Rising Damp

Expert Rising Damp Solutions by LC Joinery Scotland

Rising damp refers to the upward movement of moisture from wet ground through the mortar and bricks or stones of a building’s walls. This moisture defies gravity, moving via capillary action much like oil through a wick. Rising damp can severely impact the structural integrity of a building, be costly to treat, and pose significant health risks to inhabitants.

What Causes Rising Damp?

Modern houses are typically equipped with a damp-proof course (DPC) during construction. This is a waterproof membrane made of strong PVC or similar materials, placed at least 150mm above ground level but below the ground floor, forming a barrier to prevent moisture from rising. Alternatively, a chemical DPC might be used, infusing bricks with waterproofing properties.

Older properties may use materials like slate, bitumen, or hessian, or may not have a DPC at all. If the DPC is damaged or compromised, moisture can breach this barrier, leading to rising damp. Common issues include soil buildup against walls or rubble accumulation in cavity walls, both of which can create pathways for moisture to ascend.

The Dangers of Rising Damp

Rising damp can cause numerous problems, including:

Wet Rot or Dry Rot: These conditions are highly destructive to structural timbers.
Mould Growth: Mould is unsightly and a health hazard, emitting spores that can aggravate or cause respiratory issues.
Electrical Hazards: Excess moisture can lead to short-circuiting and electrical fires.
Damage to Interiors: Moisture can damage walls, fixtures, furniture, plaster, and decorations, as well as cause heat loss and energy inefficiency.

Appearance and Indicators

Rising damp often presents as a brown/yellow “tide mark” around 1.5 meters high, caused by salts in the moisture. Other signs include:

Damp patches starting at the floor.
Sodden carpets or lifting floor coverings like tiles or vinyl.
Peeling wallpaper or paint.
Damp or rotting skirting boards.
White, powdery efflorescence on lower walls.

Accurate Diagnosis

It’s crucial to accurately diagnose the true cause of damp. Mistaking rising damp for other issues like penetrative damp, rot, condensation, plumbing leaks, or structural faults can lead to ineffective and costly treatments. Always consult a qualified professional to thoroughly investigate and diagnose damp problems.

Next Steps: Speak to a Rising Damp Specialist

If you notice signs of damp in your property, contact LC Joinery Scotland. We have extensive experience dealing with rising damp, penetrative damp, wet rot, dry rot, and other related issues. Our fully trained and professionally qualified surveyors use specialist equipment to investigate even unexposed areas such as behind walls or below floorboards.