While inspecting a forty-year-old house with two layers of shingles, where is the most likely point for leakage?

The most likely point for leakage in a house with two layers of shingles is in the valleys. Valleys are the areas where two roof slopes meet and are particularly vulnerable to water accumulation due to their design. Water typically flows toward the valleys, making them susceptible to leaks if not properly flashed or if debris accumulates and obstructs water flow.

Over time, the roofing material can deteriorate, especially in older homes, leading to potential points of entry for water. In addition, with the presence of two layers of shingles, it can complicate drainage and increase the likelihood of leaks occurring in these meeting points. Proper installation and maintenance of the valley flashings are crucial in preventing leaks, which is why this area is often a focus during inspections. Other areas, while they might experience issues as well, are generally not as prone to leakage as the valleys.