Envelope · Insulation planning

Measure the cavities. Check the R-value.

Estimate package quantities and cost while comparing product thickness and labeled R-value per inch with a project target.

← Surface length →↕ Surface height↔ Cavity thicknessOpenings excluded

1 Measure the insulated surfaces

Average surface lengthfeetSurface heightfeetWall surfacescountDoors and windowsft²Additional ceiling areaft²

2 Set product and thermal assumptions

Waste allowancepercentCoverage per packageft²Price per packageUSDInstalled thicknessinchesProduct R-value per inchR / inchTarget R-valueR

Results update automatically · use the labeled product R-value and installed thickness

Transparent calculation

Coverage and nominal thermal resistance remain separate.

Surface area determines packages. Installed thickness multiplied by the product's labeled R-value per inch produces a nominal material R-value—not a whole-assembly code determination.