Continuous exterior insulation is key to energy efficiency, but what happens when you build in a high seismic zone? In this episode, Bryan breaks down Washington State’s updated energy codes and the structural engineering required to meet them. In this video, we dive deep into continuous insulation and its role in energy-efficient home construction—especially in climate zone 4C where moisture control is critical. Brian explains why polyiso insulation is a smart choice, how thermal bridging impacts efficiency, and the new Washington State Energy Code requirements for exterior insulation. We also explore seismic considerations in high-risk zones, where insulation must work alongside structural sheathing to ensure stability during earthquakes. Bryan demonstrates how Huber Zip System R-sheathing streamlines the build process by integrating insulation, sheathing, and a weather-resistant barrier into one product—reducing steps while improving performance. Key takeaways include: ✅ Understanding R-values vs. U-factors and why they matter ✅ How continuous insulation mitigates thermal bridging ✅ The International Residential Code (IRC) & seismic requirements ✅ How Washington’s strict energy codes compare to other states ✅ Why proper air sealing and water management are just as critical as insulation If you’re building in a climate with high moisture and seismic activity, this episode is packed with must-know details. Don’t miss Bryan’s expert insights—subscribe to The Build Show for more in-depth building science content!