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  • Writer's pictureM & A Group

Mastering the Art of Flat Roof Drainage: Ensuring Correct Fall for Longevity

Flat roofs are a popular choice for modern buildings, offering a sleek and minimalist aesthetic. However, one crucial element that often goes overlooked is proper drainage, ensuring rainwater and debris flow away efficiently. Without the correct fall, flat roofs can become prone to leaks, ponding, and structural damage. Here's a guide to ensure your flat roof maintains the right pitch for longevity and functionality.

Understanding the Importance of Correct Fall:

The primary purpose of the correct fall on a flat roof is to facilitate efficient water drainage. Unlike sloped roofs, flat roofs need a subtle slope or pitch to guide water towards designated drainage points, preventing the accumulation of standing water. Ponding water not only compromises the roof's integrity but can also lead to leaks, insulation damage, and the growth of harmful mold.

Determining the Ideal Pitch:

The ideal pitch for a flat roof typically ranges from 1:80 to 1:40 (1cm fall in every 80cm or 1cm fall in every 40cm), directing water towards the roof's edges where gutters and downspouts can effectively carry it away. Achieving this pitch requires careful planning during the design and construction phases. Consult with a roofing professional or architect to determine the specific requirements for your building.

Checking and Maintaining the Pitch:

Regular inspections are essential to ensure the continued effectiveness of the roof's pitch. Over time, settling, structural shifts, or debris accumulation may affect the fall. Conduct routine checks to identify any areas where water might be pooling. Addressing these issues promptly can prevent long-term damage and extend the life of your flat roof.

Implementing Proper Drainage Systems:

In addition to the correct pitch, a well-designed drainage system is crucial for a flat roof's performance. Install roof drains, scuppers, and gutters strategically to efficiently guide water away from the roof's surface. Keep these components clear of debris to prevent blockages that could compromise drainage.

Professional Expertise Matters:

When it comes to ensuring the correct fall on your flat roof, seeking professional expertise is invaluable. Roofing professionals possess the knowledge and experience to assess, design, and maintain the optimal pitch for your specific structure. Regular consultations and inspections with roofing experts can help identify and address potential issues before they escalate.


Maintaining the correct fall on your flat roof is a fundamental aspect of ensuring its longevity and functionality. By understanding the importance of proper drainage, determining the ideal pitch, conducting regular checks, implementing effective drainage systems, and relying on professional expertise, you can safeguard your flat roof against water-related issues and enjoy the benefits of a durable and resilient roofing system.

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