See how a translucent silicone coating helped protect the Kimbell Art Museum roof while preserving its historic appearance.
The Kimbell Art Museum in Fort Worth, Texas, is widely recognized as one of the most celebrated works of architect Louis Kahn. Completed in 1972, the museum's distinctive vaulted concrete structures and lead-coated copper roof have become defining features of the building's architectural identity.
When the museum sought a solution to help prevent lead runoff from the roof system, preserving the appearance of the original design was a key project requirement.
Optic™ Translucent Coating was selected to help encapsulate the metal roof surface, providing long-term protection while maintaining the roof's distinctive aesthetic.
Designed by Louis Kahn, one of the most influential architects of the 20th century, the Kimbell Art Museum is known for its innovative use of natural light.
The building consists of a series of vaulted concrete structures topped with lead-coated copper roof sheathing. Skylights positioned along the apex of each vault allow daylight to enter the galleries, where it is diffused across the concrete interiors to create the soft illumination that has become synonymous with the museum experience.
Because the roof system plays such an important role in the building's appearance and performance, any restoration or protection strategy needed to minimize visual impact.
Over time, lead-coated metal roofs can contribute to runoff concerns that may affect surrounding areas.
The museum required a solution that could help address lead runoff while preserving the visual character of the roof. Traditional renovation or replacement approaches could have altered the appearance of the building and required more extensive intervention.
The project therefore called for a solution capable of delivering long-term protection while maintaining the original architectural aesthetic.
Optic™ translucent coating was selected because it allowed the roof system to be protected without significantly changing its appearance.
The coating forms a 100% silicone elastomeric membrane designed to remain:
Unlike opaque coatings, the translucent formulation allows the underlying substrate to remain visible, making it particularly well suited to historic buildings, architectural landmarks, and other projects where aesthetics are an important consideration.
In addition to helping address lead runoff concerns, Optic coating offers a long-term alternative to more invasive renovation or replacement projects.
The low-VOC coating can typically be applied with minimal surface preparation and without a primer. It may be installed using a roller, power roller, spray equipment, or brush and can become rain-ready in as little as 30 minutes.
The coating can also be applied to skylights, allowing light transmission while helping protect against leaks.
One of the most notable aspects of this project is the opportunity to evaluate long-term performance in the field.
During a site visit conducted in 2025, more than ten years after installation, the coating and roof system remained in excellent condition.
According to waterproofing consultant Harper Brawner:
"The install is over ten years old and looks like new. There is no evident loss of film thickness or reversion of the coating. We installed the coating as a low sheen to keep the look of the coated copper, and the sheen level looks just like when installed. The coating has arrested the sloughing off of the lead coating."
This observation provides a real-world example of how a translucent silicone coating can help deliver long-term performance while preserving the appearance of a historic roof system.
In 1998, the Kimbell Art Museum received the Twenty-Five Year Award from the American Institute of Architects. The award recognizes buildings that have demonstrated enduring architectural significance and continued excellence over time.
Architect: Louis Kahn
Waterproofing Consultant: Harper Brawner
What is a translucent roof coating?
A translucent roof coating is a protective coating that allows the appearance of the underlying substrate to remain visible while providing weatherproofing and durability benefits.
Why use a translucent coating on a metal roof?
Translucent coatings can help protect metal roofs while preserving their original appearance. This makes them particularly useful for historic buildings, architectural landmarks, and visually distinctive structures.
Can silicone coatings help address lead runoff?
Silicone coatings can be used to encapsulate certain roof surfaces, helping create a protective barrier that may assist in reducing lead runoff from coated substrates.
How long do silicone roof coatings last?
Service life depends on the substrate, environmental conditions, and maintenance practices. However, silicone coatings are widely recognised for their long-term resistance to UV exposure, weathering, and temperature extremes.
Can silicone coatings be used on historic buildings?
Yes. Silicone coatings are often considered for historic and architecturally significant buildings because they can provide protection while minimising changes to the building's appearance.
What are the benefits of silicone roof coatings?
Silicone roof coatings can help provide waterproofing, UV resistance, flexibility, weather resistance, and long-term durability while reducing the need for more invasive roof replacement projects.
Performance results are those of customer reported accounts, and are not to be relied upon as typical or expected under any other circumstances. Performance results will vary depending upon a number of process-related factors. Prospective customers should rely solely upon their own evaluative techniques to determine what processing parameters are attainable and optimal to their specific needs. Further note that Momentive is not endorsed by or affiliated with any ownership authority of Kimbell Art Museum.
P.E., CSI, Líder de Desenvolvimento de Aplicações na Momentive Performance Materials Inc. Membro: IIBEC, ASTM C24, ISO TC59/SC8
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