Damp-Proof Materials: Everything You Need to Know

When it comes to maintaining the structural integrity of your home or commercial building, understanding the importance of damp-proof materials is essential. Dampness caused by moisture accumulation can lead to significant structural damage, making damp-proofing a crucial aspect of construction and property maintenance.

This article will explore everything you need to know about damp-proof materials, from various types to suitable applications, ensuring your property remains dry and well-protected. For professional help and advice, don't hesitate to visit Watertight Homes.

Damp-proof materials guide UK - Sheets, Bitumen, Paint, DIY fixes, Pros, and Cons - Comprehensive protection for walls, floors, basements, and bathrooms.

What Are Damp-Proof Materials?

Damp-proof materials are special substances designed to resist moisture penetration. They provide an impenetrable barrier to protect your building or home from the damaging effects of dampness. Also, they play a crucial role in preserving the structural integrity of properties by preventing issues such as mould growth, structural timber decay, and damage to plasterwork.

Whether these materials are applied externally or within the construction itself, they block the pathways that water or moisture might otherwise use to enter and compromise the building. Using damp-proof materials is a proactive approach to reduce the risk of damp-related issues, contributing to the longevity and safety of your structure.

What Are the Different Types of Damp-Proof Materials Used?

Various materials are used in damp-proofing, each with specific properties and applications. Let's explore some of these in more detail.


Damp-proofing sheets are impenetrable membranes typically made from high-density polyethene (HDPE) or polyvinyl chloride (PVC). These sheets are designed to prevent moisture from seeping into a building, acting as a physical barrier between the source of dampness and the structure's interior.


  • Easy to install
  • Durable and long-lasting
  • Effective barrier against moisture


  • It can be expensive
  • It may require professional installation for proper alignment and sealing


Bitumen is a byproduct of petroleum distillation, and it's commonly used in damp-proofing treatments. It's typically applied as a coating or paint on surfaces susceptible to dampness. Its water-repelling nature provides an effective barrier against moisture ingress.


  • Excellent water resistance
  • Durability and long life
  • Versatile application


  • It can be messy to apply
  • Requires careful handling due to its sticky nature


Damp-proof paint is a specially formulated, water-resistant coating that prevents moisture penetration. It works by forming an impermeable layer on the surface to which it is applied, thus preventing moisture entry and helping to mitigate damp issues.


  • Easy to apply
  • It can be painted over existing paint
  • Available in a range of colours


  • Regular maintenance required
  • It might require multiple coats for effective coverage

Bituminous Felt

Bituminous felt is a sheeting material made from organic fibres such as hessian or jute. These fibres are coated with bitumen, resulting in a highly water-resistant material that works efficiently in damp-proofing applications.


  • Highly water-resistant
  • Durable
  • Easy to install


  • Can degrade over time, requiring replacement
  • Difficult to repair once damaged

Mastic Asphalt

Mastic asphalt is a specific type of asphalt that has undergone treatment with mastic, a sticky, resinous substance. This treatment enhances its water-resistant properties, making mastic asphalt an excellent choice for damp-proofing purposes, particularly in areas with substantial water exposure.


  • Highly water-resistant
  • Durable and long-lasting
  • It can be applied to a variety of surfaces


  • Installation can be time-consuming
  • It can be more expensive than other options


Damp-proof bricks are specifically designed and treated bricks that resist moisture absorption. They are often used in the construction of buildings, particularly in the lower courses of walls or other structures, to prevent rising dampness.


  • Durable and resistant to decay
  • Aesthetically pleasing and can blend seamlessly with the construction
  • Effective against rising damp


  • It can be more expensive than other materials
  • Require proper installation to ensure effectiveness


Mortar is a mixture of sand, cement, and a suitable damp-proofing additive. This additive transforms the mixture into an impenetrable barrier, preventing moisture passage through the mortar joints.


  • Easy to apply
  • Versatile and can be used with a variety of building materials
  • Adds structural strength


  • Its application can be messy and require professional expertise
  • Regular inspection and maintenance are required to ensure its effectiveness


Stones used in damp-proofing are generally dense and less porous varieties, often used as part of a damp-proof course or in conjunction with other materials. They prevent moisture transfer from the ground to the building structure.


  • Long-lasting and durable
  • Able to withstand extreme weather conditions
  • Provides an additional layer of moisture protection


  • Can be costly, particularly for large structures
  • Installation might require significant time and professional expertise

How Do You Choose The Best Damp-Proof Materials For The Job?

Choosing the right damp-proof material depends on the specific area of application and the unique conditions each space presents. Here's how to identify the qualities to look for in damp-proof materials for different parts of your structure.

