Commercial EPDM Flat Roof Restoration in South Kingstown

A South Kingstown commercial building needed its flat roof brought back to a watertight, long-service condition — the kind of methodical restoration a business roof demands so the operation underneath it stays dry and open. Pinnacle rebuilt it with a fully adhered EPDM rubber membrane system over new insulation. Pinnacle roofs go on fast — often as a one-day roof replacement — and flexible financing keeps a project like this within reach, with plans as low as 0% interest for 18 months.

The old, failing flat roof was stripped to a sound substrate and rebuilt with new polyiso insulation and a fully adhered EPDM membrane, detailed at every edge, curb, and rooftop unit. This project is in South Kingstown, Rhode Island, finished in EPDM Rubber Membrane.

Scope of Work

Flat commercial roofing is a different discipline from steep-slope residential work, and it starts with getting down to a stable base. We removed the failed upper membrane and any wet insulation beneath it — saturated board is the hidden damage that develops over years of slow leaking through seams that have lost adhesion — and cleaned the deck down to a solid, dry substrate rather than layering a new roof over compromised material. From there the assembly was built back up: new polyiso rigid insulation boards were secured to the deck with commercial-grade screws and stress plates, a mechanical fastening system that resists wind uplift on an exposed flat roof, and then the EPDM membrane was fully adhered across the field and detailed by hand at every penetration, curb, and wall transition. The rooftop HVAC units, the parapet edges, and the drainage points all received the metal and membrane detailing that keeps a flat roof watertight where it is most likely to fail.

What We Installed (And Why)

EPDM is the industry standard for flat and low-slope commercial roofing, and for good reason: the synthetic rubber compound is inherently flexible, resists UV degradation, and holds its waterproofing through the punishing temperature swings a flat, sun-exposed roof sees in Rhode Island — from below-zero winter nights to ninety-plus-degree summer afternoons. Unlike systems that rely on heat-welded seams, a properly seamed EPDM assembly stays flexible through decades of thermal expansion and contraction. The polyiso insulation beneath the membrane does double duty: it carries a strong R-value that improves the building’s thermal performance and heating costs, and when tapered it also builds positive drainage into a dead-flat roof so water moves to the drains instead of ponding. A fully adhered EPDM roof, built on dry insulation over a sound deck, is engineered to deliver decades of leak-free service — the performance a commercial building has to have.

Project Photo Gallery

project in South Kingstown, RI

South Kingstown, RI — commercial roofing detail

South Kingstown, RI project detail

Completed South Kingstown, RI project

Good To Know: Why is a flat commercial roof restored differently from a residential shingle roof?

Roof pitch determines everything about how a roof is built. A steep residential roof sheds water by gravity, so overlapping shingles are enough. A flat or low-slope commercial roof cannot rely on gravity — water sits and moves slowly — so it needs a continuous, seamed, waterproof membrane rather than overlapping pieces, plus insulation tapered to create drainage where the structure gives none. It also has to accommodate the HVAC units, drains, and parapet walls that live on a commercial roof, each of which is a penetration that must be flashed into the membrane. That is why commercial flat roofing is its own discipline: the failure points, the materials, and the detailing are entirely different from a pitched shingle roof.

Why This Approach Works

Stripping a failing flat roof down to a sound, dry substrate — rather than recovering over wet insulation — is what separates a real restoration from a temporary patch. Building back with dry polyiso and a properly seamed, fully adhered EPDM membrane gives a commercial roof the decades of leak-free performance the building depends on.

Why Pinnacle

Commercial flat roofing demands a contractor certified for the building envelope. Pinnacle installs as a Firestone Building Envelope Certified commercial contractor, to the manufacturer’s specification. We’ve served Rhode Island since 2012, hold a 5.0-star Google rating across 100+ reviews and an A+ BBB rating — see our full credentials.

South Kingstown, Rhode Island

South Kingstown’s commercial corridors — around Wakefield, Kingston, and the Route 1 business districts — are full of the flat-roofed buildings that house the town’s shops, restaurants, and services. For those owners, the roof is infrastructure: when it leaks, the business feels it. A methodical EPDM restoration keeps a South County commercial building dry and operating, with a roof engineered for decades rather than a patch that buys a season. Explore our work across South Kingstown roofing services.