Can reeds be used as modern façade cladding? Well yes!
But working with reeds can definitely raise some questions. So here are some of the ones we had to ask ourselves during the design process:
1️⃣ How are fire requirements met for a thatched façade?
The façade has undergone a full-scale fire test at DBI The Danish Institute of Fire and Security Technology. There's no active fire protection on the façade, but it is divided into seven vertical fireproof sections, approximately 1 meter in width, as seen in the images.
2️⃣ Is the facade treated with fire-retardant impregnation?
No, the reeds is 100% natural.
3️⃣ What is the lifespan of a thatched facade?
If ventilated, approximately 30 years. If not ventilated, around 20 years.
4️⃣ How is the facade protected against moisture and mold?
Firstly, the reeds itself is naturally water-resistant with a waxy coating that helps it shed water. Secondly, when thatched, it is layered to encourage water to run off the facade, rather than seeping through. This is done by creating a steep pitch and overlapping each layer of thatch.
5️⃣ Does the thatched facade contribute to the U-value of the building envelope?
Yes, however, it is relatively small, which is why the school in Sundby does not have reduced insulation in the rest of the facade construction.
The project is developed in close collaboration with skala architecture, Artelia Denmark and Etn Arkitekter ApS.
skala architecture has been responsible for the fire safety design, dialogue with fire authorities and DBI (Danish Institute of Fire and Security Technology) including fire testing, and holds the fire approval, which is project-specific for Sundby School.
Read more about the project here: https://lnkd.in/d5gT6xex
Photos: Rasmus Hjortshøj