The answer to 'why is my deck pests' is that your deck may be infested with various pests, such as termites, carpenter ants, or wood-boring beetles. These pests can cause significant damage to the structural integrity of your deck over time. Some common signs of deck pests include visible damage, tunnels or holes in the wood, and the presence of sawdust or other debris.
To address the issue, it's important to identify the specific pest problem and take appropriate action. In some cases, you may be able to handle the problem yourself with DIY pest control methods, such as applying a wood preservative or using insecticide sprays. However, for more severe infestations or if you're unsure of the best approach, it's recommended to call a professional pest control specialist who can properly assess the situation and provide the most effective solution.