Joliet, IL · Flat Roof

Flat Roof Contractors in Joliet, Illinois

Commercial or residential flat roof — compare local roofing companies. 27 local roofers listed, 12 verified.

Short answer: Flat and low-slope roofs in Joliet 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 Joliet: 4.6 heavy-rain days a year (1 inch+). 12 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 Joliet in numbers
  • 4.6heavy-rain days a year (1 inch+)
  • 39.4 inrain a year
  • 7days a year at 90°F or hotter
  • 21%of homes are not single-family houses

How much life is left in my Joliet roof?

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

Free flat roof quote

Your request goes to one roofer, not five competitors.

Free for homeowners · No spam · One contractor at a time

Request sent

Your request has been received. A roofing contractor who accepts it can contact you to confirm the work and availability.

Under Joliet'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 Joliet 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.

Joliet in numbers

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

  • #24of 209Joliet ranks #24 of the 209 cities we cover for damaging thunderstorm-wind days.
  • #30of 209Joliet ranks #30 of the 209 cities we cover for freeze-thaw days.
  • #42of 209Joliet ranks #42 of the 209 cities we cover for hail days of 1 inch or more.
  • #45of 209Joliet ranks #45 of the 209 cities we cover for largest hailstone on record.

Hail reports per year in the county

Hail events per year in the county, 2017 to 2026* 21 2017 19 2019 5 2020 2 2022 12 2023 15 2024 2 2025 17 2026*
Hail events per year in the county, 2017 to 2026*
201721
201919
20205
20222
202312
202415
20252
2026*17

93 recorded events across 7 full years plus 2026 to June represented in the data. 2017 had the most events among represented full years: 21.

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. Years without a data row: 2018, 2021. Missing rows are not treated as zero; no annual average is shown.

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

Costliest storm day on record

Jun 30, 2014

11 reports that day (10 wind, 1 tornado); reported property damage $755,000; county FIPS 17197, 2014–June 2026

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

When storms hit Joliet

Hail reports by month in the county, all years combined 0 Jan 17 Feb 28 Mar 14 Apr 15 May 25 Jun 4 Jul 4 Aug 4 Sep 0 Oct 0 Nov 0 Dec
Hail reports by month in the county, all years combined
Jan0
Feb17
Mar28
Apr14
May15
Jun25
Jul4
Aug4
Sep4
Oct0
Nov0
Dec0

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

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

Roofing trade around Joliet

  • 66 roofing companies with payroll in the county, employing about 588 people; 62% have fewer than 5 employees.
  • A roofer's median pay here is $82,090 a year (Chicago-Naperville-Elgin, IL-IN Metro Area).
Source: Census CBP · data as of 2023 Source: BLS OEWS, roofers · data as of May 2025

Joliet storm record: Will County

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

  • 1833Founded
  • 541 ft (165 m)Elevation
  • Louis JollietNamed after

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

1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.25 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.5 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail1.75 in hail2 in hail2.5 in hail3 in hail Joliet
  • 761 to 1.74 in
  • 101.75 to 2.74 in, golf ball to tennis ball
  • 12.75 in and up, baseball

Largest plotted stone: 3 in. Bigger dots are bigger stones.

87 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 10, 2026 3 in, about the size of a teacup 3 Bolingbrook
June 10, 2015 2 in, about the size of a hen egg 8 Lockport
February 28, 2017 1.75 in, about the size of a golf ball 9 Frankfort
“A handful of hail reports from along IL-53 in Bolingbrook ranged in size from 1 to 3 inches.”
National Weather Service report, March 10, 2026
Source: NOAA Storm Events Database · data as of 2014–2026

Last big hail on record

March 31, 2026

Hail of 1.75 inches (golf ball) or larger fell on 7 days in 2014–2026. Our records end where NOAA's do, so a newer storm may not be listed yet.

Strongest tornado

EF2 · July 15, 2024

It stayed on the ground for 24.9 miles and was up to 325 yards wide. A tornado with estimated peak winds of 130 mph which touched down in Grundy County and crossed into Will County between Lauren Drive and Old Kerry Grove Road. The tornado was likely at its maximum path width of 325 yards as it was crossing into Will County.

Strongest thunderstorm gust

96 mph · May 23, 2020

There was wind damage to multiple roofs, including much of a roof lifted and thrown from a downtown building. Near Larkin Avenue and Jefferson Street, widespread tree damage was reported including trees two feet in diameter, blocking multiple streets.

What it means for flat roof

Flat and low-slope roofs hold hail on the surface instead of letting it bounce. With 3-inch hail on record in Will 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 Joliet

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

That typical price is about 4.4% of the median Joliet home value ($248,600).

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

Full Joliet cost guide by material →

What Joliet's climate means for flat roof

  • Reflective TPO or a white coating earns its premium in Joliet, where dark membranes absorb punishing heat and age years faster.
  • Joliet'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 Joliet, IL

27 listed, first 20 shown. 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 Joliet: questions

How do I find a flat roof company in Joliet?
PickARoofer lists roofing companies serving Joliet, 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 Joliet?
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 Joliet?
March is the worst month: 25% of the 111 hail reports NOAA holds for the county came then. Reports run from February to September. Book the inspection before February, while crews still have open dates.
How big does hail get near Joliet?
The largest hail NOAA logged near Joliet measured 3 inches, about the size of a teacup. Hail of an inch or more fell on 36 days in the same record. The biggest day was March 10, 2026, with 3 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 Joliet, and does it matter for the roof?
The median home in Joliet was built in 1986, and 46.8% 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 98 freeze-thaw days a year, which loosens flashing and sealant.
What does roofing cost in Joliet?
For an average 2,000 sq ft home we model asphalt-shingle re-roof at $6,790 to $15,035 in Joliet, around $10,900 in the middle. That is about 4.4% of the median home value of $248,600. Your quote moves with roof size, pitch and how many layers come off.
How many roofing companies work around Joliet?
The Census Bureau counts 66 roofing companies with payroll in Will County, employing about 588 people. 62.1% of them have fewer than five employees, so most quotes come from owner-run crews. A roofer's median pay is $82,090 a year (BLS).
Which flat roof membrane holds up best under Joliet's summer heat?
White TPO (thermoplastic polyolefin) is the dominant choice for new flat roofs in hot climates like Joliet: 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 Joliet 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 Joliet contractors, though it runs warmer than TPO and may require more frequent coating. Cost, pitch, and building type typically dictate the right choice — a Joliet 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.

More in Joliet

Flat Roof in nearby Illinois cities

All roofers nearby

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.