The City of St. Louis is an independent city. It is not in any county. St. Louis City and St. Louis County are two separate governments with separate building codes, separate permit offices and separate licensing — and most County addresses sit inside an incorporated municipality with a third set of rules on top. Anyone who gives you one confident answer for 'St. Louis' has not checked which St. Louis your building is in. We check the address before we quote the job.
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St. Louis is a city of parapeted flat roofs, and its code says exactly what to do about them. Where roof drains are required and the perimeter construction extends above the roof such that water will be entrapped, the City requires either overflow drains the same size as the roof drains with the inlet flow line two inches above the roof's low point, or overflow scuppers three times the size of the roof drains with a minimum opening height of four inches, set in the adjacent parapet walls at the same two-inch inlet height. Overflow drains must discharge to an approved location and may not be connected to roof drain lines. These are checkable numbers, and we design to them.
The Cultural Resources Office states that in a City Historic District a permit is required for all exterior work except painting wood trim, and that work not requiring a building permit is regulated by the Historic District Standards instead. Each district's standards are adopted by their own ordinance, so there is no single citywide roof rule. One recurring provision matters on commercial and mixed-use buildings: vents, piping, skylights, rooftop air conditioning units and communication devices must be installed on non-visible portions of the roof. That constrains RTU placement before it constrains the membrane.
District standards treat a flat-roof replacement relatively leniently — the Skinker-DeBaliviere standards call it general maintenance — but state that any repair or reconstruction of parapets requires a permit. On St. Louis's masonry stock, roof work and parapet work travel together. Timing matters: the CRO says most permits are approved within five working days, but anything escalated to the Preservation Board goes onto a monthly cycle, and the Board meets the fourth Monday of each month. On an insurance deadline, that application goes in early.
The City's own guidance is unambiguous: refuse from any business will not be accepted at City facilities, any load that appears to be commercial waste will be rejected, and anyone suspected of hauling for hire will be rejected. Transfer-station eligibility is limited to City residents, and commercial trucks are not allowed. That means tear-off from your building goes to commercial disposal, and it has to be in the number. A contractor who is vague about where the debris goes has either not priced it or is planning to find out later.
Missouri has no state roofing contractor license — licensing is municipal, and the City of St. Louis licenses contractors through a Construction Industry Contractor Graduated Business License. It is a business license rather than a trade-competency license: the requirements include proof of workers' compensation coverage or a signed exemption affidavit, clearance from the Collector of Revenue, an occupancy permit from the Building Division, a state driver's license copy, a sales tax number where applicable, and a subcontractor list for general contractors. We hold what the City requires and we tell owners plainly that a business license is not a competency credential — ask about the work instead.
The City of St. Louis adopted the 2018 I-codes effective 1 August 2018 — Ordinance 70794 for the building code, 70795 for the residential code, 70797 for existing buildings, 70800 mechanical and 70798 property maintenance. Its amended Table R301.2(1) gives 20 psf ground snow, a 115 mph wind speed, Seismic Design Category C, severe weathering, a 30-inch frost line, a 5°F winter design temperature, an air freezing index of 963 and no ice shield underlayment requirement. We do not publish County figures, because the County's adopted edition and criteria are not something we could verify.
First question on every St. Louis commercial job: City, County, or a municipality inside the County. The answer changes the code, the permit office and the licensing. Then we walk the field, cut cores, map wet insulation, and look hard at the parapets and the secondary drainage, because on this building stock those are where the money and the risk live.
If the building sits in one of the City's historic districts, the Cultural Resources Office application goes in early — staff approval typically runs about five working days, but a Preservation Board referral lands on a monthly cycle. We also confirm at that stage whether any rooftop unit or vent relocation is constrained by the district's visibility rules, before equipment is ordered.
Nothing opens that cannot be closed the same day. Where the secondary drainage does not meet the amended R903.4.1 requirements, this is the moment it gets corrected — overflow sized and set to the two-inch inlet height, discharging to an approved location, not tied into the roof drain lines. Perimeter and corner attachment engineered rather than assumed.
Inspections called, a walk with your facilities lead, and a documentation package: permit record, CRO approval where one applied, drainage detail documentation, material records, manufacturer warranty registration and photographs of everything now buried under membrane.
Heat-welded seams with no exposed fasteners is the right default on a parapeted flat roof, and the reflective surface earns its keep through a Missouri summer. The specification questions here are less about the membrane than about what surrounds it: parapet base flashing height, scupper and overflow detailing, and termination into old masonry that may need repointing at the same time. PVC earns its premium where restaurant exhaust is in play, which in this city is often.
