Sustainability Project
KEY
Sika Roofing & Waterproofing’s Projects of the Year competition recognizes outstanding achievement by our approved applicator network in the area of application excellence. POY is a competitive event every year, with 2025 being no exception.
Contractors nationwide submitted entries in the following categories for a chance to win one of the coveted spots:
- Low Slope (New Construction)
- Low Slope (Re-Roof)
- Steep Slope
- Waterproofing
- Sustainability
Sika is proud to be associated with its talented contractor network, and we are truly grateful to have such an amazing core of applicants representing our company and its products. We are confident you will agree that the 2025 winners stand out in their outstanding expertise and finished work.
We offer our sincerest congratulations to the 2025 winners and we salute their dedication to the roofing industry.
Sika Roofing & Waterproofing’s Projects of the Year competition recognizes outstanding achievement by our approved applicator network in the area of application excellence. POY is a competitive event every year, with 2025 being no exception.
Contractors nationwide submitted entries in the following categories for a chance to win one of the coveted spots:
- Low Slope (New Construction)
- Low Slope (Re-Roof)
- Steep Slope
- Waterproofing
- Sustainability
Sika is proud to be associated with its talented contractor network, and we are truly grateful to have such an amazing core of applicants representing our company and its products. We are confident you will agree that the 2025 winners stand out in their outstanding expertise and finished work.
We offer our sincerest congratulations to the 2025 winners and we salute their dedication to the roofing industry.
About the Awards
the winners
Samuel Oschin Air and Space Center
Los Angeles, CA
Letner Roofing Company
Orange, CA
LOW SLOPE
NEW CONSTRUCTION
QTS NAL1 DC1 (Data Center)
New Albany, OH
Cotterman & Company
Columbus, OH
Low Slope
NEw Construction
Narbonne High School
Harbor City, CA
BEST Contracting Services Inc
Gardena, CA
Low Slope Re-Roof
Albertus Magnus High School
Bardonia, NY
Hayden Building Maintance Corp.
Tappan, NY
Low Slope Re-Roof
Hess Tower Turbine Roof
Houston, TX
J.Reynolds & Co., a Tecta America Co
Saginaw, TX
Low Slope Re-Roof
Mitchell International Airport Concourse D
Milwaukee, WI
L. Marshall Roofing & Sheet Metal
Glenview, IL
Low Slope Re-Roof
Stryker Orthopaedics
Mahway, NJ
Tri-State Commerical Roofing Corp.
Hillburn, NY
Low Slope Re-Roof
Carl Schurz Elementary School
New Braunfels, TX
DG Roofing, LLC
Del Valle, TX
Low Slope Re-Roof
Francis M. Leahy Elementary School
Lawrence, MA
Greenwood Industries
Worcester, MA
Waterproofing
Alice Walton School of Medicine
Bentonvillle, AR
Ozark Green Roofs
Fayetteville, AR
Waterproofing
Church of Latter Day Saints - Office Building Plaza
Salt Lake City, UT
Utah Tile & Roofing
Salt Lake City, UT
Waterproofing
Wilkes Passage Condominiums
Boston, MA
Eagle Restoration & Contracting, Inc.
Winthrop, MA
Waterproofing
Sustainability Project
Low Slope
New Construction
Phase 3 of the California Science Center - Samuel Oschin Air and Space Center expansion represents a landmark addition to the museum’s master plan—an approximately 200,000‑square‑foot facility designed to house the Space Shuttle Endeavour and inspire future generations. Letner Roofing delivered the complete roofing scope for this highly visible and architecturally complex project, installing more than 55,000 square feet of Sarnafil PVC roof membrane across five roof levels at varying elevations.
Each section required a purpose‑built solution. Level 3 features a visually striking ballasted assembly of Mexican black pebbles paired with a lead gray self‑adhered Sarnafil membrane, selected for its clean appearance and speed of installation. Level 4, the largest and most technically demanding roof, required detailing extensive pre‑installed ductwork and a 15‑foot wall transition with white self‑adhered Sarnafil PVC flashing. Sikalastic 641 liquid-applied membrane was used as mechanical pads to ensure seamless waterproofing.
