The answer to 'why is my wasp scratching sounds' is that the wasp is likely trying to build a nest. Wasps make scratching or scraping sounds as they collect materials like wood fibers to construct their nests. This behavior is common in the spring and summer when wasps are actively building their hives.
If you're hearing these sounds, it's important to identify where the nest is located so you can take appropriate action. Wasps can become aggressive when their nest is threatened, so it's best to call a professional pest control technician to safely remove the nest.