Thermal Bridging Calculator

Calculate the effective R-value reduction and heat loss penalty caused by thermal bridges in your building envelope.

Gross Wall Area (sq ft)

Assembly R-Value

Linear Psi (Btu/hr·ft·°F)

Total Linear Bridge (ft)

Point Chi (Btu/hr·°F)

Number of Point Bridges

Heating Degree Days (HDD65)

Tab to move between fields

Effective R-Value

16.48

Clear-field U-Value0.05

Effective U-Value0.06

R-Value Reduction3.52

Heat Loss Penalty (%)21.3%

Annual Bridge Loss (kBtu)1,920

Gas Wasted (therms)24

How to Use This Calculator

Enter Gross Wall Area in sq ft and the Assembly R-Value without bridging.
Enter Linear Psi value in Btu/hr·ft·°F and Total Linear Bridge length in feet.
Enter Point Chi value and Number of Point Bridges for bracket mounts and anchors.
Enter Heating Degree Days for your climate to calculate annual energy penalty.
Review Effective R-Value, R-Value Reduction, and Annual Bridge Heat Loss to justify continuous insulation.

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