Duncan crews pick up brush and limbs year round as long as each piece is under six feet long, which is a reminder of how much tree debris ends up at the curb after a windy week. A limb that strikes a roof on the way down can bend a cap screen, knock a cap loose, or crack the mortar crown the cap sits on.
From the ground, look for a cap that sits crooked, a screen torn or rusted open, a missing cap, or rust streaks on the brick below it. Inside, watch for water in the firebox after rain, twigs on the grate, or scratching in the chimney.
Please do not climb up to check; a photo from the yard is enough. If you hear an animal in the flue, keep the damper closed, do not light a fire to drive it out, and call us. Some cases need a licensed wildlife removal company before a cap goes on.