Storage

[Timelord]

The cavity wall is NOT wasted space. it is there for a reason... Think about it.... If you bridge or fill the gap, then water absorbed through the outer single brick wall can make its way across to the inner single brick wall. That is the purpose of the cavity. Otherwise you will be inviting damp into your home and modern brick constructed homes - if they did not have a working internal cavity are in no way able to resist water ingress like the older stone construction with rubble infill. The gap also acts as a ventilation for the walls to allow the outer wall to breath and this helps it to dry out. The air gap also acts as a limited insulator.