved through mini-holes or vents in the soffit. These vents make your home breathable and provide air circulation to your attic.