Hotel restaurant de KASerne

Location Willemspoort 1, 5223 ’s-Hertogenbosch Netherlands
Building Year 2017
Architect DAT
Structural Design FraSp Bouwadvies Constructies
Constructor D.Hobo & Zn. Bouwwerken BV.
Customer Hotel restaurant de KASerne
Products Used Kerto LVL

Event space in a conservatory – giving old barracks an inviting look with LVL and glass

​Hotel restaurant de KASerne’s conservatory acts as a setting for meetings, conventions and exhibitions. The cosy building stands on a three-pin frame made of Kerto® LVL (laminated veneer lumber). The frame was erected quickly thanks to light and prefabricated parts.

The robust, former barracks of the Dutch army have been given a full make-over and now the complex houses an inviting hotel-restaurant. The De KASerne site includes a unique conservatory-styled building of 380 m2. The beautiful construction is part of a municipal development project being carried out in ’s-Hertogenbosch, a city in the Netherlands.

When you look closer at the conservatory, your eye catches the interplay between wood and glass. Chris van den Heuvel, General Manager of Hotel Restaurant de KASerne, explains that the idea was to create a transparent space for meetings, conventions and exhibitions.

At the heart of the conservatory is a rigid and slender three-pin frame made from Kerto® LVL, topped with a glass sheath.  In 2019, the roof was shortlisted for the title ‘Roof of the Year’ by Steildak Magazine, a Dutch magazine specialising in roof construction.

“Glass turns the conservatory into an open space, which blends nicely with its environment, and wood adds warmth and cosiness to the atmosphere. The use of Kerto® LVL also makes the building more sustainable,” says van den Heuvel.

Values guide Metsä Group's operations 
 

The planning, production and construction went smoothly thanks to the experienced conservatory constructor D. Hobo & Zn. Bouwwerken BV. Derk Hobo, director of the project, says that the key idea was to design and build as minimalistically as possible. The efficiency of construction was also important, and every part made of LVL, glass, aluminium and steel was prefabricated.

“You do not want to saw and hammer on-site, but to build as efficiently as possible. We just combined the Kerto® LVL panels and beams with metal plates on site and lifted them up one by one,” says Hobo about the faster and less expensive erection made possible by the use of Kerto® LVL products compared to traditional on-site construction.

After the frame had been levelled, the glass roof and walls were built, also piece by piece. The assembly was precise as Kerto® LVL is a dimensionally stable material.

Load bearing structure

Three-pin frame with Kerto® LVL

The hotel restaurant de KASerne’s conservatory is 29.5 metres long and 14.0 metres wide with a 7.6 metre tall roof ridge. The building is supported by a three-pin frame made of Kerto® LVL Q-panels and S-beams. Use of Kerto® LVL as a building material makes construction fast, light and green.

“The snow and wind loads added to the weight of the roofing are transferred from the roof plates to the top chords and from there to the columns. Then from these LVL panels they are transferred to the steel parts and from those, finally, to the concrete slab foundation,” says Frans Spermon, Main Engineer at FraSp bouwadvies constructies.

The three-pin frame benefits from Kerto® LVL Q-panels’ shear strength, which results in strong angle connections. As the roof is asymmetrical, different sizes of panels were used. The stiff Kerto® LVL S-beams allow the needed long spans. The glass roof made of hardened and layered glass adds up with high storm and hail resistance.

The higher stiffness of Kerto® LVL S-beams allows for longer spans with minimal deflection.

The three-pin frame is made of Kerto® LVL Q-panels and S-beams. All parts were prefabricated.

Galvanised steel foundation

​Galvanised steel foundation and bolts support the timber frame and were used for the levelling and straightening of the structure.

Steel supports

​Steel supports are in place for extra stability of the beams.

Steel plates

​Moderately sized steel plates were used as the cross-bonded Kerto® LVL Q-panels provide strength in steel-to-wood connections.

Bracing

Stability with ‘Willems Ankers’ bracing system

To ensure the stability of the conservatory, wind bracing in the rear facade and roof was done with a ‘Willems Ankers’ bracing system, which is a Dutch solution. The Willems Ankers system consists of round steel parts and two forks at the ends.

“These bracing products look very elegant and slim compared to large bracing plates, and by using them we got the industrial look we were looking for,” says Hobo.

Because of the stiffness of Kerto® LVL frame, bracing was only needed lengthwise.

Connections

Values guide Metsä Group's operations 
 

High connection strength, smaller plates

Galvanized steel bolts are typical both at the foundation and on top of the roof ridge in wood-to-wood connections.

“The use of Kerto® LVL made connections easier than I originally thought. We were able to use moderately sized steel plates instead of big ones in the corners thanks to the high connection strength of cross-bonded Kerto® LVL Q-panels. This created both savings and a visually more attractive solution,” says Spermon.

Steel plates can also be found in the roof ridge, where the two rafters meet.

Fire safety

Coating to ensure fire safety

As LVL is a key material in Hotel Restaurant de KASerne’s conservatory, local and national fire safety requirements were strict. Hobo turned to a project partner, who owns a coating factory.

“LVL parts were coated twice. The first coat helps LVL to sustain the original colour, and the second one is the fire-coating to extra-certify the fire-safety,” says Hobo.

Values guide Metsä Group's operations 
 

Loved by customers

The conservatory has also been tested as a summer terrace, and one side of it can be fully opened. The guests simply love the place.

“The first impression is pure amazement. Then the guests immediately start to visualize their own events taking place here,” says van den Heuvel.

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