What is the minimum pitch required for roof drainage?

The minimum pitch required for roof drainage is set to ensure that water flows off the roof effectively, reducing the risk of standing water that can lead to leaks and structural damage. A pitch of 2:12 is often specified as the standard minimum because it provides a sufficient angle for water to drain away efficiently without risking water pooling. This angle balances durability and functionality, allowing for effective drainage while accommodating different roofing materials.

While lower pitches do exist and can be used in specific situations, a 2:12 pitch is generally viewed as the threshold for practical drainage in most residential construction scenarios. Roofs with less than this pitch may experience drainage issues, leading to maintenance problems over time. Maintaining this minimum pitch is crucial in design and building inspections to ensure long-term performance and safety of the structure.