Spring and Summer Bring Pesky Animals into Chimneys

Birds nest inside chimneys where they can cause problems Birds look for dark and safe places to nest and lay eggs in the spring and an open chimney can be an irresistible location for expecting bird parents.

Unfortunately for homeowners, nesting birds inside chimneys can mean big problems. Besides the obvious fire hazard from flammable nests, there may be the constant annoying chirping of baby birds.  And perhaps not so obvious, the health hazard from bird droppings which can contain the disease histoplasmosis.

Squirrels and raccoons also like to keep house inside chimneys and these creatures can cause even more havoc for homeowners. Squirrels are noisy and build large nests that block flues, and raccoons carry roundworm and rabies. If either escapes into the house through a damper, , they may damage the interior of the house.

Therefore, it is best to stop birds, squirrels, and raccoons from entering masonry or prefabricated chimneys in the first place. This can be accomplished by having a heavy duty stainless steel chimney cover with bird screen installed on top of the flue liner of a masonry chimney, or a proper cover installed on a prefabricated chimney pipe. Some older prefabricated chimney pipe covers were not adequately designed to keep birds out of the inner and outer chimney walls, making this type of pipe an even more serious fire hazard.  The addition of a screen in this area will stop the birds from entering but any nesting materials should be removed if found between the chimney walls.

According to the National Chimney Sweep Guild and Midwest Chimney Safety Council, all chimneys should be inspected annually and swept as necessary by a CSIA Certified Chimney Sweep. During the inspection, the sweep will look for nesting materials, dead birds, flammable creosote, and other issues and remove them. Chimney sweeps can install chimney covers that will keep birds and other animals out of flues. Covers come in different sizes and shapes such as individual covers to fit on a single flue or multi-flue covers that cover two or more flues.

It is important to get a chimney cover installed in early spring before birds and squirrels start to nest.  According to the Migratory Bird Act, no nesting birds may be removed from chimneys, and to do so can result in a hefty fine for the homeowner and chimney sweep. If birds do get in a chimney flue before a cap is installed homeowners need to wait until the birds leave in order to have the flue cleaned out and a chimney cover installed. The MCSC advises against using inexpensive black steel chimney covers found at box stores because they rust and stain the chimney. Stainless steel chimney covers are long-lasting, are a deterrent to animals such as squirrels and raccoons, and will never rust. For these reasons it is worth the extra expense to purchase stainless steel chimney covers rather than black steel covers. 
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Marge Padgitt is the CEO of HearthMasters, Inc. in Kansas City Missouri. The company designs and builds and maintains masonry heater, brick ovens, chimneys, and fireplaces. Marge is the author of the Chimney and Hearth Pro's Resource Book and others.