Like most Pinnacle roofing projects, the work was completed in a single day — minimizing disruption for the homeowner.

Pinnacle makes every project affordable with monthly financing options, including 0% interest for 18 months.

A Fox Run property in West Greenwich had two very different roof problems on one site: a low-slope section that needed a proper commercial-grade flat-roof system, and a sloped section due for new shingles. We restored the low-slope area with a modified-bitumen (mod-bit) rolled-asphalt membrane and finished the pitched roof in CertainTeed Landmark PRO and NorthGate shingles in Georgetown Gray — the right system for each part of the building.

Scope of Work

Low-slope and steep-slope roofs fail in different ways, so we approached each on its own terms. On the flat section we prepped the substrate, laid a self-adhered base sheet, and installed a fully-adhered modified-bitumen membrane, giving special attention to the seams, edges, and flashing details where standing water and wind-driven rain attack a low-slope roof. On the pitched section we tore off to the deck, ran ice-and-water shield and synthetic underlayment, and installed the Georgetown Gray shingles with new flashing and ridge cap. Handling both the flat and sloped areas together is exactly the kind of mixed commercial roofing and repair work our crews are built for.

What We Installed (And Why)

Modified bitumen is the workhorse of low-slope roofing because a flat or gently pitched roof can’t shed water the way a steep roof does — it has to hold a continuous, watertight barrier. A self-adhered base followed by a fully-adhered mod-bit membrane creates exactly that: a tough, multi-layer surface with sealed, reinforced seams engineered to sit under ponding water and resist the freeze-thaw cycles that split cheaper single-ply patches. On this section it’s the difference between a repair that lasts and one that leaks by the next hard rain.

For the pitched roof, CertainTeed Landmark PRO and NorthGate deliver the strength this project called for. Landmark PRO is a heavier-weight architectural shingle, while NorthGate is built with SBS-modified (rubberized) asphalt for enhanced cold-weather flexibility and impact resistance — a smart pairing for New England. Both wear the same Georgetown Gray, a warm, layered mid-gray that keeps the whole building reading as one cohesive project despite the two different roof systems underneath.

Project Photo Gallery

Detached garage with fresh Georgetown Gray roof, West Greenwich

Mod-bit flat roof membrane installation, West Greenwich

Rear elevation of completed West Greenwich home

Good To Know: Why can’t you just shingle a low-slope roof?

Because shingles rely on gravity and steep pitch to shed water, and a low-slope roof doesn’t give them that. On a shallow pitch, water moves slowly, pools, and can work backward under shingle laps — which is why asphalt shingles will leak on a roof that’s too flat, no matter how well they’re installed. Low-slope areas need a fully-adhered membrane system like modified bitumen, where the whole surface is sealed and the seams are welded or bonded watertight. Matching the roofing system to the roof’s pitch is one of the most important calls on any mixed-roof building.

Why This Approach Works

The strength of this project is that each roof got the system it actually needs instead of one compromise applied everywhere. The mod-bit membrane gives the low-slope section a sealed, ponding-resistant surface, while the Landmark PRO and NorthGate shingles give the pitched section durable, cold-flexible coverage — all tied together visually by a single Georgetown Gray tone. That’s how a building with mixed roof geometry ends up fully watertight and looking intentional, rather than patched.

Why Pinnacle

Pinnacle Roofing & Skylights has handled Rhode Island’s roofs — residential, commercial, and low-slope — since 2012. We’re Firestone Building Envelope Certified and a licensed Mule-Hide and Gaco applicator, so low-slope membrane work like this mod-bit system is installed to manufacturer standards. We hold a 5.0-star Google rating with 100+ five-star reviews, an A+ BBB rating, and NRCA and RIBA membership, and we’re fully licensed in Rhode Island (Commercial Lic #261, Residential Lic #39446) for exactly this kind of mixed project.