Brickwork face delamination is generally known as fretting and is typically caused by rising damp issues. The problem is observed between ground level and up to 1.5m high in traditionally constructed masonry walls. This is controlled normally by the installation of a damp proof course (DPC) that creates a barrier between ground water and the facade. Where no DPC exists or the DPC has been compromised, ground water can cause damp up to 1.5m high via process known as capillary action. If the ground water contains salts, then these salts can migrate up the masonry and re-crystalise behind the surface of the brick, causing delamination. The solution is generally to install a new DPC.

Rising damp drawing up salts from ground as no damp proof course was constructed (DPC).

Brickwork fretting caused by rising damp from salt water. Salts recrystallized at the brick surface causing the brick face to delaminate. This is known as fretting.

Brickwork support pillar suffering extreme fretting. This can lead to structural collapse.

Rectification with specialised DPC injection machine.

Injection of chemical DPC in progress. This will prevent further fretting by providing a cut-off barrier between ground water and facade.