What are the reasons for requiring a minimum slope on a balcony membrane?

The requirement for a minimum slope on a balcony membrane is primarily to support water drainage. Proper drainage is essential to prevent the accumulation of water on the surface of the balcony, which can lead to various issues, including water damage, mold growth, and deterioration of materials over time. A sloped membrane allows rainwater or melting snow to flow off efficiently, thereby protecting the structural components beneath the balcony from prolonged exposure to moisture. This helps to maintain the integrity of the building and prolong the lifespan of the balcony materials.

The other options, while they may have their significance in the overall balcony design and functionality, do not address the primary concern of managing water effectively. Visual impact relates more to aesthetic choices rather than practical engineering concerns. Enhancing structural integrity could be a secondary effect of proper drainage but is not the main reason for the slope requirement. Facilitating insulation placement may be important for thermal performance but does not directly correlate with the need for a sloped membrane. Thus, supporting water drainage stands out as the most critical reason for this design consideration.