With a reputation for innovation, SL Rasch GmbH excels in providing creative design and engineering solutions, notably in the fields of lightweight and special structures. The company, which was founded by Mahmoud Bodo Rasch in 1980, is renowned for its fusion of innovative technology, precise engineering, and artistic elements, often inspired by Islamic architectural traditions.
“SL Rasch has a strong focus on projects in the Middle East, particularly in Saudi Arabia. Our work frequently integrates elements of Islamic architecture, making it particularly well-suited for projects involving religious or cultural significance,” says Stefan Schöne, Head of Engineering at SL Rasch.
One of SL Rasch’s most notable projects is the design and installation of giant, retractable umbrellas at the Prophet’s Mosque in Medina, Saudi Arabia. The technical brilliance and aesthetic allure of the umbrellas converge harmoniously, providing a peaceful sanctuary from the scorching sun for countless worshippers.
Mastering Lightness: Architecture Inspired by Nature
In the past, the firm has worked closely with the pioneer of lightweight construction, Frei Otto, who passed away on 9 March 2015, at the age of 89. Otto’s death came just days before he was announced as the laureate of the 2015 Pritzker Architecture Prize, one of the most prestigious awards in architecture. His legacy, though, lives on, with Stefan explaining: “His work, characterized by a harmonious blend of nature´s laws and conditions, paired with engineering excellence, fundamentally reshaped architectural thinking in the 20th century. He always looked for the most obvious, practical and long-lasting solutions, without approaching projects primarily from a design perspective. His designs, which were often inspired by natural shapes like soap skins or suspended structures, showed that lightweight construction was aesthetically pleasing and highly efficient at the same time. By focusing on efficiency, minimal materials, and the emulation of natural shapes, Otto revolutionized modern architecture and created some of the most iconic and groundbreaking structures. His work continues to be highly relevant and influential.”
In the past, the firm has worked closely with the pioneer of lightweight construction, Frei Otto
Otto created minimum surface shapes that resulted in the least amount of material being used to achieve maximum structural efficiency. This method was not only concerned with resource conservation but also with crafting structures that were sleek, transparent, and lightweight. He employed advanced structural analysis and experimentation, often using models to test the limits of materials under tension. This allowed him to develop structures that were incredibly light yet strong.
Perhaps his most famous project was the Munich Olympic Stadium (1972). With its striking tensile roofs composed of acrylic glass and cables, this undertaking showcases Otto’s signature form-finding technique and economical use of materials.
“This is a philosophy that SL Rasch continues to promote today,” says Stefan. “with our work often involving the use of advanced materials and technologies, such as lightweight composites, high-strength fabrics, and complex structural analysis techniques. Furthermore, our close partnerships with institutions, laboratories and materials scientists enable us to push the boundaries of lightweight convertible or mobile architecture, allowing us to consistently deliver projects that defy expectations.”
Creating Iconic Spaces with Precision and Purpose
The company’s architectural designs prioritize customer and user needs as well as integration into the existing environment with the utmost respect. With the Sliding Domes, for example, SL Rasch has designed movable high-tech domes with a traditional appearance, located also in the Prophet’s Mosque in Medina. During the day, they shade the 27 square inner courtyards and protect pilgrims from direct sunlight; at night, the domes are opened and cold air can flow in to cool down the building. An innovative mechanism for the domes, which move on guide rails, allows them to be opened or closed within a minute. This project is a perfect example of SL Rasch’s dedication to integrating cultural and religious symbolisms into their innovative designs.
Our close partnerships with institutions, laboratories and materials scientists enable us to push the boundaries of lightweight convertible or mobile architecture
“SL Rasch has designed several retractable roof systems for mosques and other environments, allowing spaces to be used comfortably in varying weather conditions. Thanks to the adaptability of the structures, an optimal climate can be created with minimum energy input, even under extreme external conditions,” says Stefan. “Saudi Arabia is an increasingly important market for SL Rasch because of the country’s ambitious development projects, its focus on expanding religious and cultural infrastructure, and the demand for innovative architectural solutions that align with the region’s climatic and cultural needs.
“We have specialized expertise in designing structures that enhance the functionality and comfort of these sacred spaces, such as the giant retractable umbrellas at the Prophet’s Mosque in Medina or the tent city in Mina for the temporary accommodation of more than 2 million pilgrims during Hajj, offering safety, comfort and hygiene. This unique capability aligns perfectly with Saudi Arabia’s goals of improving the pilgrimage experience.”
Designing the Future of Lightweight Architecture
By seamlessly blending modern engineering and Islamic architectural elements, SL Rasch’s designs not only serve a functional purpose but also deeply resonate with Saudi Arabia’s commitment to preserving Islamic heritage while embracing progress.
“SL Rasch has designed several retractable roof systems for mosques and other environments”
Thanks to its track record of success and expertise in delivering pioneering projects, SL Rasch has become the preferred partner for high-profile ventures in Saudi Arabia, earning the trust and support of local stakeholders.
“Our expertise in engineering custom lightweight structures tailored to specific needs sets us apart, providing Saudi projects with unique, technologically advanced solutions that are not easily replicated by other firms,” Stefan says.
SL Rasch has become the preferred partner for high-profile ventures in Saudi Arabia
SL Rasch’s ability to engineer custom lightweight structures is based on detailed planning, a scientific design approach and careful material selection, which positions it as an essential partner for Saudi Arabia’s future projects, in line with the nation’s sustainability objectives. The firm’s emphasis on designing long-lasting functional and visually appealing structures, following nature´s rules combined with innovative technology and a timeless design approach, pay homage to Frei Otto’s legacy of efficiency, minimal material usage, and the integration of organic shapes in his revolutionary architectural designs. Following Otto´s approach, SL Rasch explores radically new approaches to reach true innovation instead of optimizing existing solutions.
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