Chapel Hill, NC
3 miles east
Median home built 1988, as in Carrboro; 63,565 people, about 3 times Carrboro's population
Attic insulation in Chapel HillAttic Insulation in Carrboro, NC
Blown-in attic insulation for Carrboro, NC, 3 miles from Chapel Hill, plus removal and air sealing.
About Carrboro and Its Homes
Carrboro grew up just west of Chapel Hill around a university railroad spur and Thomas Lloyd's Alberta Cotton Mill, built in 1898 and 1899. It was incorporated as Venable in 1911, renamed for mill owner Julian Carr in 1913, and stayed a small mill town until the late 1960s.
Carrboro, in Orange County, fell from 21,280 people in 2020 to 20,962 in 2025 (Census Bureau estimates), on 6.47 square miles. That makes Carrboro the second-largest town in Orange County.
Carrboro has about 10,200 housing units, 16 percent of Orange County's; 44 percent of the town's households own their home.
Carrboro at a Glance
- County: Orange County
- Population: 20,962 (2025), 21,280 (2020), down 1.5%
- Land area: 6.47 square miles (3,240 people each)
- Housing units: about 10,200 (±437)
- Median year built: 1988 (±2); Orange County: 1990
- Owner-occupied: 44% (±3); Orange County: 64%
- Detached houses: 42% (±3); Orange County: 59%
- Attached houses: 9% (±2)
- Apartments: 49% (±5)
- Climate zone: 4 (state code), 3 (2021 map)
- ENERGY STAR target for Carrboro attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)
Census Bureau estimates for Carrboro, 2020 to 2024 (± margin of error).
Carrboro Homes and Their Attics
Lloyd's Mill Houses on Maple Avenue and Carr Street
The Thomas F. Lloyd Historic District holds thirty frame houses, most of them built from 1910 to 1915 for workers at Lloyd's second mill, which Durham Hosiery Mills bought in 1913. Its nomination describes plain one-story houses on Carr Street, one room deep with a center hall, under triple-A roofs with rear ells and a central interior brick chimney. That center chimney rises through the attic floor, and the gap where it does lets warm house air rise past it. ENERGY STAR's answer is aluminum flashing set in high-temperature caulk, with a metal dam ringing the stack. Codes usually want insulation kept 2 inches back from masonry.
Stone Houses of the Northside Neighborhood
Northside, the historically African American neighborhood that spans the Carrboro and Chapel Hill line, has fieldstone houses built in the 1940s by the mason John Wesley Campbell and his sons. One of them, a story-and-a-half bungalow of 1945, was listed on the National Register in 2023. Its nomination notes that two small interior stone flues came out in the rehabilitation begun in 2022, when a new roof and heating and cooling system went in. Whenever a flue or chimney is removed from any older house, look at the attic floor where it stood. ENERGY STAR counts flue and duct chases among the larger air leaks, so any opening left behind is closed before insulating.
Attic Insulation in Carrboro
Some 17 percent of Carrboro's homes predate 1970; if your joists show above the insulation, ENERGY STAR says to add more insulation.
Built from 1970 to 1989, 40 percent of Carrboro homes may hold settled fiberglass; check its depth against the joists.
The Local Climate
Carrboro's center sits about 460 feet above sea level, under a mile from NOAA's Chapel Hill 2 W station, the best match for Carrboro. The station's 1991 to 2020 normals average about 3,500 heating and 1,610 cooling degree days a year, so at Carrboro's station, heating needs outweigh cooling.
Readings change over short distances around Carrboro: NOAA's Chapel Hill Williams Airport station, 2 miles away, averages about 3,240 heating degree days.
Homes by Age: What It Means for the Attic
Some 42 percent of Carrboro housing units are detached single-family houses.
From 1990 to 2009, 30 percent of Carrboro homes were built to codes below ENERGY STAR's target; check their eaves, where ENERGY STAR says insulation is often thinnest.
About 29 percent of Carrboro's housing units predate 1980; nearly all predate the state's 1978 insulation rule too. Some 49 percent of Carrboro units sit in buildings of two or more homes, where the attic is often shared. Renters hold 56 percent of Carrboro's occupied homes, so many attic decisions rest with landlords.
