Buildings
Defects from damp
Rising damp
Common causes:
Earth bridging damp proof course
No vertical tanking to earth retaining wall
No damp proof course under timber joists on sleeper wall
Faulty damp proof membrane under floor
Defective ground and surface drainage
1. No ridge ventilation to ventilate roof space
(condensation)
2. Defective flashing to valley gutter (water penetration)
3. Slipped or cracked slates (water penetration)
4. Cracked rendering (water penetration)
5. Defective paint and putty to window frame (water penetration)
6. Blocked eaves ventilation to roof space (condensation)
7. No asphalt upstand
at junction of flat roof to wall (water penetration)
8. Cracked window sill (water penetration)
9. Cracked asphalt to flat roof (water
penetration)
10. No vapour barrier in flat roof causing
condensation
11. cracked rain water pipe and blocked hopper (water penetration)
12. Cold spot condensation showing inside solid concrete
lintel
13. Faulty damp proof membrane under floor (rising damp)
14. Earth bridging damp proof course (rising damp)
15. lack of door threshold letting in driving rain (water penetration)
1. Defective haunching to chimney top
2. lack of DPC under parapet coping
3. Defective chimney flashing
Other causes:
No air brick where flues have been blocked up (condensation)
Defective sealants around bath (damp patch to wall)
Damp on external walls low down on walls behind pictures and in unventilated
cupboards
Lack of cavity tray over window heads