Attic Insulation in Selma, NC

Blown-in attic insulation for Selma, NC, in Johnston County, plus removal and air sealing.

About Selma and Its Homes

Selma began as a stop on the North Carolina Railroad in 1867 and became a rail junction in 1886. Its three cotton mills, opened between 1904 and 1910, each built a worker village, so its older houses range from merchants' Queen Anne homes to mill cottages, bungalows and brick ranches.

Selma, in Johnston County, grew from 6,362 people in 2020 to 7,406 in 2025 (Census Bureau estimates), on 5.41 square miles. That makes Selma the third-largest town in Johnston County.

Selma has about 3,400 housing units, 4 percent of Johnston County's; about 43 percent of the town's households own their home.

Two-story brick storefronts lining a downtown street in Selma, with the water tower in the distance
Downtown Selma, North Carolina Photo: Indy beetle, CC0, via Wikimedia Commons

Selma at a Glance

  • County: Johnston County
  • Population: 7,406 (2025), 6,362 (2020), up 16.4%
  • Land area: 5.41 square miles (1,369 people each)
  • Housing units: about 3,400 (±322)
  • Owner-occupied: 43% (±8); Johnston County: 76%
  • Detached houses: 60% (±9); Johnston County: 76%
  • Attached houses: 8% (±5)
  • Apartments: 24% (±9)
  • Mobile homes: 7% (±4)
  • Climate zone: 3 on both maps
  • ENERGY STAR target for Selma attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)

Census Bureau estimates for Selma, 2020 to 2024 (± margin of error).

Selma Homes and Their Attics

Mill Villages of the Lizzie and Ethel Mills

The Selma Cotton Mills opened in 1904, the Lizzie in 1907 and the Ethel in 1910, and each housed its own workers. The town's 1982 historic resources study describes those mill cottages as very modest, mostly one story, put up from about 1900 to 1910. In the early 1920s the mills competed for hands with newspaper ads that offered free rent with electric lights. A 2011 nomination counts about twenty mill houses in the Lizzie village east of downtown. Wiring that went into a village around then can still be knob-and-tube. An electrician checks it before insulation is blown in, because ENERGY STAR calls old wiring like that a fire hazard where insulation touches it.

Brick Ranches in West Selma

West Selma, listed in 2011, is the only largely residential historic district in town. Its nomination traces houses from about 1880 to 1961. It notes a large group of ranches, the first built in 1944, with the form lasting into the 1970s and growing plainer as it went. Postwar Minimal Traditional houses of one or one-and-a-half stories stand there too. A ranch keeps its roof low, so the attic pinches down to a few inches where the rafters meet the outside walls. That edge is where insulation and airflow collide. Rafter vents, or baffles, hold a channel open above the soffit vents so the attic floor can be covered all the way out without blocking them.

Attic Insulation in Selma

About 45 percent of Selma's homes predate 1970; if your joists show above the insulation, ENERGY STAR says to add more insulation.

Built from 1940 to 1969, about 35 percent of Selma homes often have little insulation.

The Local Climate

Selma's center sits about 180 feet above sea level, 4 miles from NOAA's Smithfield station, the best match for Selma. The station's 1991 to 2020 normals average about 3,080 heating and 1,870 cooling degree days a year, so at Selma's station, heating needs outweigh cooling.

Readings change over short distances around Selma: NOAA's Clayton Water Plant station, 12 miles away, averages about 3,390 heating degree days.

Homes by Age: What It Means for the Attic

About 60 percent of Selma housing units are detached single-family houses.

Built from 1970 to 1989, about 25 percent of Selma homes may hold settled fiberglass; check its depth against the joists.

About 55 percent of Selma's housing units predate 1980; nearly all predate the state's 1978 insulation rule too. Renters hold about 57 percent of Selma's occupied homes, so many attic decisions rest with landlords.

Homes by Year Built

  • Before 1940: 10% (±5), about 340 units
  • 1940s: 5% (±3), about 175 units
  • 1950s: 24% (±10), about 820 units
  • 1960s: 7% (±3), about 240 units
  • 1970s: 9% (±3), about 290 units
  • 1980s: 18% (±7), about 600 units
  • 1990s: 11% (±4), about 360 units
  • 2000s: 6% (±3), about 195 units
  • 2010s: 6% (±4), about 205 units
  • 2020 or later: 4% (±4), about 145 units

Air Sealing and Duct Sealing in Selma

In Selma, about 77 percent of homes heat with electricity; where that heat is forced air, ducts often run through the attic.

Air sealing comes first, as the EPA advises: wire and pipe holes, wall tops and soffits.

How Homes Here Are Heated

  • Electricity: 77% (±7), about 2,400 households; Johnston County: 78%
  • Piped gas: 13% (±5), about 400 households
  • Bottled or tank gas: 7% (±5), about 205 households
  • Oil or kerosene: under 6%, about 90 households

Power, Gas and Rebates

Selma, an ElectriCities public power town, runs its own electric system. For gas, Selma is in the Johnston County franchise of Piedmont Natural Gas, and 13 percent of the town's homes heat with piped gas.

Program to ask about in Selma: ElectriCities energy audits (the town's electric system), home energy audits for member-town customers; ask the town's utility office. Before a job in Selma, check its current terms; the Johnston County page lists every program.

Attic Insulation Removal in Selma

In a Selma attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Selma attic is sanitized and deodorized; dry, clean insulation stays.

Also Serving Near Selma

Nearest to Selma first.

Every town in Johnston County. See all service areas.

Selma Insulation FAQs

Does living in West Selma or downtown Selma limit work on my attic?

No. Both are on the National Register, and the preservation office says that status puts no duty or limit on a private owner who pays for the work. The same office's 2023 roster of town preservation commissions has no entry for Selma, so there is no local design review on record. Blowing insulation into the attic and sealing its floor never touch the outside anyway. If a job ever calls for new roof vents, call the town first to be sure nothing has changed.

Did the mills insulate the houses in Selma's mill villages?

Nothing on record says they did, and no law asked them to. The cottages went up in the first decade of the 1900s. State law only began holding new houses to insulation standards before anyone moved in for construction started from January 1, 1978. So any insulation in a mill house attic now most likely came later, if anyone added it at all. We look over the main roof and any back addition separately, measure what is there, and check the wiring before adding anything.

Could the old insulation in a Selma attic be vermiculite?

It could: about 40 percent of Selma's homes predate 1960. If a Selma attic holds a pebble-like gray-brown or silver-gold fill, leave it undisturbed: the EPA says vermiculite may contain asbestos.

Does attic insulation in Selma need a permit?

Selma Town Hall can say whether Johnston County Building Inspections Department, the town itself or another office handles permits in Selma; ask before work starts.

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Serving Selma, NC

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