Chimney Services in Roxbury, NJ

What the numbers suggest for chimneys in Roxbury

Census estimates date about 36% of Roxbury's 8,465 housing units to the 1960s and 1970s, the biggest single era in the township. Another 25% were built from 1980 to 1999, 17% from 1940 to 1959 and 12% before 1940. A chimney built in 1965 has now been heating a house for about six decades, which means decades of heating seasons for whatever lines its flue.

Utility gas is the main fuel in about 60% of occupied homes and fuel oil in 28%; electricity (6%) and propane (4%) make up most of the rest. Both fuels matter to a clay flue. CSIA explains that sulfur in oil soot, mixed with moisture, soaks into flue tile and starts it flaking, and the water vapor in gas exhaust can turn to liquid on a cool flue wall, a process our guide to chimney condensation covers.

Detached houses make up about 82% of the stock, and apartment or condo buildings with five or more units about 10%. None of this tells you the condition of any one flue; only an inspection does that.

From camera footage to a decision: a branching sequence

Cracked flue tiles are almost never visible from the fireplace or the boiler room. A Level 2 inspection, as CSIA defines it, scans the inside of the flue on video, surfaces and joints alike, and every step below depends on that footage.

1. Is the flue lined at all?If the camera shows bare brick with no tile, there is nothing to resurface. Go to step 5.
2. Are the tiles still in place?If sections are broken out, offset or missing, a new liner is the usual path. Go to step 5. If the tiles are whole and aligned, continue.
3. What kind of damage is it?Gaps at the mortar joints, hairline cracks and light surface flaking are the kind of damage a resurfacing system is designed to address. Continue to step 4.
4. Does the flue size still suit the appliance?Resurfacing keeps the existing size. When a new heating appliance is installed or planned and its manual specifies a different flue size, go to step 5. If the size suits, resurfacing is a candidate.
5. New liner.A stainless steel, cast-in-place or new clay liner is sized to the appliance and installed in the chimney. Our liner options guide compares them.

What resurfacing a clay flue involves

HeatShield is a ceramic resurfacing system for clay-lined flues in masonry chimneys. The manufacturer's testing page says it is listed to UL Standard 1777 as a chimney liner system and suits clay-lined flues venting the gas, oil or wood appliances found in most homes. It is applied inside the existing tiles, either at the joints or over the whole surface, depending on the damage. A follow-up camera pass shows the result. Our flue repair page covers how we handle joint repair and full resurfacing.

The comparison in our guide to HeatShield versus a new liner goes further into prerequisites for each approach.

A note for oil-heated homes

With 28% of Roxbury households on oil, the fuel deserves its own mention. CSIA notes that even a stainless steel liner, which will not rust, can corrode from the sulfuric acid in oil soot until small pinholes form. Whichever route you choose, the repaired or new flue still needs the yearly sweeping and inspection that oil service calls for, and the flue is swept before any camera work so the footage shows tile and not soot.

Local questions

Sources

1. U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25034, B25040, B25024), via Census Reporter
2. CSIA: The Three Levels of Chimney Inspections
3. HeatShield: Technology and Testing
4. CSIA: Annual Service of Your Oil-Fired Appliance Chimney