Baffles for Attic Ventilation - How Much Do You Need? (Formula In Video!)

How to Install Attic Baffles + Calculate Ventilation: Step-by-Step Guide for Better Airflow Installing baffles in your attic? Whether prepping for new insulation or trying to boost ventilation, this video walks you through the process with real-world tips and building science insight. I'm Eric Gans, and today I’m in an attic in Maryland showing you how attic baffles are installed, how they function, and how to calculate the net free ventilation area (NFVA) your attic actually needs. From vapor retarder basics to airflow dynamics between soffit and ridge vents, this guide breaks it all down. ✅ Learn what really matters when it comes to attic ventilation ✅ Find out whether your house has a vapor retarder—and what to do about it ✅ Discover why just improving ventilation won’t solve your comfort problems ✅ Understand why air sealing + proper insulation matter most This video is ideal for DIYers, homeowners prepping for insulation, and anyone wondering whether baffles can help reduce heat buildup and moisture in the attic. ⏱️ Chapters 00:00 Introduction and Overview 00:16 Installing Baffles: Purpose and Process 01:05 Understanding Vapor Retarders 02:11 Calculating Net Free Ventilation Area 03:20 Final Steps and Does Adding Baffles Cool An Upper Floor ? 03:49 Conclusion and Final Tips 📌 Key Terms Explained in this video: Attic baffles Net free ventilation area (NFVA) Vapor retarder vs vapor barrier Ridge vent + soffit vent balance Wind washing + insulation performance Proper attic ventilation setup Why attic insulation + air sealing go hand-in-hand 📅 Schedule Your Home Energy Audit in Maryland https://calendly.com/hometrust/schedu... 💬 Got questions about attic airflow or insulation? Drop them in the comments—I'll answer every one. 🔔 Subscribe for more real-world building science, attic walk-throughs, and energy-saving strategies. #AtticBaffles #NetFreeVentilationArea #HomePerformance #VaporRetarder #AtticInsulation #BuildingScience #AirSealing #RidgeVent #SoffitVent #EnergyEfficiency