The most common questions we get asked by our customers is “How do the animals get on my roof?” and “How can I keep them from getting on my roof?"
The simple answers to these questions are “If they want to get on your roof they will find a way.” and “It is next to impossible to keep them off your roof.”
The fact of the matter is that all animals are opportunistic and they are going to seek out roofs that are the easiest to climb on to. Therefore, if your house has tree branches overhanging the roof or vines growing on the walls then you can be guaranteed to have animals climbing all over the roof looking for a way to break into the attic.
While we have often witnessed raccoons and squirrels climbing the downspouts and even the brick walls to get on the roof, homeowners can still take steps to minimize the "animal traffic” on their roof by removing overhanging branches and vines. If it easier for the neighbourhood critters to get onto your neighbours roof than it is for them to get on yours, then you ultimately will decrease your chances of having a future wildlife problem.
Having said that, please do not go to the extent of removing the trees around your home thinking you can solve an existing wildlife problem. I had a customer a few years ago spend $3,000 to cut down 3 very large maple trees that were overhanging his roof. His thinking was, if the trees were gone then his raccoon problem in his attic would also be gone. He quickly learned that the mother raccoon would not miss a beat and resort to climbing the downspouts, continuing to live in the attic with her 2 week old babies.
Just as the old adage states, an ounce of prevention is worth a pound of cure!