Metal valley flashing should be a minimum of _____ inches wide.

Metal valley flashing is an essential component in roofing that helps manage water runoff and directs it safely into the gutters, preventing water penetration and damage. The minimum width for metal valley flashing is set at 24 inches. This width ensures ample coverage over the valley area, providing a larger surface for directing water flow effectively. Additionally, a wider flashing can accommodate variations in roof pitch and help prevent problems such as leaks and water pooling, which can occur with inadequate flashing.

While narrower widths might be used in certain situations, they do not provide the necessary coverage and protection that a 24-inch flashing offers. This standard serves as a guideline to ensure that the flashing is capable of handling the volume of water that can flow down valleys during heavy rain or snow melt, thus reinforcing the integrity of the roofing system as a whole.