Level 7 introduced additional complexity with three distinct components: Sikaplan PVC membrane was used for the interior roofing areas to protect the Endeavour directly below, a Sarnafil Décor Roof system with hot-air welded profiles to look like a standing seam metal roof, and a steep sloped walkway anchored with 81 U‑anchors. Despite the challenging geometry, the finished appearance is both precise and visually impressive.
All roofing systems and components were selected for energy efficiency, sustainability, and California Title 24 compliance. They also meet FM Global requirements and a 90‑mph wind rating. Throughout construction, Letner maintained close coordination with the general contractor, trade partners, and Sika representatives to ensure flawless execution.
The project’s curvilinear architecture and technical demands required constant problem‑solving and craftsmanship. Letner’s work on Phase 3 stands as a testament to innovation, collaboration, and roofing excellence - delivering an “out of this world” system worthy of one of California’s most iconic public institutions.
Samuel Oschin Air and Space Center
Los Angeles, CA
Sustainability Project
Low Slope
New Construction
QTS NAL1 DC1 Building 1, located in New Albany, Ohio, stands as a groundbreaking example of high‑performance roofing innovation with Sika. As the first structure in a two‑building masterplan, the facility establishes a new benchmark for data center construction, integrating advanced roofing technology with the demanding requirements of mission‑critical infrastructure. The 240,000‑square‑foot building includes both office space and a three‑zone data center complex, designed to support exceptional uptime, long‑term reliability, and scalable growth within one of the country’s fastest‑expanding technology corridors.
Cotterman & Company Construction was selected to deliver the roofing scope for this highly technical and highly visible project. Working in close collaboration with Whiting‑Turner, QTS, and Sika’s technical team, Cotterman & Company implemented a fully engineered roof system designed to exceed the stringent performance expectations of large‑scale digital infrastructure. Every component of the assembly was Sika‑specified and Sika‑approved to ensure complete compatibility and long‑term system integrity.
From the structural metal deck upward, the system included a 5/8‑inch gypsum coverboard, a torch‑applied vapor barrier, two layers of 2.6‑inch ISO insulation, a wire mesh leak detection system, a 5/8‑inch ultralight coverboard, and a fully adhered 72‑mil white G 410 Sarnafil PVC roofing membrane. Several hundred feet of integral expansion joints and several thousand feet of metal coping were incorporated to accommodate building movement and ensure perimeter durability across the expansive footprint.
The project’s scale, complexity, and mission‑critical nature required precise coordination, custom detailing, and rigorous quality assurance throughout construction. QTS NAL1 DC1 Building 1 ultimately reflects the highest levels of technical excellence and partnership among QTS, Sika, Whiting‑Turner, and Cotterman. With its innovative system design and meticulous execution, the facility sets a new national standard for Sika’s roofing & waterproofing on critical infrastructure.
QTS NAL1 DC1 (Data Center)
New Albany, OH
The Narbonne High School Roofing Project in Harbor City, California represents a major modernization effort across more than 55 buildings within the Los Angeles Unified School District. Serving the Harbor City and Lomita communities, the campus—known as the “Home of the Victors”—required a roofing program that matched its scale, architectural complexity, and long‑term performance needs.
Best Contracting Services delivered the roofing scope across approximately 3,636 square feet of varied roof structures, including arcades and a combination of high‑ and low‑slope assemblies. Each building received a tailored solution, blending mechanically fastened and fully adhered systems to address unique structural conditions and ensure consistent, durable performance across the expansive campus.
A key milestone of the project was the first‑ever installation of Sarnafil Self-Adhered Feltback membrane in 60mil EnergySmart. This next‑generation technology provides enhanced adhesion, exceptional durability, fire and weather resistance, setting a new benchmark for roofing innovation within the district.
Executing the work in an active school environment required meticulous planning, strict safety management, and seamless coordination. Crews operated during off‑hours to minimize disruption to students and staff, reflecting a strong commitment to safety, efficiency, and collaboration.
The Narbonne High School Roofing Project not only upgraded the campus’s roofing infrastructure but also demonstrated technical excellence, innovation, and disciplined execution—establishing a new standard for educational roofing projects across Los Angeles Unified School District.
