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clink button above to link to full version of IECC ~ codes below are parts of code for reference only 

R401.1 Scope. 
This chapter applies to residential buildings. 

R401.2 Compliance. 
Projects shall comply with Sections identified as "mandatory” and with either sections identified as "prescriptive” or the performance approach in Section R405. 

R401.3 Certificate (Mandatory). 
A permanent certificate shall be completed and posted on or in the electrical distribution panel by the builder or registered design professional. The certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label or other required labels. The certificate shall list the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawlspace wall and/or floor) and ducts outside conditioned spaces; U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration, and the results from any required duct system and building envelope air leakage testing done on the building. Where there is more than one value for each component, the certificate shall list the value covering the largest area. The certificate shall list the types and efficiencies of heating, cooling and service water heating equipment. Where a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, the certificate shall list "gas-fired unvented room heater,” "electric furnace” or "baseboard electric heater,” as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces or electric baseboard heaters.



R402.1 General (Prescriptive). 
The building thermal envelope shall meet the requirements of Sections R402.1.1 through R402.1.4. 

R402.1.1 Insulation and fenestration criteria. 
The building thermal envelope shall meet the requirements of Table R402.1.1 based on the climate zone specified in Chapter 3. 

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