Damp Proofing Products Guide: Types, Installation and Cost

Understanding and combating dampness within structures is crucial for maintaining structural integrity over time. That's where damp-proofing products come into play.

This comprehensive guide delves into the variety of damp proofing solutions available, illustrates their installation process, delineates their upkeep requirements, and outlines associated costs.

After reading this guide, you'll be equipped with essential insights to safeguard your property from moisture damage effectively.

What Are Damp Proofing Products?

Damp-proofing products are materials and treatments applied to walls and floors to shield them from moisture intrusion. These products create a barrier against water vapour and liquid water, protecting your building's interior from harmful moisture damage.

What Are The Different Damp Proofing Products?

Damp-proofing products, also known as moisture barriers, are your building's shield against harmful water intrusion.

From walls to floors, these diverse solutions safeguard your property from the damaging effects of dampness, preventing issues like mould growth, structural damage, and even health risks.

The most common types of damp proofing products include damp proof membranes, damp proof course, and waterproof paints and coatings. Let's explore them along with their unique strengths and weaknesses:

Damp Proof Membranes (DPM)

Damp-proof membranes form a continuous barrier against water vapour and liquid water, typically installed beneath floors or within walls.


  • Versatile: Applicable to various building elements.
  • Cost-effective: Often a budget-friendly option.
  • Easy installation: DIY options are available for specific applications.


  • Puncture risk: Requires careful handling and protection.
  • Limited lifespan: May need replacement over time.
  • Not suitable for repairs: Primarily used for new construction or major renovations.

Damp Proof Course (DPC)

A horizontal barrier, traditionally built into masonry walls, the DPC blocks rising dampness from penetrating upwards.


  • Durable: Long-lasting protection for walls.
  • Effective barrier: Stops rising damp at its source.
  • Invisible solution: Doesn't alter the building's aesthetics.


  • Installation disruption: Requires specialist installation, often involving wall injections or excavation.
  • Higher cost: Generally more expensive than DPMs.
  • Not DIY-friendly: Professional expertise is needed for proper installation.

Waterproofing Paints and Coatings

These liquid applications form a protective layer on exposed surfaces, repelling water and preventing moisture ingress.


  • Easy application: Often applied like regular paint.
  • Visible or invisible options: You can choose decorative or clear finishes.
  • Versatile use: Applicable to various surfaces like walls, roofs, and basements.


  • Limited effectiveness: Not suitable for severe damp problems.
  • Requires regular maintenance: They may need reapplication over time.
  • Not breathable: Can trap moisture within walls if not properly applied.

Choosing the right damp-proofing product depends on your specific needs and the type of dampness you're facing. Consulting a professional for an accurate diagnosis and tailored solution is always recommended.

How Do You Install Damp Proofing Products?

Here are the steps to follow to install damp-proofing products:

1. Identify the Problem

Before diving into installation, it's crucial to diagnose the type and source of dampness you're facing. Rising damp, penetrating damp, and condensation all require different approaches. Consulting a professional for an accurate assessment is highly recommended.

2. Choose the Right Product

Based on the diagnosis, select the appropriate damp-proofing product (DPM, DPC, or waterproofing paint) that effectively addresses your specific needs and the affected area. Consider factors like budget, material compatibility, and desired aesthetics.

3. Prepare the Surface

Thoroughly clean and prepare the area where the product will be installed. This might involve removing existing finishes, filling cracks, and ensuring the surface is dry and level.

4. Installation Varies

Specific installation methods differ greatly depending on the chosen product.


Typically laid as sheets overlapping at seams and fixed to walls or floors with specialist adhesives or mechanical fixings. Variations include liquid-applied membranes and self-adhesive options.


Installation can involve injecting chemical barriers into existing walls, excavating foundations to insert a physical barrier, or rebuilding a section of the wall with a built-in DPC.

Waterproofing Paints

Applied like regular paint with brushes or rollers, following the manufacturer's instructions for multiple coats and proper drying times. Variations include breathable and non-breathable options suited for different surfaces.

5. Professional Assistance

While some DPMs and waterproofing paints offer DIY options, complex damp problems or installations like DPCs usually require the expertise of qualified professionals. They possess the required skills, knowledge, and equipment for safe and effective implementation.

How To Maintain The Different Damp Proofing Products?

Just like any defence system, your damp-proofing products require occasional upkeep to ensure they continue to effectively shield your property from moisture intrusion. Here's a general guide to maintaining different types:

1. Regular Inspections

Conduct visual checks periodically, looking for signs of damage, tears, cracks, or mould growth on your damp proofing membranes, coatings, or around injection points in DPCs. Early detection allows for prompt repairs and prevents further moisture issues.

2. Address Underlying Causes

Damp-proofing products primarily offer a barrier, but tackling the root cause of dampness is crucial for long-term success. Fix leaky roofs, repair damaged gutters, and improve ventilation to prevent new moisture sources from overwhelming your defences.

3. Proper Ventilation

Maintain good air circulation within your property, especially in basements and damp-prone areas. Open windows regularly, run extractor fans in kitchens and bathrooms and consider dehumidifiers if necessary. Excess moisture in the air can put extra strain on your damp-proofing measures.

4. Rejuvenate Coatings

Some waterproofing paints and coatings may require reapplication over time, depending on their lifespan and exposure to wear and tear. Follow the manufacturer's recommendations for reapplication intervals and proper techniques.

Damp-proofing products guide installation costs membranes DPC waterproofing paints

How Much Do Different Damp Proofing Products Cost?

Damp-proofing costs can start from £20 up to thousands of pounds. The factors affecting the price are:

  • Product type: Different materials, brands, and application methods significantly impact cost.
  • Project size: The area requiring treatment heavily influences the total price.
  • Labour costs: Location, contractor expertise, and access difficulty affect labour costs.
  • Additional work: Repairs to underlying causes or complex installations add to the cost.

Damp Proof Membranes (DPM)

DIY rolls cost £20-£50 per roll (covers around 5m²). As for professional installation, expect £40-£80 per metre of wall/floor treated.

Damp Proof Course (DPC)

Chemical injection costs anywhere between £1,000-£3,000 (depending on wall length and accessibility). Excavation and replacement can cost £2,000-£5,000+ (depending on wall size and complexity).

Waterproofing Paints and Coatings

Standard paints will set you back £20-£50 per litre (covers around 5-10m²). On the other hand, specialist high-performance coatings cost £50-£100+ per litre.

Final Words

Damp-proofing products are an essential tool in the battle against moisture damage within your property. From a variety of options ranging from damp-proof membranes to waterproofing paints and coatings, each has unique strengths and potential limitations.

The correct installation, regular maintenance, and timely repairs of these products are crucial for maximising their efficiency and prolonging your building's lifespan.

Take that first step to safeguard your property from dampness and its damaging effects by choosing the right damp-proofing product tailored to your needs, installing it correctly, and following up with diligent maintenance.Are you ready to protect your home or business? Watertight Homes is here to help. To learn more about our services and get a quote, call us at 07843 099 906 or through our email system

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