A cavity closer is a building component designed to fill and seal the cavity between the inner and outer layers of a wall, typically in timber or masonry construction. It is an important element in creating a thermally efficient and structurally sound building envelope.
The purpose of a cavity closer is to prevent the passage of air, moisture, and pests between the inner and outer walls. It helps maintain a continuous thermal barrier, reduces heat loss, and enhances the overall energy efficiency of the building. By sealing the cavity, a cavity closer also aids in preventing dampness, condensation, and water ingress, which can cause damage to the structure and affect the internal environment.