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Attic Insulation and Ventilation Guide in Mt. Pleasant MI homes appear to oppose each other. They serve completely different purposes that are both essential in Isabella County climate, and when one is missing, the other fails to protect your home. Getting this balance wrong is the primary cause of ice dams, premature shingle failure, and moisture damage in Central Michigan attics.
Insulation sits on the attic floor and resists heat transfer — keeping heat in your Mt. Pleasant living space during winters and slowing 150F summer attic heat from entering living areas. Zone 5 requires R-38 minimum. Energy Plus installs blown cellulose at R-3.8 per inch to R-38, R-49, or R-60. Critical: insulation must not block the ventilation channel at the eave. Energy Plus installs ventilation baffles at every rafter bay along the eave before blowing insulation.
Continuous airflow from soffit vents to ridge vents does three things: In Isabella County winters — keeps roof deck temperature uniform from ridge to eave, preventing the differential that forms ice dams. In summer — exhausts 150F or more attic air that degrades shingles and drives up cooling costs. Year-round — removes moisture vapor rising from the living space, preventing condensation and mold on rafters in Central Michigan humid climate.
One square foot of net free vent area per 150 square feet of attic floor space, split 50/50 between soffit intake and ridge exhaust. For a 1,500 sq ft Mt. Pleasant home: 10 sq ft total, 5 sq ft soffit, 5 sq ft ridge. Many older Isabella County homes are under-ventilated — signs include consistent ice dams every winter and excessive attic heat in July.
Inadequate attic insulation allows heat to escape through the roof deck, warming snow. Meltwater runs toward the eave overhang where the deck is colder. Meltwater refreezes into the ice dam that traps subsequent meltwater and drives it under shingles. Fix: R-38 or more insulation and proper soffit-to-ridge ventilation. Energy Plus evaluates both during every Isabella County attic assessment.
Call Energy Plus at (989) 833-1000. Most Isabella County attics assessed and quoted in a single visit.