Question

What could cause the loud thud in the attic? It happens irregularly, almost like someone dropped a heavy weight or fell and the house shakes a bit? You can feel it on the first floor and second floor.

Answer 1

A loud thud in the attic that causes the house to shake could be caused by several factors. Here are some possible explanations:

1. Temperature Changes: Wood in the attic can expand and contract due to temperature changes, which may cause loud cracking or popping sounds. When the wood expands or contracts, it can create sudden noises and vibrations.

2. Animal Activity: Animals such as squirrels, raccoons, or birds may have made their way into your attic. These creatures can be quite active, and their movements could create thumping or shaking sensations throughout the house.

3. Settling of the House: Houses can settle over time, especially if they are relatively new constructions. This settling can lead to creaking and thudding sounds as the structural elements adjust to their new positions.

4. Wind and Weather: Strong winds or other weather-related factors could cause the attic structure to move slightly, resulting in loud noises and vibrations that can be felt in the rest of the house.

5. HVAC System: If your HVAC system is located in the attic, turning on or off the system can create sudden pressure changes that may lead to noise and vibrations throughout the house.

6. Plumbing or Water Hammer: The sudden stopping or starting of water flow in pipes can cause a phenomenon known as "water hammer," leading to loud thuds that may resonate through the house.

7. Structural Issues: In some cases, the thudding sound and shaking could be related to structural issues in the house. For example, if there's a problem with the foundation or support beams, it may cause sudden movements and noises.

To determine the exact cause of the loud thud and shaking, you may want to perform a thorough inspection of the attic and the rest of the house. Look for signs of animals or pests, check for any visible structural damage, and consider if any recent changes or events could be related to the issue. If you're unable to identify the cause or if you suspect a structural problem, it's best to consult a professional contractor or home inspector to assess the situation and provide appropriate recommendations.