Air cavity system

Let's say you have a sandwich. Inside the sandwich, there's usually different things like meat, cheese, vegetables, and bread. Now imagine the bread is actually made up of two slices, a top slice and a bottom slice. In between those two slices, there's a little space or gap. We call this space an "air cavity".

In a building, instead of bread, there are walls. Sometimes, we make walls with two layers - an outer layer and an inner layer. And just like how there's an air cavity between the two slices of bread in your sandwich, there's an air cavity between the two layers of wall.

The purpose of having an air cavity system is to keep buildings dry and insulated. When rainwater hits the outer layer of the wall, it can't get inside because there's still a little gap of air before it reaches the inner wall. This keeps the building from getting wet and prevents damage to the inside walls.

The air cavity also acts as insulation. Insulation helps keep warmth inside in the winter and heat outside in the summer. The air trapped inside the cavity acts like a shield, making it harder for heat to move from one side to the other.

So remember, air cavity systems are like the gap between the two slices of bread in your sandwich. They help keep buildings dry and insulated by creating a little pocket of air that acts as a shield.