Can an attic have too much ventilation?

Mixing different exhaust vent types can short-circuit airflow. Balanced intake and exhaust matters more than quantity.

Does ventilation replace insulation?

No. They work together: insulation keeps heat in the house, ventilation keeps the attic cold and dry.

Attic Ventilation & Roof Vents in Madison, WI

A well-ventilated attic stays close to the outdoor temperature. In winter that keeps the roof deck cold so snow melts evenly; in summer it lets heat escape so shingles last longer.

Roof repairs, replacements and ice dams

Madison and the surrounding Dane County communities

Get a quote before any work starts

How it works

Cool air enters through vents in the soffits at the eaves and leaves through vents at or near the ridge. A steady flow carries moisture and heat out of the attic.

Signs of a problem

Frost on nail tips in winter, ice dams, a stuffy, very hot attic in summer, rusty nails, mould on the decking and shingles that age early.

Blocked soffits

Insulation pushed into the eaves often blocks intake vents. Foam or cardboard baffles hold a channel open so air can reach the attic.

Bath and kitchen fans

Fans should vent outside, not into the attic. Warm, damp air dumped into a cold attic turns to frost and then to water.

Air sealing comes first

Ventilation works best when warm air from the house isn't leaking into the attic around lights, pipes, chimneys and the hatch.

Older Madison homes

Many older homes near the lakes have small attics, knee walls and few vents. A roofer can suggest options that suit the roof shape.

Do it with the roof

A replacement is the easiest time to add ridge vents and fix intake. See roof replacement.

Get it checked

Tell the roofer about frost, ice dams or a hot upstairs. Send a request and a roofer will get in touch.

Powered vents

Attic fans can help in some homes, but they can also pull conditioned air from the house through ceiling gaps. A roofer will usually look at passive intake and ridge venting first, then suggest a fan only where it makes sense.

Ventilation and warranties

Many shingle manufacturers require adequate attic ventilation as a condition of their warranty. Ask the roofer to confirm your attic meets the requirement when you replace the roof.