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Cary, NC
4 miles south
Median home built 1999 (Morrisville: 2007); Center about 200 feet higher than Morrisville's
Attic insulation in CaryAttic Insulation in Morrisville, NC
Blown-in attic insulation for Morrisville, NC, 4 miles from Cary, plus removal and air sealing.
About Morrisville and Its Homes
Morrisville grew up around a North Carolina Railroad station on Crabtree Creek in the 1850s. Its old depot village of I-houses and workers' cottages is small, and from 1990 on, with the airport and Research Triangle Park next door, the town has filled with newer homes.
Morrisville, in Wake County, grew from 30,106 people in 2020 to 32,466 in 2025 (Census Bureau estimates), on 9.17 square miles.
Morrisville has about 13,500 housing units, 3 percent of Wake County's; 45 percent of the town's households own their home.
Morrisville at a Glance
- County: Wake County
- Population: 32,466 (2025), 30,106 (2020), up 7.8%
- Land area: 9.17 square miles (3,540 people each)
- Housing units: about 13,500 (±580)
- Median year built: 2007 (±2); Wake County: 2000
- Owner-occupied: 45% (±4); Wake County: 64%
- Detached houses: 33% (±2); Wake County: 58%
- Attached houses: 23% (±5)
- Apartments: 43% (±5)
- Climate zone: 4 (state code), 3 (2021 map)
- ENERGY STAR target for Morrisville attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)
Census Bureau estimates for Morrisville, 2020 to 2024 (± margin of error).
Morrisville Homes and Their Attics
I-Houses and Cottages of the Depot Village
The town's historic core is about twenty-five buildings from about 1870 to 1941, around the crossing of Chapel Hill Road, Morrisville-Carpenter Road and the railroad. Three farming and merchant families built two-story I-houses there in the 1870s and 1880s, the 2012 church nomination says. The railroad put up plain one-story cottages for its workers, and a hosiery mill added more in the 1910s. The Williamson Page House shows how such houses grew: a front section said to date from about 1830, a stair hall of about 1876 and a two-story rear ell. When a Morrisville house was assembled over half a century, every added piece can carry a separate roof, a separate little attic and a different depth of old fill. On install day the crew finds each one and measures it before adding to any.
Homes Built Since the Airport Boom
Morrisville has grown fast from 1990 on, wedged between Raleigh-Durham International Airport and Research Triangle Park, the 2012 Page House nomination notes. Most of its buildings date from after the 1980s, and the age figures for local housing elsewhere on this page tell the same story. In a house of that age with a gas furnace or water heater, a metal flue may climb through the attic. ENERGY STAR notes that codes usually call for one inch of clear space around a metal flue. Where the pipe pierces the ceiling, the opening is covered with aluminum flashing and sealed with caulk made for high temperatures, and a small metal dam keeps the insulation back.
Attic Insulation in Morrisville
If the joists show above the insulation in a Morrisville attic, ENERGY STAR says to add more insulation.
From 1990 to 2009, 53 percent of Morrisville homes were built to codes below ENERGY STAR's target; check their eaves, where ENERGY STAR says insulation is often thinnest.
The Local Climate
Morrisville's center sits about 300 feet above sea level, 5 miles from NOAA's Raleigh-Durham International Airport station, the best match for Morrisville. The station's 1991 to 2020 normals average about 3,150 heating and 1,800 cooling degree days a year, so at Morrisville's station, heating needs outweigh cooling.
Homes by Age: What It Means for the Attic
Some 33 percent of Morrisville housing units are detached single-family houses.
In 2010 or later, 37 percent of Morrisville homes went up; check their air sealing as well as the depth.
Some 43 percent of Morrisville units sit in buildings of two or more homes, where the attic is often shared. Renters hold 55 percent of Morrisville's occupied homes, so many attic decisions rest with landlords.
