The answer to 'why is my wasp scratching sounds' is that the scratching or scraping noise is likely caused by a wasp building a nest. Wasps often make this sound as they chew on wood or other materials to gather the fibers they use to construct their nests. This behavior is common in the spring and early summer as wasps are establishing new colonies.
The scratching sounds can indicate the presence of a wasp nest, either inside your home or in a nearby location. If the nest is located in an area that poses a risk to your family or pets, it's best to have a professional pest control technician remove it safely. Trying to remove a wasp nest yourself can be very dangerous and should only be attempted by experienced individuals.