Staley, NC
7 miles northwest
405 people, under a tenth of Siler City's population
Attic insulation in StaleyAttic Insulation in Siler City, NC
Blown-in attic insulation for Siler City, NC, in Chatham County, plus removal and air sealing.
About Siler City and Its Homes
Siler City began as Matthews Cross Roads, where two plank roads met, and took off after the Cape Fear and Yadkin Valley Railway put a depot here in 1884. For the older streets east of downtown, a 1999 nomination records Queen Anne and Gothic Revival houses, Sears kit bungalows and later ranch houses.
Siler City, in Chatham County, grew from 7,761 people in 2020 to 8,155 in 2025 (Census Bureau estimates), on 6.05 square miles. No town in Chatham County has more people than Siler City.
Siler City has about 3,300 housing units, 9 percent of Chatham County's; about 56 percent of the town's households own their home.
Siler City at a Glance
- County: Chatham County
- Population: 8,155 (2025), 7,761 (2020), up 5.1%
- Land area: 6.05 square miles (1,348 people each)
- Housing units: about 3,300 (±318)
- Owner-occupied: 56% (±9); Chatham County: 81%
- Detached houses: 55% (±8); Chatham County: 77%
- Attached houses: 2% (±2)
- Apartments: 23% (±8)
- Mobile homes: 20% (±9)
- Climate zone: 4 (state code), 3 (2021 map)
- ENERGY STAR target for Siler City attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)
Census Bureau estimates for Siler City, 2020 to 2024 (± margin of error).
Siler City Homes and Their Attics
Two-Story Frame Houses East of Downtown
When Siler City was incorporated in 1887, the land east and northeast of downtown was still mostly farmland. From the 1890s on, doctors, lawyers and merchants built there. The nominations for the East Raleigh Street and North Third Avenue districts describe their two-story frame houses. Triple-A, Queen Anne and Colonial Revival designs run from about 1890 to the First World War. If a frame house of that age was balloon framed, its wall cavities can rise straight into the attic with no top plate to stop warm air. Each open stud bay is closed off from above, and only then is insulation added.
Sears Kit Bungalows on East Second Street
The 1999 nomination for the East Raleigh Street district identifies several Sears, Roebuck and Company houses on East Second Street, dating from about 1915 to 1920. They were precut kits, shipped by rail and put together on the lot. Its inventory describes each as a story-and-a-half bungalow with a side-gable roof and a dormer. In a house shaped like that, the upstairs rooms are tucked into the roof, and short knee walls hide wedge-shaped side attics. ENERGY STAR lists the open framing under and behind knee walls with the leaks worth plugging first. So the work covers those narrow side spaces, not just the attic above the upstairs ceiling.
Attic Insulation in Siler City
About 45 percent of Siler City's homes predate 1970; if your joists show above the insulation, ENERGY STAR says to add more insulation.
From 1990 to 2009, about 40 percent of Siler City homes were built to codes below ENERGY STAR's target; check their eaves, where ENERGY STAR says insulation is often thinnest.
The Local Climate
Siler City's center sits about 610 feet above sea level, 3 miles from NOAA's Siler City 2 N station, the best match for Siler City. The station's 1991 to 2020 normals average about 3,500 heating and 1,500 cooling degree days a year, so at Siler City's station, heating needs outweigh cooling.
Homes by Age: What It Means for the Attic
About 55 percent of Siler City housing units are detached single-family houses, about 20 percent mobile homes.
Built from 1940 to 1969, about 35 percent of Siler City homes often have little insulation.
About 50 percent of Siler City's housing units predate 1980; nearly all predate the state's 1978 insulation rule too.
