Decatur, IL · Flat Roof

Flat Roof Contractors in Decatur, Illinois

Commercial or residential flat roof — compare local roofing companies. 18 local roofers listed, 11 verified.

Short answer: Flat and low-slope roofs in Decatur are usually TPO ($5.50–$9 a sq ft installed), EPDM ($4.50–$8) or modified bitumen ($3–$7); the membrane lasts 15–25 years, mostly decided by how well the drains are kept clear. In Decatur: 5.9 heavy-rain days a year (1 inch+). 11 of the roofers below have a license we checked; for any other, ask for a license number and a certificate of insurance.

Get a free quote See Decatur in numbers
  • 5.9heavy-rain days a year (1 inch+)
  • 39.8 inrain a year
  • 8days a year at 90°F or hotter
  • 25%of homes are not single-family houses

How much life is left in my Decatur roof?

Typical lifespans are published ranges for each material; for a Decatur house, real life also depends on installation, attic ventilation and the weather Decatur gets.

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Under Decatur's summer heat, a flat roof's membrane choice drives lifespan more than almost anything else: white TPO or a reflective coating keeps surface temperatures 40 to 60 degrees lower than dark EPDM and extends service life significantly. Common flat roof systems in Decatur include TPO (heat-welded, energy-efficient), EPDM (durable rubber membrane), and modified bitumen — each with different cost, longevity, and maintenance profiles worth discussing with a local contractor.

Decatur in numbers

Public records for Decatur and its county, not estimates. Each figure shows its source.

  • #203of 209Decatur ranks #203 of the 209 cities we cover for median home value (low end).
  • #13of 209Decatur ranks #13 of the 209 cities we cover for share of homes built before 1980.

Hail reports per year in the county

Hail events per year in the county, 2017 to 2026* 5 2017 1 2018 1 2019 4 2020 2 2021 2 2022 4 2023 25 2024 5 2025 10 2026*
Hail events per year in the county, 2017 to 2026*
20175
20181
20191
20204
20212
20222
20234
202425
20255
2026*10

59 recorded events across 9 full years plus 2026 to June represented in the data, about 5.4 per represented full year. 2024 had the most events among represented full years: 25.

2026 covers only January to June: NOAA's file ends there, so it is not counted as the worst year or in the yearly average.

Source: NOAA hail events, county level · data as of 2017–2026*

Costliest storm day on record

Aug 19, 2025

6 reports that day (6 wind); reported property damage $1,000,000; county FIPS 17115, 2014–June 2026

Source: NOAA Storm Events · data as of 2014–June 2026

When storms hit Decatur

Hail reports by month in the county, all years combined 0 Jan 0 Feb 30 Mar 6 Apr 10 May 10 Jun 2 Jul 1 Aug 3 Sep 0 Oct 1 Nov 1 Dec
Hail reports by month in the county, all years combined
Jan0
Feb0
Mar30
Apr6
May10
Jun10
Jul2
Aug1
Sep3
Oct0
Nov1
Dec1

Most hail reports come in March; the season runs March to September. Book inspections and repairs before that window, not after.

Source: NOAA Storm Events · data as of 2014–June 2026

Roofing trade around Decatur

  • 7 roofing companies with payroll in the county, employing about 50 people; 71% have fewer than 5 employees.
  • A roofer's median pay here is $74,640 a year (Decatur, IL Metro Area).
Source: Census CBP · data as of 2023 Source: BLS OEWS, roofers · data as of May 2025

Decatur storm record: Macon County

What the National Weather Service logged in Macon County in 2014–2026. County level, because storm reports are filed by county, not by city limits.

  • 1823Founded
  • 676 ft (206 m)Elevation

Where hail of 1 inch or more was reported in Macon County

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  • 381 to 1.74 in
  • 121.75 to 2.74 in, golf ball to tennis ball
  • 02.75 in and up, baseball

Largest plotted stone: 2.5 in. Bigger dots are bigger stones.

50 reports of 1 inch or larger have coordinates. Each dot is a reported location, not a storm path.

Sources: NOAA, Census county outline

Biggest hail days

DateLargest hailReports that dayWhere it was reported
March 31, 2024 2.5 in, about the size of a tennis ball 20 Decatur
December 1, 2018 1.75 in, about the size of a golf ball 1 Niantic
March 28, 2020 1.75 in, about the size of a golf ball 1 Blue Mound
“The storm tracked southeastward, continuously dropping 1 to 2-inch diameter hail from southern Fulton County to western Douglas County before gradually weakening well after dark. The largest hail stones measuring 2.5 inches in diameter fell on the northeast side of Decatur in Macon County.”
National Weather Service report, March 31, 2024
Source: NOAA Storm Events Database · data as of 2014–2026

Last big hail on record

March 31, 2024

Hail of 1.75 inches (golf ball) or larger fell on 3 days in 2014–2026. Our records end where NOAA's do, so a newer storm may not be listed yet.

Strongest tornado

EF2 · December 28, 2025

It stayed on the ground for 22.21 miles and was up to 250 yards wide. This tornado crossed into far western Macon County from Christian County about 1 mile west-northwest of Blue Mound at 3:00 PM CST. Between Elwin and Turpin, several homes sustained roof damage and numerous large trees were snapped.

