Mon–Sat 7:00am–5:00pm · Closed Sunday · Serving Sioux Falls, SD & the surrounding area (605) 941-6547
Knight Insulation Knight InsulationSioux Falls, South Dakota
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Attic Insulation · Sioux Falls, SD

Attic insulation, done in the order that actually keeps heat where you want it.

The attic loses more heat than any other part of a house. We check air-sealing and ventilation before we add insulation, because piling insulation on top of an air leak just hides the problem.

RIDGE VENT (OUT) SOFFIT (IN) SOFFIT (IN) ATTIC AIR LIVING SPACE

What we check before we insulate

  • Air leaks around can lights, the attic hatch, plumbing stacks, and top plates
  • Soffit and ridge venting — blocked vents cause ice dams and moisture problems, not just heat loss
  • Existing insulation depth and condition, so you’re not paying to bury a problem
  • Baffles at the eaves to keep new insulation from choking off soffit airflow

Then we insulate

Once the air-sealing and venting are right, we bring the attic up to a target R-value with blown cellulose or fiberglass, evenly across the whole floor — not just the easy-to-reach middle. For finished attic spaces or roof decks, spray foam at the rafters is usually the better call; we’ll walk you through which applies during the estimate.

Ice dams, cold rooms, or a January heating bill that doesn’t add up?

Free on-site estimates — call, text, or send the form.

Call (605) 941-6547