What is the critical factor for roof pitch when using lapped metal panels?

The critical factor for roof pitch when using lapped metal panels is that it requires proper runoff. When using these types of panels, which are designed to shed water efficiently, the slope of the roof must be adequate to ensure that rainwater can flow off the roof rather than accumulate. Insufficient pitch can lead to water pooling, which may cause leaks, corrosion, or other damage to the roofing material or the structure underneath.

Proper runoff is vital not only for maintaining the longevity of the roofing material but also for preventing water-related issues that can arise if drainage is inadequate. Lapped metal panels depend on the overlapping design to create a watertight seal, making the angle of the roof essential to facilitate proper drainage.

While other factors like weather conditions, structural integrity, and aesthetic appeal can influence roofing choices, they do not specifically dictate the necessary pitch for effective drainage of lapped metal panels. Thus, the emphasis on runoff is what establishes the correct roof pitch essential for this type of roofing system.