Chimney Services in Jackson, NJ

What the numbers suggest for chimneys in Jackson

Census estimates count 21,943 housing units in Jackson. About 23% were built in the 1960s and 1970s, 35% from 1980 to 1999 and 33% since 2000, with only about 10% older than that. Houses from the earlier decades are more likely to have masonry chimneys, while the later ones add factory-built fireplaces with metal chimney pipe inside a framed chase. Either type can end up the wrong height when the roof around it changes.

Among the 20,633 occupied homes, roughly 83% burn utility gas for heat, 8% burn fuel oil and 7% use electricity. A given gas furnace or water heater might exhaust into a masonry flue, through a metal B-vent or out a sidewall, so the fireplace is not always the only appliance tied to the chimney. Our guide to direct-vent, B-vent and vent-free appliances explains the differences.

About 76% of units are detached houses, 6% are attached and 10% sit in complexes of five units or more. Treat the numbers as a portrait of Jackson, not a report on your own chimney.

Why a roof change can make a chimney too short

The model residential code gives two height tests, and a chimney has to pass both. Measured from where it comes through the roof, the top must stand 3 feet or more above the roofline at that spot. And it must clear by at least 2 feet anything belonging to the building that lies within a 10-foot radius. Our guide to chimney height and the 3-2-10 rule walks through how it is measured.

The second condition is the one an addition usually affects. Picture a ranch house, as an illustration only, with a fireplace chimney rising 3 feet through the roof near the ridge. The owners add a second story whose new wall stands 8 feet from the chimney. The chimney did not change, but the house now has a part within 10 feet that rises above it, so the chimney must be extended until it stands 2 feet higher than that new wall. A steeper replacement roof or a dormer built close to the chimney can do the same thing on a smaller scale.

A height shortfall matters for more than paperwork. A short chimney sits in the turbulent air around the taller roof, which can push smoke back down the flue on windy days and leave sparks closer to the roof surface.

Settling the chimney question while the addition is on paper

1. Mark the chimney on the plansAsk your designer to show the chimney's top and the 10-foot zone around it on the elevation drawings. If the new roof or wall rises into that zone, the plans should say how the chimney will be extended or rerouted.
2. Find out what the chimney isA masonry chimney is extended with new masonry and a longer flue liner. A factory-built chimney is extended with listed pipe sections from the same system, following its manufacturer's instructions. An inspection identifies the type, the flue's condition and the crown or chase top before anyone designs around it.
3. Check every flue, not just the fireplaceIf a furnace or water heater also vents through the chimney, its flue has to meet the same height rule after the addition. Tell your heating contractor about the change.
4. Plan the roof tie-inNew roofing around an extended chimney needs new flashing, and a wide chimney on the uphill side may need a cricket. The guide to planning chimney work around a roof replacement covers the order of trades.
5. Wait to light the first fireUse the fireplace or stove again only after the extension is finished and the flue has been checked. Construction dust and debris can fall into an open flue.

What an extension involves

For a masonry chimney in sound condition, the usual route is to build the stack higher with matching brick, extend the flue liner to the new top and form a new crown. If the upper courses are already deteriorated, it can make more sense to take the top down and rebuild it to the new height in one step. Where a tall masonry extension would be heavy or exposed, a properly sized stainless steel liner carried above the masonry is sometimes part of the answer, depending on the appliance and the chimney.

We start with an assessment and give you findings with photos, including measurements to the new roof, before any work is scheduled. Additions and chimney alterations generally need construction permits, so coordinate the chimney work with your contractor and ask the township's construction office what applies.

Local questions

Sources

1. U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25034, B25040, B25024), via Census Reporter
2. 2003 International Residential Code, Chapter 10, Chimneys and Fireplaces (text reproduced by Buckley Rumford Fireplaces)