# Flat Roof Membrane Systems

> Flat and low-slope commercial roofing in greater St. Louis: BUR, modified bitumen, EPDM, SPF, PVC, and TPO. We match the membrane to the building.

Canonical: https://donovanrc.com/commercial/flat-roof/

![Aerial of a white single-ply membrane roof on a low-slope building](/wp-content/uploads/donovan/photos/commercial-projects/apartment-white-membrane-aerial.webp)

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Commercial · Flat Roof

# The full
membrane menu.

BUR, modified bitumen, EPDM, spray polyurethane foam, and thermoplastic PVC or TPO. We match the membrane to the building, not the building to whichever membrane we feel like installing that week.

What it is

## Flat roofing is its own discipline.

Flat and low-slope roofing behaves nothing like a shingle roof. There is no slope doing the work for you, so the membrane, the drainage, and the detailing have to be right or water sits and finds a way in. The correct system depends on the slope, the drainage, the rooftop equipment, and the chemicals the roof is exposed to. We carry the full menu so we can spec the building honestly instead of selling the one product we stock. We handle flat roof repair in St. Louis and the surrounding metro too: ponding, failed seams, punctures, and flashing that has let go.

SystemsBUR, mod-bit, EPDM, SPF, PVC, TPO

SlopeFlat and low-slope

SelectionMatched to the building

DrainageAssessed before spec

Offer$100 off a flat-roof job

InspectionFree, with roof report

![EPDM membrane with pipe boots](/wp-content/uploads/donovan/photos/commercial/boots-epdm.webp)

![Single-ply membrane roof in progress](/wp-content/uploads/donovan/photos/commercial/tpo-scene.webp)

![Roller finishing a membrane seam](/wp-content/uploads/donovan/photos/commercial/welder-red-roller.webp)

BUR and Modified Bitumen

### The proven multi-ply approach.

Built-up roofing and modified bitumen layer the roof for redundancy. Time-tested, tough underfoot, and a strong choice on roofs that see foot traffic or heavy rooftop equipment.

EPDM and SPF

### Rubber membrane or seamless foam.

EPDM is a durable rubber single-ply that handles temperature swings well. Spray polyurethane foam goes down seamless and adds insulation in the same pass, which is useful when the building is fighting energy cost or ponding.

PVC and TPO

### Thermoplastic, heat-welded.

PVC and TPO are reflective thermoplastics with heat-welded seams. PVC adds real chemical resistance for restaurant and industrial exhaust; TPO is the cost-effective reflective workhorse. We weld every seam either way.

### Flat roof leaking, ponding, or just due?

We inspect the roof for free and come back with a report on which membrane the building actually needs. Move forward with us and take $100 off the flat-roof job.

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What homeowners are saying

- > “Justin did a great job of communicating and was on the job site a lot.”

Gerald K. · Google
- > “Nick Mirth did an excellent job throughout the process our insurance claim!”

Tim C. · Google
- > “Great experience, very knowledgeable and customer friendly. I would highly Recommend.”

Kathy O. · Google

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