Homes by Year Built
- Before 1940: 1% (±1), about 140 units
- 1940s: 2% (±1), about 165 units
- 1950s: 5% (±2), about 530 units
- 1960s: 9% (±2), about 910 units
- 1970s: 12% (±3), about 1,180 units
- 1980s: 28% (±4), about 2,900 units
- 1990s: 15% (±2), about 1,560 units
- 2000s: 15% (±3), about 1,500 units
- 2010s: 12% (±2), about 1,220 units
- 2020 or later: 1% (±1), about 90 units
Air Sealing and Duct Sealing in Carrboro
In Carrboro, 63 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: 63% (±4), about 6,000 households; Orange County: 60%
- Piped gas: 35% (±3), about 3,300 households
Power, Gas and Rebates
Duke Energy serves most of Carrboro, Piedmont Electric Cooperative its edges; your bill says which. For gas, Carrboro is in the Orange County franchise of Enbridge Gas North Carolina, and 35 percent of the town's homes heat with piped gas. Duke's free House Call fits many Carrboro homes: 63 percent heat with electricity.
Rebate to check in Carrboro: Smart $aver Insulate and Seal (Duke Energy; Insulation Pros is an approved trade ally). Before a job in Carrboro, check its current terms; the Orange County page lists every program.
Attic Insulation Removal in Carrboro
In a Carrboro attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Carrboro attic is sanitized and deodorized; dry, clean insulation stays.
Also Serving Near Carrboro
Nearest to Carrboro first.
Hillsborough, NC
10 miles north
Median home built 2001 (Carrboro: 1988); 9,778 people, about half of Carrboro's population
Attic insulation in HillsboroughDurham, NC
11 miles east
Median home built 1995 (Carrboro: 1988); Its NOAA station logs about 250 more heating degree days than Carrboro's
Insulation contractor serving DurhamPittsboro, NC
14 miles south
Median home built 2002 (Carrboro: 1988); 5,054 people, about a quarter of Carrboro's population
Attic insulation in PittsboroMebane, NC
15 miles northwest
Median home built 2005 (Carrboro: 1988); Center about 210 feet higher than Carrboro's
Attic insulation in Mebane
Carrboro Insulation FAQs
Do Carrboro's National Register districts put rules on my house?
Not by themselves. The town's listings include the Thomas F. Lloyd and Carrboro Commercial historic districts and the Alberta Mill Complex. The state's preservation office says such a listing sets no conditions on an owner who keeps up or remodels a mill house or storefront with personal funds. Design review comes only from a local commission, and the 2023 state roster for Orange County shows Chapel Hill's, Hillsborough's and the county's, but none for Carrboro itself. If your house might be a designated landmark, check with the town before any outside change.
My Carrboro kitchen has a boxed-in soffit over the cabinets. Is that an attic problem?
Sometimes. Carrboro began growing with the university in the late 1960s, and this page's housing figures put the bulk of its homes in the years from 1970 on. If a house from those decades has a dropped soffit, insulation may be piled over it. The stud cavities inside can be open to the attic, so house air rises into them. Following ENERGY STAR, the insulation is pushed aside, the cavities are plugged and the soffit covered, and the insulation goes back on top. That sealing comes first, before we blow in anything new.
Does attic insulation in Carrboro need a permit?
Carrboro Town Hall can say whether Orange County Planning & Inspections, the town itself or another office handles permits in Carrboro; ask before work starts.
Helpful Guides
- Power from Duke Energy: high summer electric bills and home energy audits
Sources
Census Bureau figures for Carrboro, NOAA normals for the Chapel Hill 2 W station, Duke Energy (October 2026). Compiled by Insulation Pros. How the town pages are made.
Sources for the Carrboro notes and questions (read October 20, 2026):
- History of Carrboro, Town of Carrboro
- Carrboro Walking Tour, Town of Carrboro
- Carrboro, in The North Carolina Gazetteer (William S. Powell, 2nd ed., UNC Press 2010), NCpedia
- Thomas F. Lloyd Historic District, National Register nomination (NC HPO)
- Furnace Flues Require Special Sealing Techniques, ENERGY STAR do-it-yourself guide
- Jeter and Ethel Neville House, National Register nomination, 2023 (NC HPO)
- Attic Air Sealing Project, ENERGY STAR
- NC Listings in the National Register of Historic Places, NC State Historic Preservation Office
- What Is the National Register of Historic Places?, NC State Historic Preservation Office
- Historic Preservation Commission Staff in North Carolina, listed by county, as of 2/20/2023 (NC HPO)
- Year Structure Built (table B25034), Carrboro town, American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau via Census Reporter
- Sealing Air Leaks in the Attic, ENERGY STAR do-it-yourself guide
Carrboro, NC
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Insulation Pros is an insulation contractor serving North Carolina, Carrboro and the rest of Orange County included.
Reach us
Send the square footage of your Carrboro attic, or call (336) 870-3893.