Ancient Wisdom Meets Building Science: Vapour Diffusion Explained | Part III скачать в хорошем качестве

Ancient Wisdom Meets Building Science: Vapour Diffusion Explained | Part III

Vapour is invisible — silent, molecular, and easy to overlook. But even without air movement or liquid water, moisture can still slip through walls, one molecule at a time. This hidden process is called vapour diffusion — and in modern construction, how we control it can determine whether a wall stays dry or slowly rots from the inside. In Episode 4 of our Four Control Layers series, we explore how vapour diffusion actually works, why vapour barriers were invented, when they help, and when they accidentally trap moisture instead of preventing it. You’ll learn: • Why vapour can move through materials even without air leaks • The physics of vapour pressure and dew point • How the 6-mil polyethylene vapour barrier became standard in cold climates • The difference between a vapour barrier and a vapour retarder • Why “smart” membranes open and close with humidity • Why double vapour barriers can trap moisture • Why rammed earth doesn’t need a vapour barrier at all Whether you’re a builder, homeowner, designer, or someone working toward a healthier home, understanding vapour control is essential. Moisture doesn’t just enter walls through leaks or airflow — sometimes it gets in quietly, molecule by molecule. ⏱️ Chapters 0:00 Introduction: Vapour, the Invisible Force 01:25 How did the Vapour Barrier Come to Be? 03:14 Vapour Barrier vs Vapour Retarder 04:28 Drying Potential & Material Choice 05:46 In Rammed Earth 06:44 Looking Ahead 👉 Watch the rest of the series: • Episode 1 – Series Introduction: (   • The Four Control Layers | Series Intro: Ho...  ) • Episode 2 – Water Control Layer: (   • Why Modern Walls Get Wet Inside (And Ancie...  ) • Episode 3 – Air Control Layer: (   • Видео  ) • Episode 4 – Vapour Control Layer: (you’re here) • Episode 5 – Thermal Control Layer: (   • Thermal Control Layer: Ancient Building Sc...  ) ➡️ Subscribe so you don’t miss Episode 5 on thermal control — how temperature determines whether condensation forms inside walls, and how rammed earth handles the challenge differently. If you learned something new or have thoughts to share, drop a comment below — we’d love to hear. #healthybuilding #buildingscience #vapourcontrol #vaporcontrol #vaporbarrier #vapourbarrier #moisturemanagement #rammedearth #homebuilding #indoorairquality #moldprevention #cirs