THERMAL BRIDGING. R25 does not equal R20+5ci Why? Thermal bridging! The added R5ci reduces heat loss through both the wall cavity and the framing members.

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Presentation transcript:

THERMAL BRIDGING

R25 does not equal R20+5ci Why? Thermal bridging! The added R5ci reduces heat loss through both the wall cavity and the framing members. A cavity insulation only wall using R29 (2x8 framing) is equivalent to R20+5ci (2x6) or R13+10ci (2x4). The effect is even greater with steel framing – steel is more conductive than wood.

Visualizing the Value of CI: Thermal Imaging of Thermal Bridging After ½” rigid foam CI added Before OSB and R-13 batts (cavity insulation only) Source: Dryvit/DOW

R25 does not equal R20+5ci Several states and local jurisdictions have amended the code to replace the R20+5ci with an R25 only requirement. This results in watered down energy efficiency standards from what is intended by the model codes. Advocated by builders and certain reflective industry experts.