Oregon Construction Contractors (CCB) Practice Test 2026 – All-in-One Resource for Exam Success!

The correct choice emphasizes the necessity of pan flashing that drains to the interior. This feature is crucial for preventing water intrusion. Properly installed, this type of pan flashing helps to channel any water that may accumulate around the window back to the interior of the wall cavity, where it can be effectively managed or drained away.

This method is especially important in certain constructions to ensure that external moisture does not compromise the structural integrity of the building or create potential mold issues within the walls. Adequate drainage through the flashing mechanism plays an essential role in maintaining the durability and safety of window installations.

Other options, while relevant to window installation considerations, do not capture the primary requirement regarding how window sills should manage potential water exposure. Weather stripping would be more focused on air infiltration, and additional insulation addresses energy efficiency rather than moisture management. Meanwhile, pan flashing systems that drain to the exterior could be effective in certain contexts but do not meet the specific criteria outlined in the question regarding the necessity for windows to include features that protect against moisture intrusion into the interior.