Wall Assembly U-Value Calculator

Assembly Layers (add up to 8 layers)

Framing Fraction (% wall area)

Stud Depth (in) — cavity depth

Stud R/inch (lumber = 1.25)

Cavity Insulation R/inch (fiberglass batt = 3.14)

Assembly Thermal Performance

Clear-Field R-Total

—

hr·ft²·°F/BTU

Framing Path R-Total

—

hr·ft²·°F/BTU

Overall Assembly R

—

hr·ft²·°F/BTU

Overall U-Value

—

BTU/hr·ft²·°F

ASHRAE 90.1-2019 Prescriptive U-Value Limits (Wood Frame / Metal Frame Walls)

Climate Zone	Wood Frame Max U	Metal Frame Max U	Mass Wall Max U	Your Assembly

U-values from ASHRAE 90.1-2019 Tables 5.5-1 through 5.5-8, nonresidential. “Comply” means your assembly U ≤ the maximum allowed. Consult the actual standard for exceptions and alternate paths.

Do the full calculation in AIM Works

This calculator handles one step. AIM Works runs the complete MEP design workflow — thermal load calculations, duct & pipe networks, equipment selection, code compliance, and an AI design assistant — in one tool.

✓ ASHRAE 62.1 ventilation + CLTD/CLF/RTS load methods

✓ Darcy-Weisbach pipe & duct network solvers

✓ ASHRAE 90.1 / IMC / NFPA compliance checks

✓ 20 free AI design messages included in trial