02/05/2025
Understanding Falls to Waste: Why It Matters in Waterproofing and Construction
In construction, falls to waste—or the slope designed to direct water toward a drainage point—is one of the most critical yet often overlooked elements in achieving a watertight, functional, and durable wet area or roof system.
Whether it’s a balcony, bathroom, or rooftop, correct falls ensure water flows efficiently to designated outlets, reducing the risk of ponding, membrane failure, and long-term structural damage. Poor falls are one of the most common causes of waterproofing failures and rectification costs, especially in multi-residential or commercial builds.
Best Practice Includes:
• Designing a minimum fall of 1:80 (or 1:100 in some applications) as per NCC and AS3740/AS4654 requirements.
• Ensuring falls are formed prior to membrane application—not relying on membrane buildup to create slope.
• Confirming falls with laser or digital levels during QA to prevent costly rework.
• Coordinating early with structural and hydraulic consultants to ensure compatibility and compliance.
At iComply Consulting Group, we often see costly defects that could have been avoided with proper fall planning and ex*****on. A few millimeters off can be the difference between a compliant wet area and a recurring defect.
Falls aren’t optional—they’re essential.
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