Homes by Year Built
- Before 1940: 9% (±6), about 285 units
- 1940s: 3% (±2), about 105 units
- 1950s: 24% (±7), about 790 units
- 1960s: 8% (±3), about 260 units
- 1970s: 6% (±3), about 195 units
- 1980s: 9% (±5), about 285 units
- 1990s: 18% (±6), about 580 units
- 2000s: 20% (±8), about 680 units
- 2010s: 4% (±3), about 125 units
- 2020 or later: under 1%
Air Sealing and Duct Sealing in Siler City
In Siler City, about 68 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: 68% (±6), about 2,100 households; Chatham County: 50%
- Piped gas: 27% (±9), about 800 households
- Bottled or tank gas: 1% (±1), about 35 households
- Oil or kerosene: under 8%, about 120 households
Power, Gas and Rebates
Duke Energy supplies Siler City's electricity. For gas, Siler City is in the Chatham County franchise of Enbridge Gas North Carolina, and about 27 percent of the town's homes heat with piped gas. Duke's free House Call fits many Siler City homes: about 68 percent heat with electricity.
Rebate to check in Siler City: Smart $aver Insulate and Seal (Duke Energy; Insulation Pros is an approved trade ally). Before a job in Siler City, check its current terms; the Chatham County page lists every program.
Attic Insulation Removal in Siler City
In a Siler City attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Siler City attic is sanitized and deodorized; dry, clean insulation stays.
Also Serving Near Siler City
Nearest to Siler City first.
Liberty, NC
11 miles northwest
Center about 180 feet higher than Siler City's; 2,739 people, about a third of Siler City's population
Attic insulation in LibertyRamseur, NC
11 miles west
1,806 people, about a fifth of Siler City's population
Attic insulation in RamseurGoldston, NC
12 miles southeast
Center about 190 feet lower than Siler City's; Its NOAA station logs about 320 fewer heating degree days than Siler City's
Attic insulation in GoldstonFranklinville, NC
13 miles west
1,256 people, about a sixth of Siler City's population
Attic insulation in Franklinville
Siler City Insulation FAQs
Does a National Register district in Siler City limit work on my house?
Not by itself. The town has three listed districts, East Raleigh Street, North Third Avenue and the downtown commercial district, plus several buildings listed one by one. In the words of the State Historic Preservation Office, being on the Register sets no limits for an owner who uses private funds. The state's roster of local preservation commissions, dated 2023, has no Chatham County entry. Air sealing and insulating the attic are indoor jobs in any case.
How close can attic insulation come to the old brick chimneys in town?
It should never touch them. The district nominations record interior brick chimneys in several of the older houses, one house of 1916 having three. Where a chimney rises through the attic floor, ENERGY STAR says to bridge the opening with light aluminum and seal its edges with a high-heat caulk. A sheet-metal dam then holds the insulation back, keeping the 2 inch gap that codes commonly set for masonry.
Could the old insulation in a Siler City attic be vermiculite?
It could: about 35 percent of Siler City's homes predate 1960. If a Siler City 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 Siler City need a permit?
Siler City Town Hall can say whether Chatham County Building Inspections, the town itself or another office handles permits in Siler City; ask before work starts.
Helpful Guides
- Power from Duke Energy: high summer electric bills and home energy audits
Sources
Census Bureau figures for Siler City, NOAA normals for the Siler City 2 N station, Duke Energy (October 2026). Compiled by Insulation Pros. How the town pages are made.
Sources for the Siler City notes and questions (read October 20, 2026):
- Siler City, in The North Carolina Gazetteer (William S. Powell, 2nd ed., UNC Press 2010), NCpedia
- East Raleigh Street Historic District, National Register nomination (NC HPO)
- North Third Avenue Historic District, National Register nomination (NC HPO)
- Building Construction Problem Areas, weatherization training text, Iowa Department of Health and Human Services
- 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)
- Furnace Flues Require Special Sealing Techniques, ENERGY STAR do-it-yourself guide
Siler City, NC
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Insulation Pros is an insulation contractor serving North Carolina, Siler City and the rest of Chatham County included.
Reach us
Send the square footage of your Siler City attic, or call (336) 870-3893.