Insulation Calculator
Estimate the number of insulation rolls, batts, or bags required for your attic, walls, or basement project. Optimize thermal efficiency.
Units Required
Total Coverage Area
Insulation Selection
Proper insulation is the most cost-effective way to improve home energy efficiency. Batts are pre-cut panels while Rolls are continuous strips designed for larger spans. Choosing between mineral wool, fiberglass, or cellulose determines your project's final thermal resistance.
R-Value Concept
R-value measures thermal resistance. Higher numbers mean better insulation. For attics in cold climates, look for R-49 to R-60, while southern regions typically require R-38.
Vapor Barriers
Faced insulation has paper on one side to block moisture. The paper should always face the heated side of the room to prevent dampness in the wall.
Coverage Equation
Unit Distribution Logic
Units = ⌈ Total Area ÷ Unit Coverage ⌉
Always round up to the nearest whole roll or batt to ensure full coverage of the calculated area.
Installation Wisdom
- Don't compress insulation; it loses R-value
- Keep it 3' away from recessed lights
- Ensure soffit vents remain unobstructed
- Wear PPE (gloves/goggles) for fiberglass
Soundproofing
Mineral wool insulation is significantly denser than fiberglass, making it the preferred choice for soundproofing interior walls and theater rooms due to its superior acoustic dampening properties.
Roll Requirements (Standard Packages)
Area (sq ft) R-13 Rolls (40 ft²) R-30 Rolls (30 ft²) 500 13 17 1,000 25 34 1,500 38 50 2,000 50 67 Frequently Asked Questions