Narbonne High School
Harbor City, CA
The 500 Boylston Street Roofing Project in Boston, Massachusetts highlights the precision, creativity, and technical expertise that Commonwealth Building Systems brings to architecturally demanding urban environments. Situated in Boston’s historic Copley Square, the project required a roofing solution that was not only durable and high‑performing but also visually striking—particularly because the seventh‑floor roof is fully visible from the surrounding high‑rise towers. This visibility made the design’s signature feature—a meticulously crafted checkerboard roof—an essential focal point of the installation.
The new roofing system used Sarnafil feltback membrane in white as the base waterproofing layer. The architectural element of the design was the installation of Sarnafil membrane in Lead Grey squares arranged in a precise checkerboard pattern. Achieving this effect required extensive mathematical layout work, exacting measurements, and careful alignment to ensure that the pattern remained perfectly consistent across the entire roof. The result is a roof that is not only watertight but also a unique architectural statement, easily recognizable from above and unlike any typical commercial roofing installation.
The 500 Boylston Street Roofing Project stands as a testament to innovative design, disciplined craftsmanship, and the ability to transform a functional surface into a distinctive architectural feature. Its bold checkerboard identity and flawless execution are a powerful example of the ingenuity and quality that Commonwealth Building Systems consistently delivers. Game of chess, anyone?
500 Boylston Street
Boston, MA
The roof restoration of Albertus Magnus High School in Bardonia, New York, showcases Hayden Building Maintenance Corp.’s ability to solve complex technical challenges while preserving the integrity of an active educational campus. As Rockland County’s only Catholic high school, the facility serves hundreds of students daily, and its aging multi‑elevation roof, originally installed decades earlier by Hayden, had begun to fail, causing leaks in classrooms, the cafeteria, and athletic spaces. The school’s leadership turned once again to Hayden to deliver a long‑term, high‑performance solution.
The project required navigating multiple roof elevations, varied deck types, and sensitive interior spaces. Steel decks over the gymnasium and cafeteria contrasted with gypsum decks in adjacent wings, demanding tailored demolition and repair strategies. Crews removed saturated insulation down to the deck, performed structural repairs, and installed a new Sikaplan PVC roof system with tapered insulation and liquid flashing to address skylights, vertical transitions, and complex interfaces.
Working above fully occupied areas, including the Falcons’ gymnasium and the student cafeteria, required meticulous planning, strict safety controls, and constant coordination with school administrators. Hayden’s teams operated seven days a week to maintain schedule, manage selective tear‑off, and ensure uninterrupted academic and athletic activities.
Completed in July 2025, the project delivered a watertight, energy‑efficient roofing system spanning more than 25,480 square feet. The assembly incorporates Sikaplan 60‑mil white feltback membrane and 2‑inch 20‑PSI Polyiso insulation, providing long‑term durability and improved thermal performance.
Albertus Magnus High School now benefits from a modern roofing system designed to protect its most essential spaces for decades to come. Through craftsmanship, planning, and unwavering commitment, Hayden Building Maintenance Corp. ensured the school remains a vibrant center for learning, athletics, and community life. One would say they performed well above the grade!
Albertus Magnus High School
Bardonia, NY
The replacement of the roof on the iconic Hess Tower wind turbine building in Houston, Texas completed by J.Reynolds & Co. stands as one of the most complex and technically demanding roofing projects in downtown Houston. Located at 1501 McKinney Avenue beside Discovery Green, the tower is a defining feature of the city’s skyline, and its turbine roof—positioned 60 feet above the lower roof and 480 feet above the ground below—required exceptional planning, coordination, and precision.
The scope included removing the existing roof system, lowering debris to the main roof via a material hoist, and installing a new high‑performance assembly: a 31‑mil self‑adhered vapor barrier, a 2.5‑inch insulation layer with 5/8‑inch coverboard, and a fully adhered 80‑mil Sarnafil PVC roof membrane. The elevated geometry and limited access demanded strict sequencing and rigorous safety oversight.
