While diffusion is often simplified to a movement of particles from high to low concentration, real-world application is far more nuanced. Diffusion is typically a blend of diffusion, capillarity, and surface interactions, all influenced by fluctuating temperatures, vapour pressures, and material variations within structures.

The test at Allan’s Ascot property yielded an impressive result of 0.21 ACH50, well below the Passivhaus limit. Not only did this score pass the Passivhaus requirements, but it also set a new benchmark in my testing experience; 0.21 ACH50 is the lowest score I have ever recorded.

I’m planning a study tour across the Mediterranean next year, focusing on architecture and building science.

Not all exhaust fans perform as you think they should.

Mold has been around a LOT longer than we have. We have learned to live with mold, not the other way around. Mold needs food, the right temperature, and water. The easiest and least expensive way to manage mold is to manage moisture.

I was suprpised today when I learnt that the ABCB have released a BETA ‘housing efficiency’ ‘calculator. The calculator is basically a digitised version of the energy efficiency elemental Deemed to Satisfy provisions.

Gold Star explained.