Which of the following is a common method to reduce sound infiltration into a building?

Installing door seals is a common method for reducing sound infiltration into a building because these seals create a tight barrier between the door and its frame. This minimizes gaps where sound could pass through, effectively dampening noise from entering or exiting a room. Door seals, often made of materials like rubber or foam, enhance acoustical performance by preventing sound waves from moving through the openings that would otherwise allow sound leakage.

In contrast, options such as using thinner walls would typically allow more sound to penetrate, as they offer less mass and are less effective at blocking sound transfer. Frequent maintenance can contribute to overall building performance but does not specifically target sound insulation. Having open spaces can actually facilitate sound movement, allowing noise to travel more freely rather than being absorbed or blocked. Therefore, installing door seals stands out as a specific, effective method to combat sound infiltration.