Material delivery was restricted to weekends and required navigating the building interior—transporting loads by elevator to the 27th floor, then through the stairwell to the main roof. With the 28th and 29th floors occupied by corporate executives, interior protection and communication had to be flawless to avoid any disruption.
Once staged, materials were hoisted to the turbine roof, where crews worked through Houston’s unpredictable weather, including sudden storms and high winds that significantly affected installation windows and safety protocols.
The project’s urban constraints, extreme elevation, and weather‑related risks required innovative rigging solutions, meticulous planning, and disciplined execution. The successful completion of the wind turbine roof replacement reflects the highest levels of technical expertise and coordination, delivering a renewed system on one of Houston’s most recognizable architectural features. J. Reynolds & Co. really blew the competition away on this roofing project!
J.Reynolds & Co., a Tecta America Co
Saginaw, TX
Hess Tower Turbine Roof
Houston, TX
The Mitchell International Airport Concourse D roof replacement showcases the expertise, precision, and disciplined execution that L. Marshall Roofing & Sheet Metal brings to highly regulated, mission‑critical environments. Replacing a roof on an active airport terminal required a roofing program that matched the facility’s operational intensity, safety requirements, and architectural complexity—all while ensuring zero disruption to daily airport activity. L. Marshall’s long-standing reputation for craftsmanship and professionalism made them the ideal partner for this demanding installation.
The project involved a full tear‑off down to the roof deck, followed by the installation of an adhered Sarnafil 80‑mil feltbacked membrane in Reflective Gray. Using large 10' x 80' rolls minimized field seams and ensured a clean, uniform finish across long rooftop spans. This system provided the durability, energy performance, and code compliance required for a critical transportation facility. Where detailing became too complex for sheet membrane—particularly along gutter edges and transitions—L. Marshall integrated Sikalastic liquid‑applied membrane to create seamless, watertight flashing connections. This hybrid approach demonstrated their ability to engineer solutions in real time as field conditions demanded.
Working within an active airport environment requires exceptional planning and coordination. Crews navigated strict FAA and TSA safety protocols, controlled access points, and limited work windows, all while maintaining a safe jobsite and uninterrupted airport operations. Their union craftsmen executed the installation with precision, from handling oversized membrane rolls to delivering flawless detailing in challenging areas.
The Mitchell International Airport Concourse D project stands as a model of technical excellence, safety leadership, and adaptive problem‑solving—an achievement that reflects the commitment and capability of L. Marshall Roofing & Sheet Metal. A roof installation like that is one to be admired while taking off and landing! Now boarding!
Mitchell International Airport Concourse D
Milwaukee, WI
When one of the world’s most specialized medical technology companies sought to upgrade the roofing systems across its expansive New Jersey campus, Stryker Corporation in Mahway, NJ turned to TriState Commercial Roofing Corp. for a solution. The project required far more than installing new roof coverings; it demanded a comprehensive, precisely managed approach that paired Sika’s high performance roofing solutions with TriState’s technical expertise, disciplined communication, and ability to work without disrupting Stryker’s around the clock operations.
The 38‑acre campus presented several unique challenges, beginning with the need to maintain uninterrupted access for employees, visitors, and medical professionals attending global training seminars. To support this, Sika coordinated closely with Tri‑State to ensure deliveries were scheduled with exacting precision, allowing work to progress smoothly alongside daily activity. Noise restrictions above key areas of the facility added another layer of complexity, requiring Tri‑State to strategically install fully adhered and mechanically attached systems tailored to each building’s needs. All assemblies were engineered and approved by Factory Mutual (FM) testing, exceeding the stringent 165 PSF wind uplift requirements.
Sika’s single-ply PVC membrane, Sarnafil, was selected for every roof section due to its exceptional watertight performance, durability, and long‑term protection. Before installation, Tri‑State conducted infrared scans and core cuts to identify saturated insulation, ensuring all compromised materials were replaced. Across more than 350,000 square feet, Tri‑State installed fully adhered and mechanically attached Sarnafil roofing systems, each detailed with new Kynar‑coated edge metal flashing.
