Washington State Residential Energy Code Technical Code Support

FAQs and Additional Resources

Welcome to Washington State University Energy Programs FAQ and additional resources page. We have the FAQ sorted to the Code year they were created under. Thus if your FAQ is under a code that is different than the code year edition you are applying for, it may need an update.

WSEC-R 2021 Edition FAQs

• Compliance Pathways in 2021 WSEC-R
• U-Factors for Non-Prescriptive Constructions (June 2024)

WSEC-R 2018 Edition FAQs

• Slabs and Below-Grade Walls: Prescriptive Path (December 2023)
• Conditioned Crawlspaces (July 2023)
• Fenestration: Windows, Doors and Skylights (Updated: October 4, 2023)
• Buried Ducts (Updated: October, 2023)
• Code Requirements for Heated Buildings that are Not Dwelling Units (November 2022)
• Log Walls (Updated July 2023)
• Two Heating Systems (October 2022)
• Whole House Ventilation Systems (Updated: November 2022)

Hot Topics Archive

WSEC-R 2018 edition or earlier

• ACEEE Ducts Inside
• Additions and Ducts
• Comparing the Moisture Performance of Wood-Framed Wall Systems
• Efficient Water Heating
• Electric Heat Lock Out on Heat Pumps
• Energy Efficient Home Cooling
• Externally Applied Building Insulation
• Indoor Air Quality - Keeping Homes Dry
• Inspecting Attic Insulation
• Principles of Heat Transfer
• Unvented Attics
• Insuladd - Ceramic-Based Paint Additive
• UltraCBF rFOIL - Foil-Faced Bubble Wrap
• Unvented Crawl Spaces
• Ventilation and Indoor Air Quality Code

Additional Resources

Over the years WSU has collected many additional resources for the public to use such as useful links to additional videos, trainings and other resources such as national organizations like ICC and others. Download the additional resources PDF here.

We are currently verifying and updating our existing links. Our Additional Resources Version I document will mirror the additional resources available on the WSU-EP 2018 website. Version II or higher will have all existing resources verified and the newest resources added. Thank you for your patience’s as we navigate to our new website.