You can expect to find lateral damp where the vertical damp proof course has deteriorated or been omitted or incorrectly installed. Some symptoms of lateral damp are the appearance of salts crystallizing on the walls (Efflorescence), flaking or blistering paint and cracked plaster. 

Lateral damp is treated by "tanking" - that is, stripping the plaster off the bricks - applying PRO-STRUCT, a patented cementitious waterproofing system that creates a waterproof barrier which can resist high water pressures on either the negative or positive sides of a wall, to the bare bricks to prevent damp penetration and plastering with damp repellent cement in combination with silicone injection, where necessary, to ensure the prevention of rising damp. 

Flick uses products that have been tested successfully under severe local conditions. 

If there's a problem with the vertical damp course you might find cases of lateral damp

• where the ground is higher than the damp proof course
• in split-level constructions
• in basements
• around plastered plinths
• in flower boxes
• in showers and baths

The plinth brickwork is the part of the wall between the ground and the damp proof course. This brickwork is usually good quality face brick. Bricks below the damp proof course are always wet, but this presents no structural problem. The problem occurs if the plinth is plastered. This allows moisture to be transmitted through the walls to the exterior. The result is damaged and effloresced plaster.