Why is it important to install baffles in the attic when insulating above the ceiling?

• A. Baffles keep ventilation channels open, prevent insulation from blocking soffit intake, and reduce ice damming and moisture buildup.
• B. Baffles are decorative.
• C. Baffles increase heat loss.
• D. Baffles are only needed for radiators.

Answer: (A)

The key idea is keeping attic ventilation working when insulation sits above the ceiling. Baffles create a clear, unobstructed air channel from the soffits up to the roofline, so fresh outdoor air can circulate under the roof deck. This prevents insulation from sealing off the intake vents and traps moist, warm air in the attic. With proper ventilation, moisture doesn’t condense on the roof deck or inside the insulation, reducing mold growth and wood rot and helping the insulation perform as intended. In winter, good airflow also minimizes ice damming by keeping the roof deck cooler and preventing warm, melted snow from refreezing at the eaves.

Baffles aren’t decorative, and they don’t cause more heat loss; they actually protect ventilation and insulation performance. They’re not a feature for radiators.