Aluminium foil is one of those things you probably use without thinking. You tear off a sheet, wrap up leftovers, cover a tray, or keep something warm for later. Simple enough. But lately, this everyday kitchen item has been showing up in a place where you would never expect it: taped flat against the wall.
It sounds like one of those odd internet hacks that makes you raise an eyebrow. Why would anyone press foil onto a wall and leave it there for a day or two? Even stranger, some home experts and architects have pointed people toward this trick because it can reveal something useful about a room without tools, meters, or other complicated equipment.
The clever part is that once you know what to look for, this strange little test suddenly makes a lot of sense. Read on to find out more…