Calculadora de Isolamento Térmico — Formula

How to Calculate Insulation

Formula

Batts Needed = Total Area / Coverage per Batt

Batt width fits between studs: 15 inches for 16" OC studs, 23 inches for 24" OC studs. Batt length is typically 93 inches (8 ft walls) or 105 inches (9 ft walls). Choose R-value based on application:

  • R-13: Standard 2×4 exterior walls
  • R-19: 2×6 exterior walls
  • R-30 to R-38: Attic floors
  • R-49: Attic floors in very cold climates

    • Exemplo Resolvido

    500 sq ft of wall area with 16-inch OC studs, 93-inch batts, R-13.

    1. Batt width = (16 - 1) / 12 = 1.25 ft
    2. Batt length = 93 / 12 = 7.75 ft
    3. Coverage per batt = 1.25 × 7.75 = 9.69 sq ft
    4. Batts needed = 500 / 9.69 = 51.6 → 52 batts