Throughout the project, Tri‑State maintained rigorous quality control and dedicated on‑site supervision, all while ensuring Stryker’s operations continued without interruption. Today, the facility is protected by a state‑of‑the‑art Sarnafil roofing system engineered to perform for decades, standing as a testament to Tri‑State’s craftsmanship, technical excellence, and ability to deliver complex projects with precision and professionalism.
Stryker Orthopaedics
Mahway, NJ
The Carl Schurz Elementary School roofing project in New Braunfels, Texas required a full replacement of the school’s roof system. The new system needed to provide a durable, high‑performance solution designed to support long‑term reliability for an active educational environment. The roof area spanned approximately 30,000 square feet and with the help of DG Roofing this project was completed over a six‑month period, from May to November 2025.
The scope began with the comprehensive removal of the existing roofing assembly, followed by the installation of a torch‑applied SikaShield modified bitumen system with white granules selected for its energy efficiency, proven durability, weather resistance, and suitability for large public facilities. This system provides strong protection against temperature fluctuations, heavy rainfall, and daily operational demands—key considerations for a school roof expected to perform year‑round.
The new assembly was installed with precision and consistency across the full roof area, ensuring energy‑efficient performance and long‑term system integrity. The torch‑applied SikaShield modified bitumen membrane offers enhanced adhesion and resilience, creating a robust waterproofing layer capable of withstanding the region’s climate conditions.
The Carl Schurz Elementary School project and DG Roofing reflect disciplined execution, thoughtful material selection, and a commitment to delivering a reliable roofing system that will serve the school community for years to come.
Carl Schurz Elementary School
New Braunfels, TX
The Walter E. Washington Convention Center roof replacement represents a landmark effort in scale, coordination, and technical execution—an achievement made possible through the leadership and expertise of Patuxent. Spanning roughly 800,000 square feet across 96 individual roof sections, the project required a roofing program that matched the facility’s size, architectural complexity, and continuous operational demands. With the Convention Center hosting events on more than 70% of construction days, the team developed a highly sequenced plan that ensured safety, minimized disruption, and maintained full functionality of this major civic venue.
The project’s challenges were significant: aging roofing systems in varied conditions, intricate transitions between roof sections, and unique architectural elements that required customized installation methods. Through a design‑build partnership, the Patuxent, DRH, and Range teams combined engineering, consulting, and construction expertise to deliver a durable, solar‑ready Sarnafil roofing system tailored to the building’s long‑term needs.
Most of the facility received a complete re‑cover assembly featuring upgraded insulation, high‑density cover boards, and an 80‑mil Sarnafil PVC membrane selected for its durability, UV resistance, and compatibility with future solar integration. Two areas demanded especially innovative solutions: the steep, highly visible South Barrel Roof—requiring specialized hoisting, access pathways, and precision hot-air welding for watertight seams—and the Mechanical Roof, which underwent a full tear‑off and reconstruction while maintaining uninterrupted mechanical operations.
Executing this work over an active convention center required rigorous safety planning, daily hazard analyses, and close coordination with Events DC, resulting in zero major incidents. The completed system enhances energy performance, extends service life, and positions the facility for future sustainability initiatives.
The Walter E. Washington Convention Center project stands as a model of technical excellence, disciplined execution, and long‑term value—an accomplishment that reflects the innovation and commitment Patuxent brings to every project.
Walter E. Washington Convention Center
Washington, DC
The Solnit Children’s Center roof replacement highlights the technical expertise, creativity, and problem‑solving ability that Silktown Roofing brings to complex institutional projects. The facility was originally designed with a standing seam metal roof in mind due to the required long‑term performance with aesthetic appeal. Silktown proposed a similar alternative with the Sarnafil Décor Roof System which offers both the long-term performance and aesthetics but also offers water-tight integrity with the hot-air welded seams of a single-ply membrane. Recommended in a Patina Green color with the profile ribs—an approach ultimately accepted by both the designer and the State—delivering a durable, visually appealing roof that complements the campus’s therapeutic environment.