Damp-proof materials guide UK - Sheets, Bitumen, Paint, DIY fixes, Pros, and Cons - Comprehensive protection for walls, floors, basements, and bathrooms.


  • Water Resistance: The material should effectively prevent rising and penetrating dampness.
  • Breathability: The material should allow moisture trapped within the wall to evaporate naturally, especially for internal walls.
  • Durability: The material should withstand weather conditions without degradation.

For walls, a durable and water-resistant material like bitumen can provide reliable protection against both rising and penetrating damp. Its excellent water-resistance properties safeguard the walls from moisture ingress.

If breathability is a concern, particularly for internal walls, then applying damp-proof paint can offer a solution. This specially formulated paint allows moisture trapped within the wall to evaporate naturally, preventing damp-related issues.


  • Abrasion Resistance: The material should withstand foot traffic without wearing down.
  • Moisture Barrier: It should provide an effective barrier preventing moisture from rising from the ground.
  • Flexibility: The material should tolerate slight movements and settling without cracking.

Floors, especially ground-level ones, are susceptible to rising dampness. In this case, a physical damp-proof membrane, like the use of bituminous felt or sheets, can provide a reliable barrier against moisture while resisting wear from foot traffic.

These materials also offer the required flexibility to tolerate slight movements and settling without the risk of cracking and compromising the damp-proofing.


  • Waterproofing: The material must provide superior protection against groundwater.
  • Durability: It should withstand harsh conditions often found in basements.
  • Adaptability: The material should be suitable for the intended use of the basement.

For basements, mastic asphalt can provide superior waterproofing properties against groundwater infiltration. This material offers the necessary durability to withstand the often harsh conditions in basements.

Additionally, mastic asphalt can be used in various basement applications. Whether it's for storage, converted into a living space, or for utilities, mastic asphalt offers adaptability according to the intended use of the space.


  • Water Resistance: The material must effectively cope with high humidity and water exposure.
  • Hygiene: It should resist mould and mildew growth, maintaining a hygienic surface.
  • Longevity: Given the constant exposure to water, the material should offer long-lasting damp protection.

Due to the high humidity and constant water exposure in bathrooms, water-resistant paints are an excellent choice, providing protection against moisture and helping to maintain a clean, hygienic surface by resisting mould and mildew growth.

Additionally, tiles made from damp-proof bricks can offer a long-lasting solution, withstanding constant water exposure and providing a solid barrier against moisture.

What Are The Different Types Of Damp-Proofing?

Damp-proofing treatments vary, and the most effective type often depends on the specific damp issues being addressed. Let's delve into two common types of damp-proofing:

Damp-Proof Course (DPC)

A Damp-Proof Course (DPC) is a preventive measure used in construction to resist the upward movement of moisture through a structure, a problem commonly known as rising dampness. A DPC is typically a layer of water-resistant material (such as bitumen, sheets, or specially treated bricks) installed within the fabric of a building at a point above ground level.


  • Effective prevention of rising damp
  • Increases the lifespan of the building
  • It can be installed in both new constructions and existing buildings


  • Installation can be complex and often requires professional help
  • Incorrect placement can lead to ineffective damp-proofing

Damp-Proof Membrane (DPM)

A Damp-Proof Membrane (DPM) is a membrane material applied to prevent moisture transmission. It's often used on floors and walls, providing a physical barrier between the moisture source and the interior of the building.


  • Provides a physical barrier to moisture
  • It can be used in various parts of the building
  • Effective in areas with high moisture levels


  • It can be expensive to install
  • Requires professional installation to ensure proper sealing and overlapping of joints

Can You Fix Damp Yourself Or Do You Need A Professional?

Yes and no. Fixing damp issues yourself is possible, but only if you have the necessary expertise and confidence to tackle DIY tasks.

Simple measures like improving ventilation, applying damp-proof paint, or even installing a simple damp-proof course can be undertaken by homeowners who understand the nature of the damp problem and its remedy.

However, damp-proofing is often more complex than it appears, involving a detailed understanding of building structures, water behaviour, and various materials and techniques. If you're not completely confident in your abilities or if the damp issue is severe, extensive, or persistent, getting a professional involved is recommended.

Professional damp-proofing companies, like Watertight Homes, have the technical knowledge, experience, and equipment to accurately diagnose damp problems and implement effective solutions. This can save you significant time, money, and stress in the long run, providing a more reliable, long-term fix to protect your property.


Understanding the various types of damp-proof materials and methods is crucial when it comes to safeguarding your property from the damage caused by moisture. While it's possible to handle some damp issues yourself, for more severe or persistent cases, enlisting professional help is often the best course of action.
If you're struggling with damp issues or want to ensure your property is protected, don't hesitate to reach out to our team at Watertight Homes.

Scroll to Top