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Based in Boxtel, Celdex has been serving construction and industry for over 40 years with a diverse range of plastic foam sealing products. Solutions that can be fully prefabricated by end users in a carefully conditioned environment. A trump card that the company is playing once again during the construction of Wisperweide, a new integral child center (IKC) in Weesp that is being realized with a brand new modular building system. With the Seal4Prefab sealing system, Celdex provides a suitable seal against driving rain on the outside in combination with an air seal on the inside.
The construction of Wisperweide, which began in early 2025, is a sterling collaboration between Aannemingsmaatschappij Friso, Houkesloot Toelevering and Celdex. As main contractor, Friso is realizing the project with the sustainable Schools by Circlewood system, which is based on the Wood Core Building Method (HKB). For this, Houkesloot is supplying the façade elements for the school building. “We will make sure that the horizontal and vertical seams between the façade elements are sealed both impact rain and airtight,” says Jos ten Brincke, Sales Manager Construction & Industry within Celdex.
“This is done with Seal4Prefab, a sealing system specifically designed to prefabricate façade elements with a driving rain seal on the outside and an air seal on the inside. This through quality products that have all been independently tested for wind and driving rain tightness.”
Sustainability and future-proofing are the keywords of the project, it turns out. In terms of materials used, but also when it comes to the building construction. “The basis of the HKB method are stackable wooden modules,” Ten Brincke teaches. “The innovation of this system lies mainly in the substantial savings on CO2 and nitrogen emissions and the detachability. When you eventually want to switch to another building function and/or a smaller surface area, here or at another location, all the elements can be quickly and easily disassembled and redeployed for other uses. That's the big plus.‘
For loosenability, it was therefore crucial that all seals be, dry joints. Hence, Houkesloot therefore chose the Seal4Prefab sealing system. To come up with a construction solution that would also be usable in the world of tomorrow, the parties decided to engage in detailed discussions early on. This paid off handsomely, according to Ten Brincke. “Because Houkesloot and Celdex each flew in specific expertise from their own fields, the end result meets the needs in all respects. From Celdex, we were particularly involved in thinking about the detailing of the elements, so that our sealing products could be applied to them intelligently and effectively and their qualities maximized.”
IKC Wisperweide (completion in late 2025) is the first school to be built on behalf of Innovation Partnership School Buildings Amsterdam. Over the next 10 years, another nine to thirty new school buildings will rise within this program. In what capacity or form is still uncertain. Fact is, however, that Friso, Houkesloot and Celdex have made a fine showcase with Wisperweide. “Of course sustainability is central,” Ten Brincke said. “But this way of prefabricating all sealing products offers so many more advantages. For example, you no longer need scaffolding; you simply hoist the complete elements up with a crane. This saves manpower and space on the construction site, time and failure costs. Furthermore, everything is much more controllable and comfortable because all sealing work takes place in the workshop. In all this, Celdex keeps its finger firmly on the pulse via intensive supervision and a special recording program. We leave nothing to chance.”
