The South Station Tower in Boston, Massachusetts is a landmark mixed‑use development rising above Boston’s busiest transportation hub. The 51‑story, 690‑foot tower brings more than 700,000 square feet of high‑end office space, 166 luxury residences, and a private one‑acre rooftop Sky Park to the city skyline, all while transforming the historic South Station complex with expanded bus facilities, upgraded transit connections, and a new grand concourse known as “The Great Space.”

Heritage Restoration was selected to deliver comprehensive roofing and waterproofing across 29 distinct roofs and terraces spanning 22 levels. The scope included swimming pool decks, gathering terraces, green roofs, balconies, low‑slope roofs, ventilation areaways, and a seeded roof. In total, Heritage installed 6½ miles of Flex Flash‑UN membrane along with Hydrotech Monolithic Membrane 6125, Hydroflex 30, Hydrocap 160FR, and other high‑performance Sika components covering over 150,000 square feet.

The project’s complexity demanded precision. The 11th‑floor garden roof alone featured 13 styles of expansion joints with specialty inlays, and fire blankets integrated into the Hydrotech system. On the 36th floor, a depressed slab received a full MM6125® installation and underwent a 72‑hour water test across 4,000 ft² before the swimming pool was placed. The 50th‑floor terraces required leading‑edge fall protection and performed in high‑wind conditions, incorporating MM6125®, Hydroflex 30 protection courses, and steel‑sheathed perimeter terminations.

Across the tower, Heritage installed over 100,000 ft² of Hydrotech Monolithic Membrane 6125 on roofs with varying finishes—from stone and porcelain pavers to green roof assemblies with six inches of growing media.

Supported by Heritage Restoration and a wide range of Sika products, the South Station Tower is now protected by proven, high‑performance waterproofing designed to endure for decades at the very center of Boston’s transit network.