Insulation Calculator

Attic Length (feet)

Attic Width (feet)

Current R-Value

Target R-Value

Insulation Type

Total Wall Length (feet)

Wall Height (feet)

Stud Spacing

Cavity Depth

Target R-Value

Insulation Type

Area to Insulate (sq ft)

Target R-Value

Material Type

Current R-Value

Area to Insulate (sq ft)

Insulation Type

Labor Cost (per sq ft)

Vapor Barrier Cost ($)

Old Insulation Removal ($)

Insulation Guidelines

Recommended R-Values by Climate Zone:

Attic (Warm climate): R-30 to R-49
Attic (Cold climate): R-49 to R-60
Walls (All climates): R-13 to R-21
Floors: R-25 to R-30
Basement walls: R-10 to R-15

Insulation Types & R-Values per Inch:

Fiberglass batts: R-3.2 to R-3.8 per inch
Cellulose (blown): R-3.2 to R-3.8 per inch
Rockwool: R-4.0 per inch
Spray foam (open-cell): R-3.7 per inch
Spray foam (closed-cell): R-6.5 per inch

Important Tips:

Never compress insulation - it reduces R-value
Seal air leaks before adding insulation
Proper ventilation is critical in attics
Use vapor barriers in cold climates
Wear protective equipment when installing
Consider energy audit to identify priorities