Waterproofing for Conservatory Roofs

Waterproofing for Conservatory Roofs


Conservatories are a popular addition to homes, providing an additional space that can be enjoyed year-round. However, one of the key challenges when it comes to conservatories is ensuring that the roof is waterproof. There are several effective methods and techniques available for waterproofing conservatory roofs, each with its own benefits and considerations. In this article, we will explore these methods in detail and help you choose the most suitable waterproofing solution for your conservatory.

Waterproofing for Conservatory Roofs
Waterproofing for Conservatory Roofs 1

1. EPDM Roofing

  • EPDM (ethylene propylene diene monomer) is a popular choice for conservatory roofs due to its durability and resistance to weathering.
  • EPDM membranes can be installed in a single sheet, reducing the risk of leaks and providing excellent waterproofing.
  • EPDM roofing is fairly easy to install and requires minimal maintenance, making it a cost-effective option in the long run.
  • EPDM roofs can last for up to 50 years, providing reliable and long-lasting protection for your conservatory.

2. Liquid Roofing Systems

  • Liquid roofing systems, also known as cold applied systems, involve the application of liquid waterproofing materials directly onto the roof surface.
  • These systems are versatile and can be applied to various types of roofs, including conservatory roofs.
  • Liquid roofing systems provide seamless waterproofing, preventing water penetration and effectively sealing the roof.
  • They are highly flexible, ensuring that the roof stays watertight even during temperature fluctuations.
  • Maintenance for liquid roofing systems is relatively simple, and they can be easily Repaired if any damage occurs.

3. Fibreglass Roofing

  • Fibreglass, also known as GRP (glass-reinforced plastic), is another popular option for waterproofing conservatory roofs.
  • Fibreglass roofs are created by laminating layers of fibreglass matting onto the roof surface, creating a strong, durable, and waterproof membrane.
  • The seamless nature of fibreglass roofs eliminates the risk of leaks, providing a reliable waterproofing solution.
  • Fibreglass roofs require professional installation, as the process involves the use of specialist materials and techniques.
  • With proper maintenance, fibreglass roofs can last for several decades, making them a cost-effective option in the long term.

4. Bituminous Membranes

  • Bituminous membranes, also known as felt roofs, are commonly used for waterproofing domestic roofs, including conservatories.
  • These membranes consist of several layers of bitumen and felt, providing excellent waterproofing and protection against the elements.
  • Bituminous membranes are relatively inexpensive compared to other waterproofing methods, making them a popular choice.
  • However, they are not as long-lasting as some other options and may require replacement after 15-20 years depending on maintenance.


Q: How much does it cost to waterproof a conservatory roof?

  • A: The cost of waterproofing a conservatory roof can vary depending on the chosen method and the size of the conservatory. It is recommended to get quotes from multiple Contractors to ensure you get the best price.

Q: Can I waterproof my conservatory roof myself?

  • A: Some waterproofing methods, such as liquid roofing systems, can be DIY-friendly. However, for more complex methods like fibreglass roofing, it is recommended to hire a professional to ensure proper installation and waterproofing.

Q: How often should I maintain my waterproofed conservatory roof?

  • A: It is recommended to inspect and clean your conservatory roof at least once a year. Regular maintenance helps to identify any potential issues and ensures the longevity of the waterproofing system.

Q: Can I apply a waterproofing system over an existing roof?

  • A: In most cases, it is possible to apply a waterproofing system over an existing conservatory roof. However, it is essential to assess the current condition of the roof and consult with a professional for the most suitable solution.


Waterproofing your conservatory roof is crucial to protect your investment and ensure the longevity of your space. Choosing the right waterproofing method depends on various factors such as cost, durability, and maintenance requirements. EPDM roofing, liquid roofing systems, fibreglass roofing, and bituminous membranes are all effective options for waterproofing conservatory roofs. Consider your specific needs and consult with professionals to determine the most suitable method for your conservatory. Regular maintenance and inspections will help to identify any potential issues early on and ensure the longevity of your conservatory roof’s waterproofing system. With the right waterproofing method in place, you can enjoy your conservatory year-round, whatever the weather.

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