The Albert J. Solnit Children’s Center – North Campus serves adolescent males with significant psychiatric needs, providing a structured, trauma‑informed program that bridges the transition from hospital to home or community. The 67‑acre campus in Middletown, Connecticut includes residential buildings, educational spaces, and therapeutic facilities, all of which rely on safe, resilient infrastructure to support daily operations. With approximately 85,000 square feet of roofing to replace, the project demanded a system that could withstand long‑term exposure while maintaining a calm, cohesive architectural appearance.
Silktown installed the Sarnafil Décor Roof System in Patina Green, enhanced with the profile ribs to replicate the look of standing‑seam metal while offering the proven performance of PVC. This alternate not only reduced complexity and long‑term maintenance but also provided a uniform, high‑quality finish across multiple buildings. The installation required careful coordination to maintain campus operations, protect sensitive program areas, and ensure a safe environment for staff and residents.
The Solnit Children’s Center project stands as an example of thoughtful design, technical excellence, and collaborative problem‑solving—an achievement that reflects the innovation and commitment Silktown Roofing brings to every project.
Solnit Children's Center
Middletown, CT
The Pittsburg Terminal Modernization Project (TMP) and Multimodal Complex (MMC) represent a major investment in upgrading two essential transportation facilities with state‑of‑the‑art roofing systems. Phoenix Roofing was selected to deliver the complete roofing scope, marking the largest undertaking in the company’s history with more than 500,000 square feet of Sarnafil roof membrane installed across both sites.
For the new TMP main terminal, the team constructed a high‑performance assembly designed for long‑term durability and energy efficiency. The system includes a vapor barrier, two layers of 3‑inch Sarnatherm ISO insulation, ½‑inch DensDeck Prime Coverboard, and an 80‑mil Sarnafil PVC membrane installed using the induction welded Rhinobond fastening system. Perimeter edge metal was provided by Sika and the completed roof assembly qualifies for a 30‑year, 90‑mph wind warranty.
The MMC project features several roof areas, each tailored to its specific structural and operational needs. A typical assembly consists of a concrete deck, self-adhered vapor barrier, two layers of 2.6‑inch Sarnatherm insulation, ½‑inch Sarnatherm HD ISO (fully adhered), and a 60‑mil Sikaplan adhered membrane. Both the TMP and the MMC systems were selected for their individual proven performance requirements, thermal efficiency, and ability to withstand demanding environmental conditions.
Execution of the TMP/MMC modernization required more than 18,000 man‑hours over 2.5 years, with phased installation carefully coordinated to maintain facility operations and safety. The project’s scale and complexity demanded precise planning, collaboration with trade partners, and consistent quality control.
Upon completion, both facilities will benefit from modern, resilient roofing systems that enhance structural reliability, improve energy performance, and reduce roof maintenance. Thanks to Phoenix Roofing, the region’s transportation infrastructure is ready to support the local community for decades to come.
Pittsburgh TMP and MMC
Pittsburgh, PA
Francis M. Leahy Elementary School in Lawrence, Massachusetts showcases an innovative approach to maximizing limited space by transforming a regularly unused rooftop into a fully functional playground. Bordered by private homes and the Spicket River, the school had no available ground area for recreation, leading to the creation of a Hydrotech protected rooftop play environment that now occupies nearly 75% of the building’s roof. This elevated space completed by Greenwood Industries provides students with safe, durable play areas and sweeping views of their community.
The Hydrotech hot-rubberized asphalt waterproofing system utilizing Monolithic Membrane 6125 was engineered to support active daily use and withstand harsh New England winters. The assembly includes 90‑mil and 125‑mil thick MM 6125, Flex‑Flash F, Hydroflex RBII with Spinout, Hydrodrain 990, and two layers of 3‑inch DuPont XPS Styrofoam. Above the waterproofing and insulation, pavers and specialty play surfacing create zones for basketball, a jungle gym, slides, general play, and outdoor seating.
The remaining roof areas received a Sarnafil 80‑mil PVC adhered system, selected for its energy‑efficient performance—an important consideration for a public school. Installed over DensDeck Prime, the Sarnafil roof system protects the stair towers, mechanical equipment, and the large section directly beneath the playground.
The project required extensive coordination due to the rooftop playground design. Safety fencing, landscaping crews, and multiple trades worked simultaneously within a tight footprint, increasing logistical complexity. Despite these challenges, the roofing team executed both the Hydrotech and Sarnafil systems with precision.
