At some given time, the pointing to your brickwork may need attention. The gap or space between the brickwork to your property is where the mortar bed is. As time goes by this mortar bed can sometimes deteriorate, usually as a result of being exposed to the elements and old age. The mortar can become crumbly or powdery and start to fall out leaving the structure at risk of developing damp issues inside.
To ensure your property remains watertight check over the pointing to your house where you suspect re-pointing works may be required or call out a contractor such as 5KC to carry out an inspection for you. Further info on damp causes as a result from water ingress can be found here.