Why it matters

• Even in a newer growth city like Andover, larger and more complex rooflines can still trap ice at valleys, dormers, and roof to wall transitions, and builder grade ventilation does not always account for every roof shape on a bigger custom lot.

• Poor attic insulation that lets heat escape and warms the roof deck from underneath.

• Inadequate attic ventilation that keeps the underside of the roof warmer than the outside air.

• Air leaks around recessed lights, attic hatches, vents, and chimneys that let warm household air reach the attic.

• Heavy snowfall followed by freeze thaw cycles which are common through a Minnesota winter.

• Roof design and older or worn roofing materials that let water back up under the shingles once ice has formed.

When it makes sense to act

• As soon as ice appears, given how quickly a local crew can respond. Being based in Andover means less lead time between a call and an inspection compared to a contractor driving in from across the metro.

• Before a newer roof's warranty terms are affected by unaddressed ice damage. Manufacturer warranties on newer Andover roofs can be affected by unresolved water intrusion, so early action protects that coverage.