Unequal slope valleys require a valley flashing with an inverted V that is how high?

In the context of sheet metal work for roofing, the requirement for valley flashing with an inverted V shape is crucial for effective water drainage and prevention of leaks in areas where two slopes meet. When dealing with unequal slope valleys, the flashing must be sufficiently high to ensure that water is directed away from the seams and into the valley, minimizing the potential for water infiltration.

The appropriate height of the valley flashing, being 1" to 1 1/2", is designed to accommodate the flow of water from both slopes without allowing any to back up or overflow. This height is generally sufficient to manage the most common weather conditions while ensuring that any debris does not impede water flow.

In scenarios with higher slope ratios or when the roofs are particularly steep, higher flashing may be recommended to further ensure efficacy, but for average configurations of unequal slopes, the specified range effectively balances practicality and performance. This is why the chosen answer aligns with best practices in HVAC sheet metal applications.