Wall Assembly R-Value Calculator

Our wall assembly R-value calculator determines the true thermal performance of your wall system by accounting for thermal bridging through studs. This reveals why the R-13 insulation in your 2x4 wall doesn't actually give you R-13 performance - wood studs conduct heat faster than insulation.

Thermal bridging through framing members can reduce wall performance by 15-25%. The calculator uses the parallel path method to account for heat flow through both insulation cavities and wood studs, giving you a realistic effective R-value for energy calculations and code compliance.

This calculator is valuable for energy auditors, building designers, and homeowners asking "what is my wall's actual R-value?" or "how much does thermal bridging affect insulation?" Understanding true wall performance helps make informed decisions about energy upgrades.