The result is a thoughtfully designed rooftop playground supported by a robust, long‑lasting roofing assembly—an elevated space that enhances student life and sets a new standard for creative use of school infrastructure. For the Francis M. Leahy Elementary School, Greenwood Industries receives an A++ in workmanship!
Francis M. Leahy Elementary School
Lawrence, MA
The Alice L. Walton School of Medicine (AWSOM) in Bentonville, Arkansas, features one of the most ambitious green roof systems in the regionally expansive, two‑acre living landscape installed by Ozark Green Roofs. As the signature element atop the 154,000‑square‑foot medical education building, the roof was designed to merge architecture, ecology, and wellness, reflecting the school’s mission to integrate human health with environmental stewardship.
Conceived as an extension of the surrounding Ozark terrain, the green roof’s rolling topography and diverse plant palette create a seamless connection between the natural landscape and the built environment. Native and adaptive species were selected for year‑round resilience, pollinator support, and stormwater performance, transforming the roof into both a functional ecosystem and a restorative outdoor experience for students and faculty.
Beneath the plantings, a robust waterproofing and overburden assembly ensures long‑term durability. Ozark Green Roofs installed a Monolithic Membrane 6125 waterproofing system, paired with DuPont Styrofoam insulation, Geofoam lightweight fill, Hydrodrain 700 drainage composite, and Hydroflex 30 protection course. LiteTop growing media and architectural pavers complete the assembly, supporting varied programmatic spaces including outdoor classrooms, contemplative gardens, and gathering terraces.
The green roof also plays a critical role in stormwater management, capturing and filtering rainfall to reduce runoff and improve water quality—an essential function in Bentonville’s rapidly developing urban context. Its vegetated assembly enhances energy performance as well, reducing heat gain and contributing to a healthier indoor environment.
As a multifunctional landscape, the roof supports research, wellness, and education, offering opportunities to study plant performance, biophilic design, and environmental health. Through thoughtful execution and craftsmanship, Ozark Green Roofs helped deliver a resilient, high‑performing system that will serve AWSOM’s community for decades to come.
Alice Walton School of Medicine
Bentonvillle, AR
Ashley Thompson Photography
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.
South Station Tower
Boston, MA
Utah Tile & Roofing continued their longstanding partnership with the Church of Jesus Christ of Latter‑day Saints through their work on the Church Office Plaza renovation, a signature project located in the heart of downtown Salt Lake City. Serving as the primary exterior gathering space for the Church Office Building, the plaza sits atop an expansive underground parking structure, making waterproofing performance and long‑term durability essential. Drawing on decades of experience with LDS projects—including the Conference Center and the Provo Tabernacle renovation—Utah Tile & Roofing delivered a comprehensive, high‑performance solution tailored to the plaza’s architectural and functional demands.
The renovation encompassed more than 200,000 square feet of plaza deck, all of which received Hydrotech Monolithic Membrane 6125 waterproofing, Hydroflex protection sheet, and Hydrodrain/Garden Roof components. These assemblies were selected for their proven longevity, monolithic application, and compatibility with both hardscape and vegetated roof systems. The project also extended into the adjacent Main Street Plaza, integrating water features, pedestrian pathways, and landscaped areas that required careful detailing at transitions, planters, and structural interfaces. Because the plaza connects directly to Temple Square—one of Utah’s most visited public spaces—maintaining a seamless aesthetic while ensuring robust waterproofing performance was a central priority.
Executing the work over an active parking structure required meticulous coordination, phased access planning, and continuous collaboration with the general contractor and design team. The resulting plaza is both visually refined and technically resilient, supporting daily foot traffic, event use, and year‑round landscaping needs. Utah Tile & Roofing’s contribution to the Church Office Plaza renovation reinforces their reputation for craftsmanship, reliability, and excellence on some of the LDS Church’s most prominent and demanding projects.
