Stretch Energy Code


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I'm in Massachusetts and we are using the 2021 IECC with Massachusetts amendments. 


The allowable HERS ratings are lower, with trade-off credits allowed for electric heat pumps, solar, etc.

You need a solar ready zone and setup for future hook-up.

Electric vehicle charging WIRING is required, not installation.

Large additions now require a HERS rating. 

An ERV/HRV system is required.


There are many trade-offs.  For instance, IECC says R-60 in the ceilings but with the Stretch Code, but we can still do R-49.  I wish it was one size fits all.  


For Massachusetts, tighter requirements are coming in July 2024.  Best to read the documentation!

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