Attic Insulation Cost Guide
InsulationBlown-in or batt insulation installation in attic to improve energy efficiency, reduce utility bills, and increase comfort.
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Blown-in insulation top-up in accessible attic
Typical Scope:
- ✓Small attic (800-1,200 sq ft)
- ✓Blown-in fiberglass or cellulose
- ✓R-30 to R-38 coverage
- ✓Top up existing insulation
- ✓Easy attic access
- ✓No air sealing included
- ✓1 day installation
Complete insulation upgrade with air sealing
Typical Scope:
- ✓Average attic (1,200-1,800 sq ft)
- ✓Remove old insulation if needed
- ✓R-49 to R-60 blown-in insulation
- ✓Air sealing of penetrations
- ✓Soffit and ridge vent baffles
- ✓Attic entrance insulation
- ✓1-2 day project
Complete attic system with spray foam and ventilation
Typical Scope:
- ✓Large attic (1,800+ sq ft)
- ✓Spray foam on roof deck
- ✓R-60+ insulation value
- ✓Complete air sealing package
- ✓Ventilation system upgrade
- ✓Radiant barrier installation
- ✓2-3 day comprehensive project
Frequently Asked Questions
How much does insulation installation cost?
Insulation installation averages $2,500. Attic insulation costs $1.50-$3.50 per sq ft. Spray foam runs $3-$7 per sq ft. Blown-in insulation costs $1-$2 per sq ft. Proper insulation saves 15-20% on energy bills.
What type of insulation is best?
Spray foam offers highest R-value and air sealing but costs more. Blown-in cellulose is eco-friendly and cost-effective for attics. Fiberglass batts are affordable for walls. Best choice depends on location, budget, and existing insulation.
How much insulation do I need?
Recommended R-values vary by climate and location. Attics typically need R-38 to R-60. Walls need R-13 to R-21. Check local building codes. More insulation doesn't always mean better - proper installation matters most.
Can I add insulation over existing insulation?
Yes, adding insulation over existing material is common and effective. Ensure existing insulation is dry and mold-free first. Don't compress existing insulation. Use unfaced insulation for additional layers to prevent moisture trapping.
How long does insulation last?
Fiberglass and cellulose last 80-100 years if kept dry. Spray foam lasts indefinitely. However, insulation effectiveness can decline if compressed, wet, or damaged by pests. Attic insulation should be inspected every 15-20 years.
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