Church of Latter Day Saints - Office Building Plaza
Salt Lake City, UT
The Lady of the Sea Hospital in Cut Off, Louisiana is a liquid‑applied Sikalastic roofing project that marked the first collaboration between Roofing Solutions LLC and Sika. This project quickly became a showcase of technical expertise, adaptability, and high‑quality workmanship. From the outset, the team faced significant challenges due to the building’s complexity, the hospital environment, and the expansive 76,094‑square‑foot roof area. Achieving a smooth, uniform surface and consistent liquid membrane thickness across such a large footprint required meticulous preparation, precise application techniques, and continuous quality control.
The Sika solution chosen to protect the hospital was a Sikalastic 641 Low VOC liquid system with Sika Reemat Premium reinforcement and Sika Joint Tape SA in both 3‑inch and 6‑inch widths. Managing substrate moisture within the concrete deck slab presented a major challenge. The team conducted careful monitoring and moisture mitigation to ensure proper adhesion and curing of the system. Weather conditions added further complexity, requiring strategic scheduling and protection measures to maintain progress without compromising quality.
Throughout the project, Roofing Solutions worked closely with Sika’s technical advisors—from procurement through final inspection—to ensure every phase met the manufacturer’s highest standards. The use of a low‑VOC primer and coating system aligned with the owner’s sustainability goals while supporting safer air quality during installation, an essential consideration in an active healthcare setting. Roofing Solutions LLC successfully navigated environmental, logistical, and technical obstacles to deliver a durable, sustainable, and impeccably installed liquid-applied Sikalastic‑system solution. The project stands as a benchmark for future collaborations and a testament to the team’s commitment to excellence.
Lady of the Sea Hospital
Cut Off, LA
Wilkes Passage Condominiums, a luxury residential building in Boston’s South End, features an expansive second‑floor terrace finished with concrete pavers, stone ballast, and large garden planters. After years of exposure, the existing EPDM system had begun to fail, prompting architect Eck MacNeeley to bring in Roof Design and Inspection, Inc. (RDI) for a more resilient waterproofing solution. Andy Houle of RDI recommended a fluid‑applied Sikalastic RoofPro system to deliver long‑term protection while preserving the terrace’s design intent.
Eagle Restoration of Winthrop was selected to install the new system. Because the concrete deck had absorbed moisture from prolonged water infiltration, the team began with Sikalastic GDC (Green, Damp Concrete) primer to stabilize the substrate. They then applied Sikalastic 644 RoofPro membrane with Sika Fleece 170 reinforcement, creating a seamless, durable waterproofing assembly capable of supporting significant overburden.
To rebuild the terrace, Sika Drainage Mat 420 was installed over the new RoofPro system, followed by new XPS insulation and Sika fleece filter fabric. Eagle Restoration then reinstalled more than 200 tons of existing stone, pavers, and planters, while Recover Roofs refreshed the landscaping with new plantings to restore the terrace’s vibrant outdoor environment.
The completed system incorporates a full suite of Sika components—including EP Primer, GDC Primer, Sika Concrete Primer Lo-VOC, Sikaflex 11FC, Sika Joint Tape, and Sarnafelt NWP Separation Layer ensuring compatibility and long‑term performance. With the new RoofPro assembly in place and Eagle Restoration’s craftsmanship throughout, Wilkes Passage residents can now enjoy a revitalized terrace and years of worry‑free waterproofing protection.
Wilkes Passage Condominiums
Boston, MA
Title of the Project Winner Goes to Second Line
Location, ST
Contractor Company Info goes to second line eventually
Project
Category
Sustainability Project
Low Slope
New Construction
Paste here
Project Winner Going to a Second Line Most Likely
City Name Here, ST
A big THANK YOU to all of the POY contractor participants!
Sika is a worldwide leader in manufacturing resilient and sustainable roofing solutions for commercial construction projects. The roofing system plays an essential role in the protection of a building. Ultraviolet rays, extreme weather, and ponding water all conspire to compromise the roof prematurely, leading to leaking, damage to the building, costly repairs, and possibly an early tear-off and re-roof.
Sika responds to these challenges by offering a variety of system technologies from single-ply PVC membranes to hot and cold liquid-applied membranes, our products, systems, and services are designed to meet the needs of any building owner all over the world.
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