What Tree Trimming Services Do to Stop Branches From Hitting Roofs Why roof hits happen—and how to stop them: Branches lean toward light and space. As they grow, they creep over shingles and vents. Then storms push them harder. Soon, twigs scrape granules off shingles. After that, bigger limbs start to rub and crack at the edges. Moist leaves also trap water, which leads to moss and leaks—so, fast, smart care matters. With tree trimming services in...