How it works
Natural ventilation, intake at the soffits and exhaust near the ridge, keeps the attic dry and closer to outdoor temperature. Once air leaks are sealed and insulation is in place, Extension says only a small amount of ventilation is needed.
- Check that soffit intakes are open and not blocked by insulation.
- Check the exhaust vents near the ridge.
- Seal air leaks from the house before changing the vents.
- Look for frost, damp or mold in the attic as signs of moisture.
When to call
Call when you see frost or damp in the attic, when soffit vents are blocked, or when a roof is being replaced and the venting can be set right.
- Icicles or ice along the roof edge fixes cause
Roof & Attic Ventilation by state
| State | License rule | Busiest months | Confirmed businesses |
|---|---|---|---|
| Minnesota | Contractors who work for homeowners in more than one skill area need a state license as a building contractor, remodeler or roofer, and roofing alone needs one too. License numbers begin BC, CR or RR. | Apr, May, Jun, Jul, Aug | 172 in Minnesota |
Sources
Guides on roof & attic ventilation
- How to Prevent Ice Dams in MinnesotaSeal the air leaks in the ceiling first, then insulate the attic to at least R-50 where space allows, as the Department of Commerce advises. Keep the natural vents open and skip powered ones. Until the work is done, rake snow off the lower roof from the ground after big storms.
How to get a quote
Pick a business from the list and use the contact form or phone number on its own website. Asking two or three lets you compare. Cold Home Guide does not take quote requests.