St. Louis sits at a meteorological crossroads — spring hail from southern plains supercells, severe ice storms in winter, 100°F humid summers, and the New Madrid Seismic Zone beneath it all. Every season brings a different roofing threat. We are the Gateway City’s dedicated roof repair specialists serving all of Greater St. Louis on both sides of the river.
Free Roof Inspection & Estimate — St. Louis MO
Hail & ice docs · Same-day response · MO + IL side coverage
St. Louis has the misfortune of sitting exactly where several destructive weather patterns converge. It’s far enough south to receive Gulf moisture-fed hailstorms, far enough north to get severe ice storms, and humid enough that summer heat degrades roofing materials faster than in drier cities. No season is a break for St. Louis roofs.
St. Louis sits in the transitional zone between the southern plains hail corridor and the Ohio Valley storm track. Spring supercells from the southwest routinely produce 1–2 inch hail across the metro. The city receives hail from both Gulf-moisture-fed storms tracking northeast and cold-front-driven systems tracking southeast — two distinct storm patterns, double the exposure.
St. Louis sits in the transition zone where warm Gulf moisture meets Arctic air — the exact conditions for freezing rain. Ice storms deposit half an inch to an inch of glaze ice on every surface, adding enormous weight to structures. Ice works under shingles at the eaves, exploits every existing crack, and forces open any marginally sealed flashing. The 2006 ice storm left 500,000 STL homes without power and caused widespread roof damage.
St. Louis summers are brutally hot and humid — regularly above 95°F with heat index values exceeding 105°F. The combination of high humidity and heat accelerates algae growth (the dark streaks visible on many STL roofs), degrades pipe boot rubber, and breaks down sealant at penetrations faster than in drier cities. Algae-resistant shingles are recommended on every St. Louis replacement.
St. Louis temperatures range from −5°F in hard winters to 105°F in August — a 110°F annual swing. Every flashing seal, pipe boot, and caulk joint cycles through this range repeatedly each year. Penetration seals that might last 15 years in a stable climate fail in 8–10 years in St. Louis from the repeated expansion and contraction stress.
St. Louis sits directly above the New Madrid Seismic Zone — the most seismically active fault system east of the Rockies. Moderate earthquakes loosen chimney mortar, crack brick masonry, shift chimneys enough to separate counter-flashing, and open gaps at masonry-to-roof junctions. After any felt seismic event, chimney and flashing inspections are advisable, particularly on older brick homes. We note chimney and masonry conditions on every St. Louis inspection.
St. Louis averages 40 inches of rain per year, much of it arriving as intense downpours from severe thunderstorms. The city sits at the confluence of the Missouri and Mississippi rivers — drainage is a constant issue. Roofs with any flashing failure, degraded pipe boots, or improperly installed valley metal can experience significant interior water damage in a single 3-inch-per-hour rainfall event.
From spring hail response to winter ice storm repair — year-round coverage across Greater St. Louis on both sides of the river.
St. Louis’s most frequent repair need. We document all hail and wind damage with insurer-ready photo reports for State Farm, Farmers, Shelter Insurance, and all Missouri and Illinois homeowners policies.
Free inspection · Full insurance assistance
Same-day response for active leaks, storm damage, and ice storm emergencies across Greater St. Louis. Serving the Missouri side and Illinois side equally — one call covers both.
Same-day response · MO & IL coverage
St. Louis’s 40 inches of annual rainfall and intense storm downpours find every weak point. We locate and fix leaks at pipe boots, flashings, chimneys, and valleys — with a chimney assessment on every inspection.
From $325 · Written estimate
Hail-damaged, ice-lifted, and humidity-aged shingles. We carry algae-resistant shingles — essential for St. Louis’s humidity — and always install ice-and-water shield at the eaves on every St. Louis job.
From $325 · Algae-resistant available
Insurance-approved full replacements are common after major hail and ice storm events. Most St. Louis homes completed in one day. We recommend algae-resistant, impact-rated shingles for maximum St. Louis durability.
$7,500–$17,000 typical STL home
50-point inspection including chimney and masonry assessment. After any hail event or felt seismic activity, we document all damage with timestamped photos in insurer-ready format, same visit.
Always free · Chimney check included
We cover all of St. Louis city and county and every major suburb on both the Missouri and Illinois sides of the river.
Local pricing for Greater St. Louis. Reflects Missouri and Illinois labour rates, seasonal demand patterns, and typical project scope.
| Service | St. Louis Price Range |
|---|---|
| Free inspection (hail + ice + condition) | Free |
| Minor shingle repair (1–10 shingles) | $325 – $900 |
| Pipe boot replacement | $165 – $350 |
| Chimney flashing repair / re-seal | $350 – $1,100 |
| Ice storm eave damage repair | $500 – $2,500 |
| Partial slope repair | $750 – $3,500 |
| Full replacement (1,500 sq ft) | $6,500 – $11,500 |
| Full replacement (2,500 sq ft) | $9,500 – $17,000 |
| Algae-resistant shingle upgrade | +$300 – $900 |
| Impact-resistant (Class 4) upgrade | +$500 – $1,600 |
| Annual maintenance plan | $299 – $449 / yr |
★ St. Louis Homeowner Tip
Algae-Resistant Shingles:
A St. Louis Priority
St. Louis’s combination of summer heat, 75% humidity, and abundant shade trees creates near-perfect conditions for Gloeocapsa magma algae — the organism behind the dark streaks on so many St. Louis roofs. Algae traps moisture against shingles and accelerates granule loss, reducing shingle lifespan by 3–5 years. Here’s what to specify on any St. Louis replacement.
A sample of recently completed work across Greater St. Louis. Details anonymised for homeowner privacy.
"After the May hailstorm I had three roofers at my door within two days. Two of them couldn’t tell me what grade of shingles they were proposing to install. RoofRepair.co came out, documented everything properly, explained why algae-resistant shingles matter in our area specifically (we have a lot of tree cover), filed the claim with complete documentation, and had my approval in less than a week. The crew was done before noon the next day. Highly competent from start to finish."
"February ice storm, first ceiling stain I’d seen in 14 years in this house. RoofRepair.co repaired the eave damage, but more importantly they found the chimney counter-flashing had separated — something they said was probably a combination of thermal movement and recent mild seismic activity. I had no idea St. Louis had that kind of earthquake risk. They rebuilt the entire flashing assembly. Two winters later, completely dry. The chimney assessment on every inspection is exactly the kind of thoroughness I was looking for."
"We manage commercial properties on both the Missouri and Illinois sides of the river. It’s genuinely difficult to find one roofing company that’s properly licensed and insured for both states and understands the different building code requirements. RoofRepair.co handles our entire St. Louis metro portfolio — Missouri side and Illinois side — with commercial invoicing, COI on file, and one account manager. This is rare and genuinely valuable."
Same-day response · MO & IL licensed · Free inspection · All Greater St. Louis