Minnesota Contractors Practice Exam

In the context of roofing, particularly when working with wood shingles on slopes that are less than a 12/12 pitch, proper installation of valley flashing is crucial for preventing water infiltration. The recommended practice is for the valley flashing to extend out from the center line of the valley to ensure that water is effectively directed into the gutter system rather than allowing it to seep under the shingles.

The correct answer indicates that the valley flashing should extend 10 inches from the center line. This measurement is significant because it helps protect vulnerable areas where water can accumulate, especially on lower slopes where the risk of water penetration is higher. A 10-inch extension strikes a balance between providing enough coverage for drainage while not being excessively wide, which could complicate installation or lead to other issues.

Understanding these dimensions is vital for contractors working with roofing systems, as they must adhere to best practices to ensure the longevity and durability of the roofing material while also conforming to local building codes and regulations.