Longmont, CO · Flat Roof

Flat Roof Contractors in Longmont, Colorado

Commercial or residential flat roof — compare local roofing companies. 30 local roofers listed.

Short answer: Flat and low-slope roofs in Longmont 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 Longmont: 0.4 heavy-rain days a year (1 inch+). Ask any roofer for a license number and a certificate of insurance.

Get a free quote See Longmont in numbers
  • 0.4heavy-rain days a year (1 inch+)
  • 17.9 inrain a year
  • 42days a year at 90°F or hotter
  • 30%of homes are not single-family houses

How much life is left in my Longmont roof?

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

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Flat and low-slope roofs in Longmont 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 Longmont 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.

Longmont in numbers

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

  • #204of 209Longmont ranks #204 of the 209 cities we cover for damaging thunderstorm-wind days (low end).
  • #6of 209Longmont ranks #6 of the 209 cities we cover for median home value.
  • #6of 209Longmont ranks #6 of the 209 cities we cover for freeze-thaw days.
  • #196of 209Longmont ranks #196 of the 209 cities we cover for yearly rainfall (low end).

Hail reports per year in the county

Hail events per year in the county, 2017 to 2025 2 2017 45 2018 42 2019 2 2020 2 2021 5 2022 9 2023 7 2024 16 2025
Hail events per year in the county, 2017 to 2025
20172
201845
201942
20202
20212
20225
20239
20247
202516

130 recorded events across 9 years represented in the data, about 14.4 per represented full year. 2018 had the most events among represented full years: 45.

Source: NOAA hail events, county level · data as of 2017–2025

Costliest storm day on record

Jul 5, 2019

24 reports that day (24 hail); reported property damage $0; county FIPS 08013, 2014–June 2026

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

When storms hit Longmont

Hail reports by month in the county, all years combined 0 Jan 0 Feb 0 Mar 0 Apr 29 May 52 Jun 40 Jul 13 Aug 10 Sep 2 Oct 0 Nov 0 Dec
Hail reports by month in the county, all years combined
Jan0
Feb0
Mar0
Apr0
May29
Jun52
Jul40
Aug13
Sep10
Oct2
Nov0
Dec0

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

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

Roofing trade around Longmont

  • 20 roofing companies with payroll in the county, employing about 249 people; 55% have fewer than 5 employees.
  • A roofer's median pay here is $56,140 a year (Boulder, CO Metro Area).
Source: Census CBP · data as of 2023 Source: BLS OEWS, roofers · data as of May 2025

Longmont storm record: Boulder County

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

  • 1871Founded
  • 4,984 ft (1,519 m)Elevation

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

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  • 881 to 1.74 in
  • 211.75 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.

110 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 18, 2018 3 in, about the size of a teacup 23 Superior
July 5, 2019 2.5 in, about the size of a tennis ball 24 Louisville
June 4, 2015 2.5 in, about the size of a tennis ball 5 Lyons
“The storms that moved across northern Washington County caused severe agricultural damage. Wheat fields were significantly damaged and the young corn was stripped of all its leaves.”
National Weather Service report, June 18, 2018
Source: NOAA Storm Events Database · data as of 2014–2026

Last big hail on record

May 9, 2023

Hail of 1.75 inches (golf ball) or larger fell on 4 days in 2014–2026. Our records end where NOAA's do, so a newer storm may not be listed yet.

Strongest tornado

EF3 · June 4, 2015

It stayed on the ground for 5.84 miles and was up to 440 yards wide. The tornado first touched about 3 miles south of Berthoud, and then tracked to the west/northwest and lifted about 6 miles southwest of Berthoud. The majority of the damage was EF1, with some areas of EF2, and a few small areas of EF3.

Strongest thunderstorm gust

72 mph · March 30, 2014

On the evening of the 30th, high based showers and thunderstorms produced microburst winds over portions of northern Jefferson, eastern Boulder and southwest Weld Counties.

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 Boulder 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 Longmont

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

That typical price is about 2.2% of the median Longmont home value ($541,400).

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

Full Longmont cost guide by material →

What Longmont's climate means for flat roof

  • Flat and low-slope roofs in Longmont 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 Longmont, where dark membranes absorb punishing heat and age years faster.
  • Longmont'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 Longmont, CO

30 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 Longmont: questions

How do I find a flat roof company in Longmont?
PickARoofer lists roofing companies serving Longmont, CO. 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.
Will insurance pay for storm-related flat roof in Longmont?
Coverage, deductibles and reporting deadlines depend on your policy and circumstances. Document damage safely, contact your insurer promptly and ask for a written repair scope. This directory cannot determine coverage.
When is hail season in Longmont?
June is the worst month: 36% of the 146 hail reports NOAA holds for the county came then. Reports run from May to September. Book the inspection before May, while crews still have open dates.
How big does hail get near Longmont?
The largest hail NOAA logged near Longmont measured 3 inches, about the size of a teacup. Hail of an inch or more fell on 30 days in the same record. The biggest day was June 18, 2018, with 23 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 Longmont, and does it matter for the roof?
The median home in Longmont was built in 1990, and 37.6% 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 130 freeze-thaw days a year, which loosens flashing and sealant.
What does roofing cost in Longmont?
For an average 2,000 sq ft home we model asphalt-shingle re-roof at $7,560 to $16,740 in Longmont, around $12,150 in the middle. That is about 2.2% of the median home value of $541,400. Your quote moves with roof size, pitch and how many layers come off.
How many roofing companies work around Longmont?
The Census Bureau counts 20 roofing companies with payroll in Boulder County, employing about 249 people. 55% of them have fewer than five employees, so most quotes come from owner-run crews. A roofer's median pay is $56,140 a year (BLS).
How do I maintain a flat roof through Longmont's winters?
Flat roof maintenance in Longmont 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 Longmont 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 Longmont contractors, though it runs warmer than TPO and may require more frequent coating. Cost, pitch, and building type typically dictate the right choice — a Longmont flat-roof specialist can walk you through the tradeoffs for your specific structure.
Do I need a permit for flat roof in Colorado?
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.