Homes by Year Built
- Before 1940: under 1%, about 65 units
- 1940s: under 1%, about 50 units
- 1950s: under 1%, about 90 units
- 1960s: under 1%, about 25 units
- 1970s: 1% (±1), about 125 units
- 1980s: 7% (±2), about 1,010 units
- 1990s: 14% (±3), about 1,870 units
- 2000s: 39% (±4), about 5,300 units
- 2010s: 31% (±4), about 4,200 units
- 2020 or later: 6% (±2), about 760 units
Air Sealing and Duct Sealing in Morrisville
In Morrisville, 52 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: 52% (±4), about 6,400 households; Wake County: 55%
- Piped gas: 46% (±4), about 5,700 households
Power, Gas and Rebates
Duke Energy supplies Morrisville's electricity. For gas, Morrisville is in the Wake County franchise of Enbridge Gas North Carolina, and 46 percent of the town's homes heat with piped gas. Duke's free House Call fits many Morrisville homes: 52 percent heat with electricity.
Rebate to check in Morrisville: Smart $aver Insulate and Seal (Duke Energy; Insulation Pros is an approved trade ally). Before a job in Morrisville, check its current terms; the Wake County page lists every program.
Attic Insulation Removal in Morrisville
In a Morrisville attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Morrisville attic is sanitized and deodorized; dry, clean insulation stays.
Also Serving Near Morrisville
Nearest to Morrisville first.
Apex, NC
8 miles south
Median home built 2008 (Morrisville: 2007); Power from its own town system (Morrisville: Duke Energy)
Attic insulation in ApexDurham, NC
10 miles north
Median home built 1995 (Morrisville: 2007); Its NOAA station logs about 600 more heating degree days than Morrisville's
Insulation contractor serving DurhamRaleigh, NC
11 miles east
Median home built 1997 (Morrisville: 2007); 506,306 people, about 16 times Morrisville's population
Insulation contractor serving Raleigh
Morrisville Insulation FAQs
Is there a historic district in Morrisville that covers my house?
No. Morrisville has three individual National Register listings, the former Morrisville Christian Church, the Williamson Page House and the Pugh House, but no listed district. A small district was found eligible in 1992 and was not listed because of owner objections. In 1999 it was judged ineligible after too many changes. The town bought the Pugh House in 2007 to keep it from being torn down. For other houses, attic work involves no historic review.
Our Morrisville home is less than thirty years old. Did it have to meet an insulation standard?
It should have. North Carolina law bars moving into a home whose construction began in 1978 or after until it passes the state insulation standards, wherever local officials enforce them. That approval speaks to the day the house was finished. The statute says nothing about air leaks into the attic, and twenty-odd years of cable, alarm and heating work can disturb what was laid down. We check both the depth and the sealing.
Who checks the wiring in an old cottage near the Morrisville depot?
An electrician, before any insulation goes in. The railroad cottages and hosiery mill houses near the crossing date from the late nineteenth century and the 1910s. ENERGY STAR says knob-and-tube wiring in homes wired before 1930 can turn into a fire hazard if insulation is heaped over it. Where some still works, the electrician takes care of it first, and we leave that area open until the work is done.
Does attic insulation in Morrisville need a permit?
Morrisville Town Hall can say whether Wake County Permits and Inspections, the town itself or another office handles permits in Morrisville; ask before work starts.
Helpful Guides
- Median home built 2007: a hot upstairs and bonus rooms over garages
- Power from Duke Energy: high summer electric bills and home energy audits
Sources
Census Bureau figures for Morrisville, NOAA normals for the Raleigh-Durham International Airport station, Duke Energy (October 2026). Compiled by Insulation Pros. How the town pages are made.
Sources for the Morrisville notes and questions (read October 20, 2026):
- Morrisville, in The North Carolina Gazetteer (William S. Powell, 2nd ed., UNC Press 2010), NCpedia
- Pugh House, National Register nomination (NC HPO, listed 2014 at its new site)
- Williamson Page House, National Register nomination (NC HPO, listed 2012)
- Morrisville Christian Church (former), National Register nomination (NC HPO, listed 2012)
- Adding Attic Insulation, ENERGY STAR do-it-yourself guide
- Year Structure Built (table B25034), Morrisville town, American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau via Census Reporter
- Furnace Flues Require Special Sealing Techniques, ENERGY STAR do-it-yourself guide
- NC Listings in the National Register of Historic Places, NC State Historic Preservation Office
- N.C. Gen. Stat. 143-139.2, Enforcement of insulation requirements; certificate for occupancy
- Attic Insulation Project, ENERGY STAR
Morrisville, NC
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Insulation Pros is an insulation contractor serving North Carolina, Morrisville and the rest of Wake County included.
Reach us
Send the square footage of your Morrisville attic, or call (336) 870-3893.