On an older masonry building with a complicated parapet perimeter, two-ply redundancy is a legitimate risk decision rather than an upsell. The granulated cap handles service traffic, repairs integrate permanently rather than patching a seam, and the assembly is forgiving of the slightly irregular substrates that century-old St. Louis buildings reliably provide.
District standards commonly require that where historic roof material exists on a sloped roof, that material or an approved replica be used to replace it. You cannot quietly convert a visible slate roof to asphalt in a City Historic District. That is a real constraint and a real cost, and it is far better discovered at the estimate than at the stop-work order. We read the specific district's standards document before we write the scope.
Available on qualifying single-ply and modified bitumen assemblies from one manufacturer installed by a certified contractor, with no dollar limit on covered repair. On a building with complex parapet and drainage conditions, the details that decide whether this warranty holds are the ones we design first.
The baseline with most commercial membranes: defects in the membrane and nothing else. Not labor, not flashings, not the edge, not the parapet base. Worth having, and we will not let a proposal present it as system coverage.
Our own coverage on the installation, sitting under whatever the manufacturer provides. Seams, flashings, terminations, drainage detailing. Behind it sits Missouri's merchandising practices act, under which a violation of the state's roofing conduct statute is an unfair practice.
Don't see your question? Call us at (573) 370-7663 — we're happy to talk it through.
Because they are different governments. The City of St. Louis is an independent city and is not part of any county. The City and the County have separate building codes, separate permit offices, separate contractor licensing and separate historic-preservation regimes — and most County addresses are also inside an incorporated municipality with its own rules, which makes a third layer. Clayton, Kirkwood, Chesterfield, University City and Florissant are County municipalities, not City neighborhoods. Getting this wrong is the most common error we see on competitor estimates here.
Its amendment to R903.4.1 is specific. Where roof drains are required and the perimeter construction extends above the roof so that water will be entrapped if the primary drains back up, you need either overflow drains the same size as the roof drains, with the inlet flow line two inches above the roof's low point, or overflow scuppers three times the size of the roof drains with a minimum opening height of four inches, installed in the adjacent parapet walls at that same two-inch inlet height. Overflow drains must discharge to an approved location and must not be connected to roof drain lines.
A great deal. The Cultural Resources Office states that in a City Historic District a permit is required for all exterior work except painting wood trim, and that work which does not require a building permit is instead regulated by the Historic District Standards. There are eighteen districts on the City's current list — ten Local Historic Districts and eight Certified Local Historic Districts — and each has its own ordinance-adopted standards, so there is no single citywide roof rule. Parapet repair or reconstruction specifically requires a permit under the district standards we have read.
Check the district standards first. The standards we have read require that vents, piping, skylights, rooftop air conditioning units and communication devices be installed on non-visible portions of the roof or at not-visible portions of the property. That is a placement constraint on mechanical equipment, and it is much cheaper to design around before units are ordered than to discover at review. Outside a district this is a normal permitting question; inside one it is a design question.
The Cultural Resources Office says most permits are approved within five working days, and some routine items may be handled at its counter. Larger projects go to the Preservation Board, which meets the fourth Monday of each month — a monthly cycle rather than a rolling one. On an insurance claim with a deadline, that distinction is the whole schedule, and it is why we file district applications early rather than treating them as a formality at the end.
To commercial disposal, and it is in our number. The City's own guidance states that refuse from any business will not be accepted, that any load appearing to be commercial waste will be rejected, that anyone suspected of hauling for hire will be rejected, and that commercial trucks are not allowed. Transfer stations serve City residents only. So there is no route by which a contractor — or a homeowner acting for a contractor — disposes of tear-off through City facilities. Any bid that is vague about this has a gap in it.
A Construction Industry Contractor Graduated Business License. Missouri has no state roofing license, and the City's license is a business license rather than a competency exam: it requires proof of workers' compensation coverage or a signed exemption affidavit, clearance from the Collector of Revenue, an occupancy permit from the Building Division, and supporting documentation including a subcontractor list for general contractors. We say plainly that this license proves a company is registered and insured — not that it can roof. Ask about the work and the references separately.
In the City of St. Louis, the 2018 I-codes, effective 1 August 2018: Ordinance 70794 building, 70795 residential, 70797 existing building, 70800 mechanical, 70798 property maintenance. The amended Table R301.2(1) gives 20 psf ground snow, 115 mph wind, Seismic Category C, severe weathering, a 30-inch frost line, a 5°F winter design temperature, an air freezing index of 963, and ice shield underlayment listed as not required. For a County address we do not publish an edition or criteria, because the County's figures were not something we could verify — we obtain them from County Public Works for the specific job.
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