Tree houses for schoolhouses.

Look what you can build in just six months with offsite-premanufactured mass timber! We talked to Karel Verzelen, the CEO of CLT-S, about St. Joseph's School in Ekeren, Belgium.

Can you tell us more about St. Joseph's School

St. Joseph's School is an existing school that needed to be relocated because of the infrastructure works around the ring of Antwerp, Belgium. The relocation needed to be executed very fast to not slow down these infrastructure works.

The plot was found very quickly in a residential neighbourhood in Ekeren. The new campus will house more than 400 students on a surface of about 20 000 m-2 and has all modern facilities to provide for an excellent education and environment for the students.

Why was St. Joseph's school built in wood

After the plot was decided upon, a competition was held to find the right architect and design for the school. Bovenbouw Architects won the competition and immediately understood that this was a unique opportunity and that the timing was very short. That's why they were looking to find a building concept that was very quick and reduced the time on site. Aside from the construction speed, sustainability was also a very important consideration. Prefabrication was a must, and since cross-laminated timber (CLT) is one of the most sustainable materials that can be prefabricated, the choice was easy to make.

St. Joseph's is built with offsite-manufactured building elements. Tell us more about working that way.

The conceptual design has been considered to work with as many prefabricated elements as possible. The general concept has been repeated throughout the building: glued laminated timber (GLT/glulam) columns and beams with CLT floors and walls.

The connection details were kept as simple as possible, and for aesthetic reasons, the architects didn't want to see any steel connection details or screws. Essentially, we created a kit for all typologies of rooms and spaces in the building.

How is it to work in this way Are there any specific challenges

Preparation is key. Since we are used to working with CLT, we already knew that the building must be completely modelled in 3D as it will be delivered and executed on-site exactly the way it is modelled. The BIM toolbox trajectory before the actual construction period is the biggest challenge. The MEP design needs to be integrated flawlessly with the structural model since there needed to be many cut-outs through the beams.

When you start a project like this, who decides that wood is the preferred material

The decision to use wood was made mainly for reasons of speed and sustainability. Another reason was the biophilic effect wood has on the students. The school board was quickly convinced. Compared to traditional construction materials wood is still a niche product, but in the current climate where sustainability is very important wood as a building product is gaining traction and market share.

After wood is chosen as the material, what is the process for ordering custom elements cut to size

Our company, CLT-S likes to be there from the beginning because then we can influence the design process to optimise the structure. This was a public tender, so we got involved a bit later.

Once CLT-S is on board, we immediately start working together with the contractor (Van Roey) to coordinate the design of the execution plans in BIM. The moment the production model is finished we send it to Stora Enso and a couple of weeks later the first truck arrives on site.

This project has only had 100 trailers. They were all delivered and assembled in a period of just six months for the entire structure. The production and assembly process has been tremendously quick.

About 20 000 m-2 in this short amount of time captures more than 4 500 tonnes of CO. The trees used for this project are grown back in less than one hour in the Austrian forests.

Building in wood is a trend that is here to stay, isn't it

Our entire business model is based on that belief, yes.

So, what do the students and teachers say about their new school

Everybody is very excited to move in beginning next year. The new school will uplift the neighbourhood and create a second home for all the kids. The school is designed with materials that are close to nature which results in a healthy environment where the future generation can blossom.

Thanks for taking the time to talk to us about building schools with wood. Before we leave, please can you tell us a bit about yourself and CLT-S.

My name is Karel Verzelen and I'm the CEO of CLT-S. CLT-S is a partner of Stora Enso for the market of The Netherlands and Belgium. At CLT-S we take care of the engineering, production design, logistics and assembly of CLT and other wood products. We were one of the first partners of Stora Enso and are proud of our experience and expertise as a subcontractor for all wooden structures.

This case study was prepared by Louisa Russell, Content Manager, Stora Enso Wood Products.

Part of the global bioeconomy, Stora Enso is a leading provider of renewable products in packaging, biomaterials, wooden construction and paper, and one of the largest private forest owners in the world. We believe that everything that is made from fossil-based materials today can be made from a tree tomorrow. Stora Enso has approximately 22,000 employees and our sales in 2021 were EUR 10.2 billion. Stora Enso shares are listed on Nasdaq Helsinki Oy (STEAV, STERV) and Nasdaq Stockholm AB (STE A, STE R). In addition, the shares are traded in the USA as ADRs.

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