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Fire safety of charred timber facades

In an era of sustainable construction and architectural innovation, charred timber is gaining popularity as a building facade material. This ancient Japanese technique, known as "Shou Sugi Ban" or "Yakisugi," not only provides a striking aesthetic but also enhances the wood's durability and resistance to insects and decay. However, its application in modern architecture necessitates rigorous fire safety engineering methods to ensure compliance with stringent building regulations. ÖRUGG is responsible for fire safety in this groundbreaking project incorporating this method in cooperation with s. ap Architects and Félagsbústaðir Social Housing.

Charred timber, despite its enhanced resistance to natural elements, poses unique challenges in terms of fire safety. The charring process creates a carbon layer that can act as a fire retardant, but comprehensive fire safety engineering is crucial to address potential risks. Modern fire safety engineering methods involve a multi-faceted approach to ensure that charred timber facades meet safety standards without compromising design integrity.

Firstly, a detailed fire risk assessment is conducted, taking into account the building's location, height, and occupancy type. This assessment identifies potential fire hazards and determines the necessary fire resistance ratings for the timber cladding.

Secondly, the timber is charred, penetrating the surface and providing protection by slowing the spread of flames and reducing smoke production.

Additionally, the design and installation of the facade incorporate strategic fire barriers and compartmentalization. This involves placing non-combustible materials at critical junctions, such as around windows, doors, and between floors, to prevent fire from spreading across the facade.

Furthermore, modern fire safety methods utilize innovative simulation tools to model fire behavior and evaluate the effectiveness of fire protection strategies. These simulations help engineers optimize the facade design, ensuring that it can limit fire spread for a designated period, providing occupants with sufficient time to evacuate safely.

Firespread after 10 minutes with ordinary timber (left) and charred with 60sm non-combustible barrier (right)

Sustainability is another significant advantage of using charred timber for building facades. Reusing timber, reduces the demand for new materials, thereby conserving natural resources and minimizing deforestation. The charring process itself is environmentally friendly, as it does not require chemical preservatives and extends the lifespan of the wood. By incorporating reused timber, the construction industry can significantly lower its carbon footprint, contributing to more sustainable building practices.

Incorporating these advanced fire safety engineering methods, charred timber facades can be both a beautiful and safe choice for contemporary buildings, aligning sustainable practices with rigorous safety standards. This blend of tradition and innovation promises to shape the future of architectural design, proving that aesthetics, safety, and sustainability can coexist harmoniously.