Solution: Wash away the bird droppings with a powerful garden hose. Avoid using a power washer as too forceful of a stream of water can further damage asphalt shingles. Hire a roofing contractor to inspect the areas of concern on your roofing..
Seeds in Bird Droppings Clog Gutters
The brown solid substance in bird droppings is poo, which can contain seeds that the birds had ingested. If the seeds are still intact when they are in bird droppings, they can sprout and grow, especially when they reach organic material, such as leaves, or water in your gutters after they wash away from the roofing when it rains. As the seeds sprout and grow inside your gutters, they can cause clogs to form. Clogged gutters can cause water to accumulate and back up into your roofing.
If the temperatures then drop below freezing, this water freezes and can create an ice dam. Ice can get underneath the shingles and cause them to lift up, which can allow more water to infiltrate through the roofing materials. After some time, this can lead to water leaks on the ceilings in your home as the water makes it way down through the roofing structures. You may also notice brown streaks on your siding, which is from water damage of the wood structures in your roofing.
Health Risks of Organisms in Bird Droppings
Bird droppings contain fungus that can pose health risks to you, your family, and your pets. Fungus in bird droppings can be carried in the air and inhaled into your lungs, which can cause histoplasmosis or cryptococcosis, depending on the type of fungus in the bird droppings. Histoplasmosis is an infection by a fungus found in the droppings of birds and bats in humid areas. It is not serious if confined to the lungs but can be fatal if spread throughout the body. Cryptococcosis is an infestation with a yeast-like fungus, resulting in tumors in the lungs and sometimes spreading to the brain. If birds are dropping their excrement onto your exterior HVAC unit, into or near the vents in your attic, or onto roofing that is extensively damaged, there's a risk that the fungus can get into the living quarters of your home.