「○○だから内部結露しません」という工務店が実は危ない

"It won't condense because it's made with cellulose fiber" or "It won't condense because we use highly breathable facings." Sales pitches like these are commonly used in the housing industry. The people making these pitches are simply repeating what they've heard from their own company or building material manufacturers. Very few companies actually verify or calculate whether these pitches are true. Whether or not internal condensation actually occurs changes constantly depending on the indoor temperature and humidity, the outdoor temperature and humidity, and the cross-sectional structure. The only way to verify this is through condensation calculations. However, most companies don't even know the term "condensation calculation." Fortunately, with some study, it's possible to calculate condensation manually. By watching this video to the end, you'll clearly understand the truth about internal condensation, something that hasn't been clear to you despite reading countless literature and websites.