Why Rainy Season Unlocks Odors Trapped in Gypsum Walls
Every June, the same apartment unit. Same complaint: “It suddenly starts smelling when the rainy season hits.” I replaced the drain lines. Replaced the carpet. The smell came back the following June anyway. It took three years of identical complaints before I started suspecting the walls themselves. What I found wasn’t a ventilation problem or a hygiene problem. It was a structural one — built into the same porous architecture that makes gypsum board so valuable in the first place. The material that breathes also remembers. And when humidity rises, it exhales everything it stored.