The answer to 'why is my wasp damage' is that you likely have a wasp nest or hive on your property. Wasps can cause damage to the exterior of your home by building nests in eaves, under roofs, or in other sheltered areas. Symptoms of wasp damage include seeing the insects themselves, observing a nest or hive, and finding holes or other structural damage.
Wasp infestations can be dangerous, as the insects are aggressive and their stings can be painful or even life-threatening for those with allergies. It's important to address wasp problems promptly, either through DIY methods or by calling a professional pest control technician. Trying to remove a nest yourself can be risky, so it's best to call in an expert if the infestation is severe or you are uncomfortable dealing with it.