Symptoms
- Attic noticeably hotter than outside temperature in summer
- Upstairs rooms hard to cool
- Frost or condensation on the underside of the roof deck in winter
- High energy bills in summer
Likely causes
- CommonBlocked soffit ventsInsulation often gets pushed against soffit vents, cutting off fresh air intake.
- CommonInsufficient ridge or roof ventingHot air has nowhere to escape without enough exhaust vent area at the top.
- PossibleBathroom or kitchen exhaust fans venting into the attic instead of outsideThis dumps warm moist air directly into the attic space.
- PossibleToo little attic insulationHeat from the living space rises more easily into an under-insulated attic.
What to do
- On a cool day, check the attic with a flashlight for insulation blocking the soffit vents and pull it back if so.
- Look for a ridge vent, gable vents, or box vents and confirm they aren't painted over, blocked, or damaged.
- Check that bathroom and kitchen exhaust fans vent through a duct to the outside, not just into the attic.
- Measure or estimate current insulation depth and compare to recommended levels for your climate.
- Add or top up attic insulation if it's below recommended levels, being careful not to block soffit vents.
- Consider adding a ridge vent or additional roof vents if intake and exhaust are unbalanced.
- Recheck attic temperature and any ice dam or condensation issues after improvements, ideally the next season.
Tools and parts
- Flashlight
- Tape measure
- Dust mask
Attic insulationSearch: “blown-in attic insulation”
Ridge or roof ventsSearch: “roof ridge vent kit”
When to call a pro
Call an insulation or roofing contractor to balance ventilation and add insulation if attic temperatures or ice dams remain a problem.
Safety
Use caution
Wear a dust mask and step only on ceiling joists or a plank in the attic, never on the drywall between them.