Seal it, then fill it
Attic Insulation in Allegan, MI
Most heat escapes through the top of an old house. Sealing and insulating the attic stops it.
- Free on-site estimates
- Written quote listing material, thickness and R-value for each area
- Old wiring, moisture and rim joists checked before we price
The Attic Comes First
Attic insulation is usually the first upgrade we suggest for an older Allegan home. Warm air rises through gaps around chimneys, plumbing stacks, light fixtures, the attic hatch and the tops of walls, then melts snow on the roof and forms ice dams at the cold eaves. Many old attics have a few inches of rock wool or nothing at all.
The targets
Michigan's code table lists R-38 for ceilings in Zone 5. The DOE recommends R-60 for an existing attic with little or no insulation, or adding R-49 on top of 3 to 4 inches. Consumers Energy's rebate page has tied its attic rebate amounts to the final R-value.
Seal before insulating
We seal top plates, wire and pipe holes, chases and chimneys (with proper clearance materials) and the hatch. Balloon-framed houses also need their open wall tops blocked, or warm air keeps pouring up from the basement through the walls.
Blown-in, dense-pack or foam
For an open attic floor, blown-in cellulose or fiberglass over a sealed ceiling is the cost-effective choice. In 1½-story houses with kneewalls and short sloped ceilings, foam or dense-pack is often the only thing that fits.
Bath fans and frost
Bath fans that vent into the attic dump moist air that freezes on the roof nails and drips in spring. We duct them to the outside during attic work. Recessed lights get covers or sealing so they stop leaking warm air.
We will measure your attic and send a written price. Get a free estimate
What Attic Work Includes
Typical attic work in Allegan County homes.
Air sealing
Top plates, penetrations, chases and the hatch.
Blown-in cellulose or fiberglass
To the target depth with depth markers.
Kneewalls and slopes
Foam or dense-pack in tight spaces.
Eave baffles
Keep the roof venting and insulation off the soffits.
Published Attic Insulation Costs
| Job | Range and source |
|---|---|
| Attic insulation, average job | $1,000 to $2,700, about $1,800 average (HomeGuide) |
| Air sealing | $350 to $3,000 (HomeGuide) |
| Blown-in, attic | $0.90 to $2.40 per sq ft (HomeGuide attic guide) |
| Spray foam on the attic floor | $1,100 to $6,800 (HomeGuide) |
| Spray foam on the roof deck | $1,500 to $9,000 (HomeGuide) |
| Spray foam, attic (existing home) | $2,500 to $12,000 (Fixr) |
| Old insulation removal | $1 to $2 per sq ft (HomeGuide) |
National ranges from HomeGuide's January 2026 attic guide and Fixr's 2025 spray foam guide. Sealing, depth, access and removal change the total. We price after seeing your attic, and that written estimate is the price.
How an Attic Job Runs
1. Inspect
Depth, bypasses, ventilation, wiring and roof leaks.
2. Plan
Sealing, depth and price in writing.
3. Seal
Gaps and chases first.
4. Insulate
To depth with baffles.
Attic Insulation Questions
Will attic insulation stop ice dams?
Air sealing plus insulation and clear eave vents are the main fixes.
Can you insulate an attic with knob-and-tube wiring?
Not over live knob-and-tube. An electrician should check or replace it first.
Can new insulation go over old?
Usually, if the old is dry and clean and the ceiling is sealed.
How long does an attic job take?
Most take one day.
Attic Insulation Service Areas
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Get an Attic Insulation Estimate
Ask for an attic check and written price.