Insulation Air Baffles
A baffle serves two purposes: it provides stability and support. It can also help prevent conditioned humidity from escaping to the surrounding area. Installing a SmartBaffle to your home will decrease your energy use, keep drafts out in winter, and improve your indoor quality. In most cases, insulation is installed without any insulation on roof deck. This allows cold atic air to get into the insulation where it can. This is an expensive way to lose heat and is extremely costly. Insulation not only increases the Rvalue but also adds an insulation layer which reduces airflow upwards by as much as 75%
A Soffit vent is a ventilation opening located at the bottom of a roof on the outside of a building. A soffit generally directs airflow from the house to the exterior, over the ground, and over some barrier such as turf or slab. Some soffits have screens or insulation to minimize wind-driven rainwater intrusion, while some have insulation only for convenience since insulation can also be provided in a properly insulated attic.
Bob Vila explains that attics are equipped with intake vents that allow in cool air. Hot air exhaust vents that vent hot air at the roof's peak let out hot. The intake vents may be placed in the soffit in one continuous piece or separated by vents every few feet. The vents on gable roofs will be closer to the peak of their gable.