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R-Value Calculator — Wall & Ceiling Insulation

Calculate total R-value from multiple material layers for walls and ceilings

Total R-Value

R-13.4

U-Value

0.074

Layers

4

Layer 1
Layer 2
Layer 3
Layer 4

R-Value Result

Total Assembly R-Value
R-13.4
U-Value: 0.074
✅ Meets wall target (R-13) for Zone 4 (Mixed)

Layer Breakdown

Interior Air FilmR-0.68
Vinyl Siding (0.5")R-0.3
Plywood (1/2") (0.5")R-0.63
Fiberglass Batt (3.5")R-11.2
Drywall (1/2") (0.5")R-0.45
Exterior Air FilmR-0.17
TotalR-13.4

Code Requirements (Zone 4 (Mixed))

WallsR-13 ✓
Attic/CeilingR-38
FloorR-19

What You'll Need

Great Stuff 157906 Insulating Foam Sealant, 12 oz, Cream

Great Stuff 157906 Insulating Foam Sealant, 12 oz, Cream

$8.004.6
View on Amazon
Owens Corning R-13 Pink Kraft Faced Fiberglass Insulation Roll 15 in. x 32 ft. (3)

Owens Corning R-13 Pink Kraft Faced Fiberglass Insulation Roll 15 in. x 32 ft. (3)

$157.264.4
View on Amazon
Wooster Brush RR723-9 Pro/Doo-Z Roller Cover 3/8-Inch Nap, 9-Inch Pack of 3

Wooster Brush RR723-9 Pro/Doo-Z Roller Cover 3/8-Inch Nap, 9-Inch Pack of 3

$37.674.5
View on Amazon
Lichamp 10 Pack Brown Painters Tape 1 inch, Medium Adhesive Brown Masking Tape Bulk Multi Pack, 1 inch x 55 Yards x 10 Rolls (550 Total Yards)

Lichamp 10 Pack Brown Painters Tape 1 inch, Medium Adhesive Brown Masking Tape Bulk Multi Pack, 1 inch x 55 Yards x 10 Rolls (550 Total Yards)

$25.394.8
View on Amazon
Wagner Spraytech 0529010 FLEXiO 590 Handheld HVLP Paint Sprayer, Sprays Most Unthinned Latex, Includes Two Nozzles - iSpray & Detail Finish Nozzle, Complete Adjustability for All Needs, Multi-Colored

Wagner Spraytech 0529010 FLEXiO 590 Handheld HVLP Paint Sprayer, Sprays Most Unthinned Latex, Includes Two Nozzles - iSpray & Detail Finish Nozzle, Complete Adjustability for All Needs, Multi-Colored

$159.994.1
View on Amazon
BOSCH GLM100-23 100 Ft BLAZE Laser Distance Measure, Includes 2 AA Batteries

BOSCH GLM100-23 100 Ft BLAZE Laser Distance Measure, Includes 2 AA Batteries

$49.004.4
View on Amazon
Great Stuff 157906 Insulating Foam Sealant, 12 oz, Cream

Great Stuff 157906 Insulating Foam Sealant, 12 oz, Cream

$8.004.6
View on Amazon
Owens Corning R-13 Pink Kraft Faced Fiberglass Insulation Roll 15 in. x 32 ft. (3)

Owens Corning R-13 Pink Kraft Faced Fiberglass Insulation Roll 15 in. x 32 ft. (3)

$157.264.4
View on Amazon
Wooster Brush RR723-9 Pro/Doo-Z Roller Cover 3/8-Inch Nap, 9-Inch Pack of 3

Wooster Brush RR723-9 Pro/Doo-Z Roller Cover 3/8-Inch Nap, 9-Inch Pack of 3

$37.674.5
View on Amazon
Lichamp 10 Pack Brown Painters Tape 1 inch, Medium Adhesive Brown Masking Tape Bulk Multi Pack, 1 inch x 55 Yards x 10 Rolls (550 Total Yards)

Lichamp 10 Pack Brown Painters Tape 1 inch, Medium Adhesive Brown Masking Tape Bulk Multi Pack, 1 inch x 55 Yards x 10 Rolls (550 Total Yards)

$25.394.8
View on Amazon
Wagner Spraytech 0529010 FLEXiO 590 Handheld HVLP Paint Sprayer, Sprays Most Unthinned Latex, Includes Two Nozzles - iSpray & Detail Finish Nozzle, Complete Adjustability for All Needs, Multi-Colored

Wagner Spraytech 0529010 FLEXiO 590 Handheld HVLP Paint Sprayer, Sprays Most Unthinned Latex, Includes Two Nozzles - iSpray & Detail Finish Nozzle, Complete Adjustability for All Needs, Multi-Colored

$159.994.1
View on Amazon
BOSCH GLM100-23 100 Ft BLAZE Laser Distance Measure, Includes 2 AA Batteries

BOSCH GLM100-23 100 Ft BLAZE Laser Distance Measure, Includes 2 AA Batteries

$49.004.4
View on Amazon

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Example Calculations

1Standard Residential

Inputs

ProjectMedium home
ScopeStandard

Result

ResultSee calculator

Enter your dimensions for accurate estimates.

2Large Project

Inputs

ProjectLarge home
ScopeFull

Result

ResultSee calculator

Larger projects need proportionally more materials.

Frequently Asked Questions

Q

How does this calculator work?

Enter your project dimensions and specifications to get material quantities, sizing, and cost estimates based on industry-standard formulas.

  • Input dimensions and project specs for accurate results
  • Calculations use standard industry formulas and sizing tables
  • Results include material quantities and cost ranges
  • Adjust inputs to compare different scenarios
Q

How accurate are these estimates?

Material quantities are within 5–10% of actual needs including waste. Cost estimates use national averages and vary 20–30% by region.

  • Material quantities accurate within 5–10% with waste factor
  • Cost estimates based on national averages, vary by region
  • Sizing follows industry standards and building codes
  • Verify with local codes and professional assessment
Q

Should I hire a professional?

Many aspects are DIY-friendly, but electrical, plumbing, and structural work typically require permits and professional expertise.

  • DIY-friendly: material purchasing, basic assembly, surface work
  • Professional recommended: electrical, plumbing, structural changes
  • Always check local codes and permit requirements first
  • Professional install adds 40–60% but ensures code compliance
Q

What building codes apply?

Building codes vary by jurisdiction but generally follow IRC for residential. Check with your local building department for specific requirements.

  • IRC covers most residential construction requirements
  • Electrical work: NEC applies nationwide
  • Plumbing: UPC or IPC depending on jurisdiction
  • Always pull required permits to maintain insurance coverage

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Last Updated: Jun 11, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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