Waterproofing for Butterfly Butterfly

Waterproofing for Butterfly Butterfly

In architecture, the butterfly roof is a distinctive design that features two opposing roof surfaces that slope downwards towards the center, resembling the wings of a butterfly. This unique roof style has gained popularity over the years due to its striking aesthetic appeal and functional advantages. However, one crucial aspect of butterfly roofs that requires careful consideration is waterproofing. Ensuring proper waterproofing is essential to prevent water leakage and potential damage to the structure. In this article, we will explore various waterproofing methods for butterfly roofs to help you make informed decisions for your roofing project.

Waterproofing for Butterfly Butterfly
Waterproofing for Butterfly Butterfly 1

Why Waterproofing is Crucial for Butterfly Roofs?

Before delving into the different waterproofing methods, it’s important to understand why waterproofing is crucial for butterfly roofs. The distinctive shape of a butterfly roof creates a valley or trough in the middle, making it susceptible to water pooling and potential water penetration. Without proper waterproofing, this design flaw can result in significant water damage, including leaks, mold growth, and structural deterioration. Therefore, careful consideration of waterproofing methods is critical to maintain the integrity and longevity of butterfly roofs.

1. Membrane Waterproofing

Membrane waterproofing is one of the most common and effective methods for waterproofing butterfly roofs. It involves the installation of a continuous, flexible membrane that acts as a barrier against water infiltration. Two popular types of membrane waterproofing include:

  • Bituminous Membranes: Bituminous membranes are composed of modified bitumen and reinforced with polyester or fiberglass. They offer excellent elasticity and durability, making them suitable for butterfly roofs. These membranes are typically installed using torch-on or cold-applied techniques.

  • Single-Ply Membranes: Single-ply membranes, such as EPDM (Ethylene Propylene Diene Monomer) or TPO (Thermoplastic Olefin), provide a seamless and highly flexible solution for waterproofing. They are easy to install and offer long-term protection against water ingress. Single-ply membranes can be mechanically attached, adhered, or ballasted onto the roof surface.

2. Green Roof Waterproofing

Green roofs have gained popularity in recent years due to their environmental benefits and aesthetic appeal. They consist of a layer of vegetation or greenery planted on top of a waterproofing membrane. For butterfly roofs, green roof waterproofing can be a viable option. The waterproofing layer beneath the green roof system ensures that water does not penetrate the structure. The green roof components, including the growing medium and vegetation, also aid in absorbing and managing rainwater runoff.

3. Drainage Systems

Installing an efficient drainage system is crucial for butterfly roofs to prevent water pooling and accumulation. A poorly designed or inadequate drainage system can lead to water penetration and damage. Several drainage options are available for butterfly roofs, including:

  • Scuppers: Scuppers are outlets integrated into the roof parapets or edges that allow water to drain out. They should be strategically positioned to ensure that water is effectively redirected away from the structure.

  • Gutters: Gutters are another essential component of the drainage system. They collect water from the roof surface and guide it towards downspouts or leaders, which direct it away from the building’s foundation.

  • Interior Drains: Interior drains are installed directly on the roof surface, allowing water to drain into a connected drainage system embedded within the building structure. They are particularly useful for large butterfly roof structures.

4. Regular Maintenance and Inspections

Proper maintenance and regular inspections are vital for the long-term effectiveness of any waterproofing system. Some key maintenance practices include:

  • Cleaning Debris: Regularly removing leaves, twigs, and other debris from the roof surface helps prevent clogged drains and promotes proper water flow.

  • Inspecting Seams and Edges: Checking the integrity of the seams, edges, and flashings of the waterproofing system ensures there are no gaps or areas of potential water penetration.

  • Repairing Damage Promptly: If any signs of damage or leaks are detected during inspections, immediate repairs should be made to prevent further water infiltration and structural issues.


Q: Can I waterproof a butterfly roof myself?

A: Waterproofing a butterfly roof requires professional expertise. It involves careful installation techniques, choosing the right materials, and ensuring compliance with local building codes. It is recommended to hire a qualified Contractor with experience in waterproofing butterfly roofs.

Q: How often should I inspect a butterfly roof for waterproofing issues?

A: Regular inspections should be conducted at least twice a year, preferably in the spring and fall seasons. Additional inspections should be carried out after severe weather events to check for any damage or leaks.

Q: What are the signs of a waterproofing issue in a butterfly roof?

A: Signs of a waterproofing issue may include water stains on interior ceilings or walls, mold or mildew growth, musty odors, and visible cracks or deterioration on the roof surface.


Waterproofing butterfly roofs is crucial to prevent water leakage and potential damage. By utilizing effective waterproofing methods such as membrane waterproofing, green roof systems, and proper drainage systems, you can ensure the longevity and structural integrity of butterfly roofs. Regular maintenance and inspections are essential for detecting and addressing any potential issues promptly. Remember to consult a professional for waterproofing installations to ensure compliance with industry standards and local regulations.

Waterproofing Somerset West

Leave a Comment

Your email address will not be published. Required fields are marked *

Open chat
Need help?
Hi there,
Can I offer you a FREE no obligation quote?