Chimney Services in Dumont, NJ

What the numbers suggest for chimneys in Dumont

Census estimates put about 24% of Dumont's 6,768 housing units in buildings from 1939 or earlier and 47% in buildings from 1940 to 1959, so about seven in ten homes predate 1960. A masonry chimney from those years may carry one flue or several. Our guide to the parts of a chimney shows where the cap sits relative to the crown and flue tiles.

Heating is mostly utility gas, at about 84% of occupied homes, followed by electricity at 10%, fuel oil at 3% and propane at 2%. A flue that serves a gas furnace or water heater needs a cap or termination that lets exhaust out freely, which is one reason cap choice depends on what each flue serves.

About 70% of units are detached houses. Another 13% are in two-to-four-unit buildings and 14% in buildings of five or more units, where the building's owner would normally decide on caps and other roof work.

Four questions that decide which cap fits

1. How many flues are there, and how close are they?

Guidance from the Internet Center for Wildlife Damage Management suggests that when two flues sit closer than 6 inches apart, a single multi-flue cap covering both is the practical choice. Flues spaced farther apart can each take their own cap, as our guide to multi-flue chimneys explains.

2. What is the cap made of?

The same source recommends commercial stainless steel caps and notes that galvanized caps, popular years ago, break down from rust. A rusted cap can also stain the crown and brick below it.

3. How does it attach?

A cap that clamps to the flue tile needs enough tile above the crown to grip. The same guidance notes that a cap with legs is needed when the flue lip stands less than an inch high. Caps that cover the whole crown attach differently. Our comparison of chimney cap types walks through the options.

4. What does each flue serve?

A fireplace flue, a gas furnace flue and an unused flue have different needs. A cap must never restrict a flue that vents a working appliance, so the inspection notes which flue does what before anything is ordered.

For a fireplace flue there is one more choice. Some designs combine a cap with a top-sealing damper that closes the flue at the top when the fireplace is not in use. If the fireplace below has a rusted or stuck throat damper, that combination is worth weighing; our guide to throat and top-sealing dampers compares them.

Timing a cap around wildlife

Caps are often installed after an animal problem, and timing matters. The wildlife guidance above warns that in spring a raccoon may be raising young above the damper, so a cap should not seal them inside. It also advises against covering a flue with hardware cloth, which rusts and can catch snow.

Our own technicians handle chimney animal removal humanely and in line with New Jersey wildlife rules. Chimney swifts are a protected species, and an active swift nest stays until the birds leave. The cap goes on after the chimney is clear.

Local questions

Sources

1. U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25034, B25040, B25024), via Census Reporter
2. Internet Center for Wildlife Damage Management: Chimney Cap