Strongest thunderstorm gust

100 mph · August 19, 2025

Extensive wind damage occurred across Maroa. The roof of a township building on South Wood Street was blown off and approximately 100 trees were blown down across town.

What it means for flat roof

Flat and low-slope roofs hold hail on the surface instead of letting it bounce. With 2.5-inch hail on record in Macon County, ask what membrane and cover board the contractor specifies.

Storm data: NOAA Storm Events (public domain). City facts: Wikidata (CC0).

What it costs in Decatur

Asphalt-shingle re-roof, 2,000 sq ft home, adjusted for Decatur labor and material prices. Your quote depends on roof size, pitch and scope.

That typical price is about 11.2% of the median Decatur home value ($97,300).

Source: Census ACS (Decatur city) · data as of 2019–2023

Full Decatur cost guide by material →

What Decatur's climate means for flat roof

  • Reflective TPO or a white coating earns its premium in Decatur, where dark membranes absorb punishing heat and age years faster.
  • Decatur's freeze-thaw cycling works open membrane seams and flashing laps — heat-welded TPO seams outlast taped or adhered ones in this climate.

Roofers in Decatur, IL

18 listed. Roofers we verified against a public registry come first.

This list covers roofing companies generally. Confirm flat roof experience, materials, insurance and current availability with each company. A Verified badge refers to the registry check, not a confirmed specialty.

Flat Roof in Decatur: questions

How do I find a flat roof company in Decatur?
PickARoofer lists roofing companies serving Decatur, IL. This is a general roofing directory; confirm flat roof experience and availability with each company. A Verified badge describes a separate registry check, not a confirmed service specialty or insurance check. Confirm scope, insurance and availability directly. Requests go to one contractor at a time, with up to three attempts; a response or start date is not guaranteed. Free for homeowners.
Should I repair or fully re-roof in Decatur?
Ask a roofer to document the damage and compare a written repair scope with a replacement estimate. Roof condition, remaining life, materials and the extent of damage affect the decision. Confirm any inspection fee before booking.
When is hail season in Decatur?
March is the worst month: 47% of the 64 hail reports NOAA holds for the county came then. Reports run from March to September. Book the inspection before March, while crews still have open dates.
How big does hail get near Decatur?
The largest hail NOAA logged near Decatur measured 2.5 inches, about the size of a tennis ball. Hail of an inch or more fell on 19 days in the same record. The biggest day was March 31, 2024, with 20 reports. The National Weather Service calls hail of 1 inch or larger severe; the bigger the stone, the more likely it is to crack a shingle.
How old are the homes in Decatur, and does it matter for the roof?
The median home in Decatur was built in 1960, and 80.5% of homes date from before 1980 (Census ACS). A roof on a home that old has often been re-covered at least once, so ask the roofer whether there is a second layer underneath: it changes the tear-off cost. The area sees about 94 freeze-thaw days a year, which loosens flashing and sealant.
What does roofing cost in Decatur?
For an average 2,000 sq ft home we model asphalt-shingle re-roof at $6,790 to $15,035 in Decatur, around $10,900 in the middle. That is about 11.2% of the median home value of $97,300. Your quote moves with roof size, pitch and how many layers come off.
How many roofing companies work around Decatur?
The Census Bureau counts 7 roofing companies with payroll in Macon County, employing about 50 people. 71.4% of them have fewer than five employees, so most quotes come from owner-run crews. A roofer's median pay is $74,640 a year (BLS).
Which flat roof membrane holds up best under Decatur's summer heat?
White TPO (thermoplastic polyolefin) is the dominant choice for new flat roofs in hot climates like Decatur: its reflective surface keeps membrane temperature dramatically lower than dark EPDM, which absorbs heat and ages faster under intense sun. Modified bitumen with a granulated cap sheet is an older alternative that performs adequately but runs hotter. Whichever system you choose, plan for a reflective coating renewal on the manufacturer's recommended cycle — it extends membrane life and cuts cooling load in attic-adjacent spaces.
What is the difference between TPO, EPDM, and modified bitumen for Decatur properties?
TPO (thermoplastic polyolefin) uses heat-welded seams and a white reflective surface — the current industry standard for new commercial and residential flat roofs, best for energy efficiency. EPDM (ethylene propylene diene monomer) is a rubber membrane installed with taped or adhesive seams — very durable and forgiving, widely used on residential flat roofs for decades. Modified bitumen is a reinforced asphalt sheet applied by torch or cold adhesive — economical and familiar to many local Decatur contractors, though it runs warmer than TPO and may require more frequent coating. Cost, pitch, and building type typically dictate the right choice — a Decatur flat-roof specialist can walk you through the tradeoffs for your specific structure.
Do I need a permit for flat roof in Illinois?
Permit requirements depend on the property, scope of work and local jurisdiction. Check with the city or county building department and confirm who will obtain any required permit before work starts.

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Figures above: NOAA Storm Events Database (hail, wind, tornado; county of the city, 2014–2026), U.S. Census Bureau American Community Survey 5-year estimates (housing), NASA POWER (temperature and rain, 2014–2023). Prices: our published price method. How we collect data.