Sioux City, IA · Flat Roof

Flat Roof Contractors in Sioux City, Iowa

Commercial or residential flat roof — compare local roofing companies. 25 local roofers listed.

Short answer: Flat and low-slope roofs in Sioux City 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 Sioux City: 4.3 heavy-rain days a year (1 inch+). Ask any roofer for a license number and a certificate of insurance.

Get a free quote See Sioux City in numbers
  • 4.3heavy-rain days a year (1 inch+)
  • 28.8 inrain a year
  • 28days a year at 90°F or hotter
  • 26%of homes are not single-family houses

How much life is left in my Sioux City roof?

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

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Flat and low-slope roofs in Sioux City must be engineered and maintained for snow load — pooling meltwater under a heavy snowpack is the leading cause of membrane failure here, and drain clearing each fall is not optional. Common flat roof systems in Sioux City 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.

Sioux City in numbers

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

  • #12of 209Sioux City ranks #12 of the 209 cities we cover for share of homes built before 1980.
  • #24of 209Sioux City ranks #24 of the 209 cities we cover for freeze-thaw days.
  • #178of 209Sioux City ranks #178 of the 209 cities we cover for yearly rainfall (low end).
  • #164of 209Sioux City ranks #164 of the 209 cities we cover for median home value (low end).

Hail reports per year in the county

Hail events per year in the county, 2017 to 2026* 6 2017 5 2018 3 2019 2 2020 1 2021 4 2022 6 2023 11 2024 3 2025 17 2026*
Hail events per year in the county, 2017 to 2026*
20176
20185
20193
20202
20211
20224
20236
202411
20253
2026*17

58 recorded events across 9 full years plus 2026 to June represented in the data, about 4.6 per represented full year. 2024 had the most events among represented full years: 11.

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

Dec 15, 2021

14 reports that day (10 wind, 4 tornado); reported property damage $1,155,000; county FIPS 19193, 2014–June 2026

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

When storms hit Sioux City

Hail reports by month in the county, all years combined 0 Jan 0 Feb 0 Mar 20 Apr 18 May 43 Jun 1 Jul 5 Aug 3 Sep 0 Oct 2 Nov 0 Dec
Hail reports by month in the county, all years combined
Jan0
Feb0
Mar0
Apr20
May18
Jun43
Jul1
Aug5
Sep3
Oct0
Nov2
Dec0

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

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

Roofing trade around Sioux City

  • 11 roofing companies with payroll in the county, employing about 45 people; 54% have fewer than 5 employees.
  • A roofer's median pay here is $47,050 a year (Sioux City, IA-NE-SD Metro Area).
Source: Census CBP · data as of 2023 Source: BLS OEWS, roofers · data as of May 2025

Sioux City storm record: Woodbury County

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

  • 1854Founded
  • 1,201 ft (366 m)Elevation

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

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  • 561 to 1.74 in
  • 101.75 to 2.74 in, golf ball to tennis ball
  • 02.75 in and up, baseball

Largest plotted stone: 2 in. Bigger dots are bigger stones.

66 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
June 12, 2024 2 in, about the size of a hen egg 7 Sloan
May 15, 2026 2 in, about the size of a hen egg 5 Anthon
April 24, 2016 1.75 in, about the size of a golf ball 7 Correctionville
“Significant damage to young crops and property resulted in a disaster declaration by the Governor of Iowa for Woodbury County.”
National Weather Service report, June 12, 2024
Source: NOAA Storm Events Database · data as of 2014–2026

Last big hail on record

May 18, 2026

Hail of 1.75 inches (golf ball) or larger fell on 9 days in 2014–2026. Our records end where NOAA's do, so a newer storm may not be listed yet.

Strongest tornado

EF2 · December 15, 2021

It stayed on the ground for 8.44 miles and was up to 100 yards wide. The tornado spun up two miles northeast of Bronson along 190th Street, around one mile west of the intersection with Emmett Ave, where it ripped a portion of the roof off a single family home and damaged an outbuilding, with debris sent 100 yards to the north into a field.

Strongest thunderstorm gust

96 mph · May 17, 2026

Thunderstorm winds destroyed an outbuilding and uprooted several pine trees across the street.

What it means for flat roof

Flat and low-slope roofs hold hail on the surface instead of letting it bounce. With 2-inch hail on record in Woodbury 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 Sioux City

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

That typical price is about 6.0% of the median Sioux City home value ($162,600).

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

Full Sioux City cost guide by material →

What Sioux City's climate means for flat roof

  • Flat and low-slope roofs in Sioux City must be engineered for snow load and kept drained — ponding under a melting snowpack is the top failure point here.
  • Reflective TPO or a white coating earns its premium in Sioux City, where dark membranes absorb punishing heat and age years faster.
  • Sioux City'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 Sioux City, IA

25 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 Sioux City: questions

How do I find a flat roof company in Sioux City?
PickARoofer lists roofing companies serving Sioux City, IA. 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 Sioux City?
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 Sioux City?
June is the worst month: 47% of the 92 hail reports NOAA holds for the county came then. Reports run from April to August. Book the inspection before April, while crews still have open dates.
How big does hail get near Sioux City?
The largest hail NOAA logged near Sioux City measured 2 inches, about the size of a hen egg. Hail of an inch or more fell on 26 days in the same record. The biggest day was June 12, 2024, with 7 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 Sioux City, and does it matter for the roof?
The median home in Sioux City was built in 1956, and 80.6% 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 99 freeze-thaw days a year, which loosens flashing and sealant.
What does roofing cost in Sioux City?
For an average 2,000 sq ft home we model asphalt-shingle re-roof at $6,090 to $13,485 in Sioux City, around $9,800 in the middle. That is about 6% of the median home value of $162,600. Your quote moves with roof size, pitch and how many layers come off.
How many roofing companies work around Sioux City?
The Census Bureau counts 11 roofing companies with payroll in Woodbury County, employing about 45 people. 54.5% of them have fewer than five employees, so most quotes come from owner-run crews. A roofer's median pay is $47,050 a year (BLS).
How do I maintain a flat roof through Sioux City's winters?
Flat roof maintenance in Sioux City centers on drainage: clear drains and scuppers each fall before the first snow. Ponding meltwater under a deep snowpack is the leading cause of membrane failure here — water weighs 5.2 pounds per square foot per inch of depth, and even a few inches of standing water adds significant unplanned load. After heavy snow events, a professional roof rake or heating cables at the drain area prevent the most dangerous pooling. Annual spring inspections after snowmelt catch seam and flashing damage before it compounds.
What is the difference between TPO, EPDM, and modified bitumen for Sioux City 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 Sioux City contractors, though it runs warmer than TPO and may require more frequent coating. Cost, pitch, and building type typically dictate the right choice — a Sioux City flat-roof specialist can walk you through the tradeoffs for your specific structure.
Do I need a permit for flat roof in Iowa?
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.