Insulation Calculator

R
sq ft/unit
sq ft
units

How to Calculate Insulation Requirements

Calculating insulation needs involves a simple formula:

Formula for Total Wall Area:

\text{Wall Area} = 2 \times (\text{Length} \times \text{Height} + \text{Width} \times \text{Height})

Formula for Insulation Needed:

\text{Insulation Units Required} = \frac{\text{Total Wall Area}}{\text{Coverage per Unit}}
  1. Input Room Dimensions
    • Length, width, and height of the room in feet or meters.
  2. Specify Material Properties
    • R-value (thermal resistance) and coverage per unit (e.g., square feet/unit).
  3. Get Results
    • The calculator displays the total wall area and the number of insulation units required.

Example:

Let’s say insulating a rectangular room with these details:

  • Room Dimensions: 15 ft length, 12 ft width, and 9 ft height.
  • Material Coverage: 32 sq ft/unit of fiberglass insulation.

Calculate the wall area.

\text{Wall Area} = 2 \times [(15 \times 9) + (12 \times 9)] = 2 \times [135 + 108] = 486 \, \text{sq ft}

Calculate insulation required.

\text{Insulation Needed} = \frac{486}{32} = 15.19 \, \text{units} \, (\text{round up to 16 units})