Cavity wall

A cavity wall is a wall made of two separate layers (or “leaves”) of masonry, typically brick or block, with a gap (cavity) in between. This space can be left empty or filled with insulation material.

Why it matters:

• The cavity acts as a thermal barrier, reducing heat loss.
• It helps prevent moisture from penetrating from the outside to the inside wall.
• The cavity can also improve sound insulation.

How it works:

• Outer leaf → exposed to weather, protects the building.
• Inner leaf → carries structural loads and supports interior finishes.
• Insulation in the cavity → increases energy efficiency.