No Vent In Attic

Typically you would have a gable vent on each end of the attic.

No vent in attic.

This creates a natural air flow by drawing in the air from outside pushing it up and out through the vent at the top of the house. This negative pressure causes the vent to open and let in enough air to relieve the pressure. A combination of air sealing and insulating the attic floor while providing ventilation considerably reduces the potential for condensation as warm moist air is less likely to enter the space and condense on cold surfaces. Normal vented air likes to enter the attic lower down near the bottom third of the attic and as it passes through it will exit higher up near the top third of the attic space.

For proper ventilation it isn t enough for air to simply get into your attic. Studor vents are a very popular kind of air admittance valve that works really well. Problems when roof has no overhang. Too often mechanical ventilation ducts from bathrooms kitchens or laundry rooms deposit warm moist air into the attic instead of outside the building envelope.

If you re wondering how studor vents work after the toilet is flushed the water flows down the drain resulting in negative pressure. The most common way to add ventilation to an attic is by installing air intakes in the soffits and putting an outlet at the gable of the house. Gable vents may circulate air through only a small percentage of your attic. How to vent an attic with no eaves the function of soffit vents.

Static roof line vents are effective for ventilation but generally aren t recommended due to issues with leaks. Without baffles blinders that prevent outside air from crossing over the vent a ridge vent may create almost no ventilation at all.