Insulation Calculator

Recommended R-Values by Area

• • Attic: R-38 to R-60
• • Cathedral Ceiling: R-30 to R-38
• • Exterior Walls: R-13 to R-21
• • Floor: R-25 to R-30
• • Basement Walls: R-10 to R-15
• • Crawl Space: R-19 to R-25

Climate Zone Considerations

• • Cold climates need higher R-values
• • Hot climates benefit from radiant barriers
• • Mixed climates require balanced insulation
• • Coastal areas need moisture-resistant options

Batt and Roll Insulation

Pre-cut fiberglass or mineral wool sections that fit between studs and joists. Available in various R-values and widths. Easy DIY installation for standard framing.

Blown-In Insulation

Loose-fill cellulose or fiberglass blown into attics and wall cavities. Excellent for irregular spaces and retrofits. Requires special equipment for installation.

Spray Foam Insulation

Expanding foam that seals gaps and provides high R-value per inch. Available in open-cell and closed-cell formulas. Professional installation recommended.

Proper Installation Techniques

• • Fill cavities completely without gaps
• • Don't compress insulation (reduces R-value)
• • Use vapor barriers in cold climates
• • Seal air leaks before insulating
• • Maintain ventilation in attics
• • Keep insulation away from recessed lights
• • Wear protective equipment during installation

Common Mistakes to Avoid

• • Leaving gaps between batts
• • Compressing insulation to fit
• • Blocking soffit vents in attics
• • Installing wrong vapor barrier direction
• • Ignoring electrical boxes and penetrations
• • Not accounting for settling in blown-in

Material Cost Ranges

• • Fiberglass batts: $0.40-$0.70 per sq ft
• • Blown-in cellulose: $0.60-$1.20 per sq ft
• • Blown-in fiberglass: $0.50-$1.00 per sq ft
• • Spray foam (open-cell): $1.00-$1.50 per sq ft
• • Spray foam (closed-cell): $1.50-$3.00 per sq ft

Energy Savings Potential

• • Reduce heating/cooling costs by 15-30%
• • Payback period typically 2-7 years
• • Increase home resale value
• • Improve comfort and temperature consistency
• • Reduce noise transmission between rooms