Flat roofs,
flawless.
Commercial and residential flat roof experts serving the entire St. Louis metro. One call. Done right. Guaranteed.
Every flat roof problem has a permanent solution.
Commercial Flat Roofing
EPDM, TPO, and modified bitumen systems for warehouses, retail, offices, and multi-family. Built to protect your investment for decades.
Residential Flat Roofing
Modern homes, mid-century designs, and additions with flat or low-slope roofs. We match your aesthetic while ensuring zero leaks.
Repair & Emergency
Ponding water, membrane tears, flashing failures. We diagnose fast and fix permanently — not with band-aids.
Coatings & Restoration
Extend your roof’s life by 15+ years with elastomeric and silicone coatings. A fraction of the cost of full replacement.
General roofers guess.
We know.
“Patched 3 times, still leaks”
Diagnosed root cause on first visit, permanent fix
“Generic crew, no flat roof training”
Certified flat roof specialists since 2008
“Looks fine from down here”
Full membrane inspection with photo report
“No follow-up, no warranty”
5-year workmanship warranty + annual checkup
Four steps to a
roof that lasts.
You call or submit a request
Tell us about your roof — type of building, what’s happening, what concerns you. Takes 2 minutes.
Don't take our word for it.
“Our two-family flat had been leaking for years. Other roofers kept patching it, but the leaks always came back. These guys actually diagnosed the real problem — bad drainage — and fixed it right. Two years later, bone dry. Should have called them first.”
“We manage several commercial properties in Clayton with flat roofs. St. Louis Flat Roofing handles all of them. Their maintenance program has saved us thousands in emergency repairs. Professional, responsive, and fair.”
“Had a leak over our addition that two other companies could not find. These folks found it on the first visit with their moisture testing equipment. Repair was done same week and they stood behind their warranty. Highly recommend.”
“They replaced the flat roof on our home and it looks great. The crew was clean, professional, and finished in two days. Price was very fair and they explained everything clearly. No surprises.”
“Our warehouse roof was deteriorating but did not need full replacement. They applied a silicone coating system that sealed everything up and gave us another 15 years of life. Saved us about 60% versus replacement. Smart recommendation.”
“Emergency leak during a storm — they were out the next morning and had it sealed by afternoon. Follow-up permanent repair was done the following week. These are the kind of people you want on speed dial.”
Wherever you are in
St. Louis, we're close.
Plus the entire St. Louis metro, St. Louis County, St. Charles County, and Metro East
Straight answers.
A flat roof is a roofing system with a slope of less than 2:12 (less than about 10 degrees). Despite the name, flat roofs are not completely flat — they have a slight pitch (typically 1/4 inch per foot) to allow water drainage. Flat roofs are common on commercial buildings, industrial facilities, and many residential properties in cities like St. Louis. They are covered with waterproof membranes such as TPO, EPDM, PVC, modified bitumen, or built-up roofing (BUR) rather than the shingles used on steep-slope roofs.
A properly installed flat roof lasts 20-30 years depending on the material. TPO roofing lasts 25-30 years. PVC roofing lasts 25-30 years. EPDM (rubber) roofing lasts 20-25 years. Modified bitumen lasts 20-25 years. Built-up roofing (BUR) lasts 20-30 years. Roof coatings can extend an existing flat roof by 10-15 years. Regular maintenance — including semi-annual inspections, drain cleaning, and prompt repairs — can significantly extend these lifespans.
Yes, most flat roofs are designed to be walked on for maintenance purposes. However, you should always use caution: wear soft-soled shoes, avoid walking on wet surfaces, stay away from edges without fall protection, and be careful around roof penetrations. Some flat roof membranes (especially older ones) can be damaged by foot traffic. If your building requires regular roof access for HVAC maintenance or other purposes, consider installing walkway pads to protect the membrane.
Flat roof maintenance should include: semi-annual professional inspections (spring and fall), clearing debris from the roof surface, cleaning drains, gutters, and scuppers, checking and resealing flashings around penetrations, trimming overhanging tree branches, inspecting for ponding water after rain, and addressing any damage promptly. In St. Louis, post-storm inspections after severe weather are also recommended. A professional maintenance plan costs $199-$500 per year and can extend your flat roof life by 50% or more.
Yes, flat roof insulation is essential for energy efficiency, condensation prevention, and building code compliance. In St. Louis, building codes require minimum R-25 to R-30 roof insulation for commercial buildings and R-38 to R-49 for residential. Common flat roof insulation types include polyisocyanurate (polyiso) boards, expanded polystyrene (EPS), and extruded polystyrene (XPS). Proper insulation reduces heating and cooling costs by 20-40% and prevents condensation that can damage the roof structure.
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your roof?
Free inspection. Honest pricing. No obligation.
Let's talk about your flat roof.