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Understanding Rising Damp in Kent Homes

karlneal677
Jul 4
3 min read

Updated: Aug 26

What Is Rising Damp?


Rising damp occurs when moisture from the ground travels upwards through brickwork and plaster by a process called capillary action. Most modern buildings include a damp proof course (DPC) designed to stop this movement. However, in older properties, the original damp proof course may have failed, deteriorated, or be completely absent. As moisture rises through the walls, it carries salts from the ground, which can cause significant damage to internal finishes.


Common Signs of Rising Damp


The most obvious signs include:


Tide Marks


Water-damaged corner wall with peeling paint, brown stains, tiled floor, and a small window in a dim room.

A distinctive brown or yellow line can often be seen running horizontally along internal walls, typically between 300mm and 1 metre above floor level.


Crumbling Plaster


Moisture and salts break down the plaster from within, causing it to become soft, flaky, and unstable.


White Salt Deposits


Known as efflorescence, these white powdery deposits appear as moisture evaporates from the wall surface.


Rotting Skirting Boards


Water-damaged interior wall with peeling paint and rotting baseboard beside a wood floor, showing moldy decay near a doorway.

Timber in contact with damp walls can become soft, swollen, or begin to rot over time.


Peeling Paint and Wallpaper


Decorative finishes struggle to adhere to damp surfaces, leading to bubbling, flaking, and peeling.


Close-up of wall with peeling paint and white salt deposits on baseboard and floor; text explains efflorescence.

Rising Damp vs Condensation


Many homeowners mistake condensation for rising damp. The two problems have very different causes. Understanding the difference is essential before carrying out any repairs.


| Rising Damp | Condensation |

|------------------|------------------|

| Starts at ground level | Often appears around windows |

| Creates tide marks | Produces black mould |

| Causes salt deposits | Causes water droplets |

| Damages skirting boards | Common in bedrooms and bathrooms |

| Usually affects older properties | Linked to poor ventilation |


Why Are Victorian Houses More Susceptible?


Derelict room with peeling walls, black fireplace and mirror, patterned rug, and a bright window with lace curtains.

Kent has many beautiful Victorian properties, particularly in Margate, Ramsgate, Broadstairs, and Canterbury. These homes often experience rising damp because:


  • Original damp proof courses have failed.

  • External ground levels have been raised over time.

  • Traditional materials require breathable solutions.

  • Previous repairs may have trapped moisture inside walls.


Treating older buildings correctly requires experience and an understanding of traditional construction methods.


What Causes Rising Damp?


Common causes include:


Failed Damp Proof Courses


Over time, existing damp proof barriers can break down and lose effectiveness.


Bridged Damp Proof Courses


External paving, flower beds, or render can sit above the damp proof course, allowing moisture to bypass the protection.


Poor Drainage


Standing water around foundations can increase moisture levels within masonry.


Inappropriate Repairs


Modern impermeable materials can trap moisture within older walls rather than allowing them to breathe naturally.


How Is Rising Damp Treated?


The correct treatment depends on the condition of the property and the underlying cause. Typical solutions include:


Damp Proof Course Installation


New damp proof systems can prevent moisture rising through masonry.


Removing Contaminated Plaster


Damaged plaster affected by salts often needs to be removed and replaced.


Replastering With Appropriate Materials


Breathable systems help walls dry naturally and reduce future problems.


Addressing External Ground Levels


Sometimes lowering external pathways or removing bridges over the damp proof course is necessary.


Empty room with orange pendant light, window to backyard, wooden floor, and partially stripped polka-dot wall covering.
Empty room under renovation with exposed brick below a bay window, tied gray curtains, wood floor, and rolls of underlay.
Empty room under renovation with plastered walls, glass doors to a green garden, a broom in the corner, and exposed wiring.

Can Rising Damp Be Fixed Permanently? Yes.


When the root cause is correctly identified and appropriate repairs are carried out, rising damp can be resolved permanently. The key is avoiding quick fixes that simply cover up the symptoms. Painting over damp walls or using anti-mould products without treating the underlying issue rarely works and often leads to more expensive repairs later.


Free Rising Damp Surveys Across Kent



At Thanet Plastering, we provide honest advice and practical solutions for homeowners experiencing damp problems throughout Margate, Ramsgate, Broadstairs, Canterbury, and the surrounding areas. If you've noticed tide marks, crumbling plaster, or persistent damp patches near floor level, we can assess the problem and recommend the most effective treatment. Contact us today to arrange a free rising damp survey and protect your property before minor issues become major repairs.

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