Damp proofing can feel complicated and expensive. However, our damp proofing solutions make it affordable and effective. We use trusted products from Plascon, Sika, and ABE to ensure lasting results. With 28 years of industry experience, we have seen every type of moisture issue. These range from rising damp and shower leaks to moisture caused by underground water streams.
Why Damp Proofing Is Important
To keep a building strong and durable, you must control moisture entry. Water can penetrate roofs, floors, walls, and other surfaces, causing dampness. This moisture weakens materials, damages the structure, and creates unhygienic conditions.
A damp proof course (DPC) plays a vital role in building design and construction. By reducing moisture penetration, it provides the most effective protection against water damage. Essentially, it acts as a barrier that stops water from entering the structure.
Damp Proofing Your Home 101
This requires expertise and should always be performed by professionals. Understanding the basics, however, helps you make informed decisions. Always select a specialist affiliated with the Waterproofing Federation of South Africa. Addressing the root cause of damp delivers better long-term results than temporary fixes. Over time, proper damp proofing safeguards both your home and your investment.
The Basics of Damp Proofing
A damp proof course (DPC) consists of a physical barrier built into the walls to prevent moisture movement. Contractors usually install it horizontally to stop rising damp from the ground. Vertical installation may also be necessary to block water from exterior walls. Builders typically use a durable waterproof plastic sheet for maximum protection.
Water entering a home does more than harm its appearance. It can also create health risks. Leaking roofs, unsealed balconies, and rising damp remain common sources of moisture. To reduce these risks, repair broken tiles, seal roof coverings, waterproof shower walls, and maintain proper drainage. Flaking paint, blistering plaster, or white salt deposits often indicate rising damp.
Identifying the Source of Damp
Vertical damp appears when exterior ground levels sit higher than interior floors. It also occurs where soil retention puts pressure on walls. In bathrooms, water can seep through grout or form from condensation. Split-level homes frequently develop damp if builders omit vertical damp courses to save time. Additionally, damp may appear in plastered plinths or flower boxes.
Treating Damp Problems
Contractors often apply tanking to treat lateral damp. This method involves removing plaster down to the brickwork and applying a cement-based waterproof sealant. After sealing, they re-plaster the area with damp-resistant cement and inject silicone where needed. This process stops rising damp and prevents further lateral moisture penetration.
Even if a DPC was not installed during construction, professionals can still waterproof your home effectively afterward.
Act Early and Protect Your Home
Contact a damp proofing expert as soon as you notice moisture problems. Early intervention lowers repair costs and safeguards your property’s value. Professional waterproofing also prevents future damage caused by unsightly damp, ensuring your home remains safe and comfortable.
Nobody wants to live with leaks or moisture issues. By choosing qualified professionals, you gain long-term protection through effective moisture control, waterproofing, and reliable repairs.
How to Treat Rising Damp
Many homeowners worry about rising damp and hesitate because they don’t know how to handle it. Before addressing the problem, it’s important to determine whether rising damp is present and how it differs from other types of moisture issues. This guide explains how to identify rising damp, spot its signs, and treat it effectively.
What is Rising Damp?
Rising damp is a rare type of moisture problem that affects walls in flats, townhouses, and other buildings. It occurs when groundwater moves upward through walls via capillary action, similar to water traveling through straws. This water often carries salts, which deposit visibly on walls.
Porous materials such as plaster, timber, joists, and floorboards absorb moisture, spreading dampness further into the structure. Timber rot often signals rising damp.
The first signs usually appear on interior walls. Watch for:
Peeling paint or plaster
Blistering wallpaper
Tide-like stains showing how far water has risen
Early detection helps prevent structural damage and costly repairs.
How to Identify Rising Damp
Accurate diagnosis is critical. Only a qualified, certified surveyor can confirm rising damp, often by analyzing salt deposits. Without experience, it’s easy to confuse rising damp with penetrating damp or condensation.
Homeowners can still look for key signs:
Salt deposits leaving tide marks
Blistering or peeling paint and wallpaper
Damp masonry, not just wet plaster
Musty odours
Fragmented plaster or discoloration
Rotting timber in skirting boards or floor joists
Rising damp poses a greater risk in older buildings or areas with high groundwater. Early treatment using DPC chemicals and high-quality dampproof or anti-mould paints can slow fungal growth and reduce staining.
Although paints cannot prevent rising damp, they can minimize visible damage. Certain paints protect against fungal decay for up to five years. They perform well in wet areas such as bathrooms, kitchens, and laundries, and also suit commercial spaces due to their durable satin finish.
Professional Intervention
Contact a professional as soon as you notice signs of rising damp. Experts can:
Diagnose the cause accurately
Recommend the correct damp proofing method
Ensure the problem does not recur
Methods of Damp Proofing
Several methods prevent or stop rising damp:
1. Damp Proof Course (DPC)
A physical barrier installed horizontally or vertically in walls
Stops moisture from rising through masonry
Typically installed beneath all walls, load-bearing or partitions
2. Damp Proof Membrane (DPM)
Flexible membrane material, usually polyethylene sheets
Protects concrete from moisture, often under slabs
Can complement a DPC
3. Integral Damp Proofing
Add water-resistant chemicals to concrete to make it impermeable
4. Surface Coatings
Apply a thin waterproof layer on walls
Protects against non-pressurized moisture, such as rain
5. Cavity Wall Construction
Separates interior and exterior walls (also called rainscreen construction)
6. Pressure Grouting
Fill cracks and joints in masonry with sealing compounds
Common Materials Used in Damp Proofing
Flexible: butyl rubber, hot bitumen, plastic sheets, bituminous felt, lead, copper
Semi-rigid: mastic asphalt
Rigid: impervious bricks, stones, slates, cement mortar, concrete treated with bitumen
Underfloor solutions: coarse sand layers or continuous plastic sheets
Rising damp is manageable when detected early and treated with the proper methods. Combining a professional assessment with high-quality materials ensures your home stays dry, safe, and structurally sound.
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