We bought a 2 year old house. After about 6 months we started noticing hairline cracks in the walls. All these cracks are vertical. These are either in the inside edge where two walls meet, or along the bead, about 1.5 inches from the outside edge. Most of these cracks run a couple of feet.
Is this due to bad workmanship, changing weather, or, settling issues? What clues can help me determine the cause?