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Skellet as element


Modular steel construction system

Skellet as element

Detail of a Skellet joint

A skellet construction

1. Round tubes are structural the most efficient, but hard to connect.
2. Square profiles with second best structural properties are better, but the downside is that the thickening of the connectors gets in the way.
3. The cross-box Skellet profile combines the strenght of the square tube with space for all kinds of connecting pieces.

3rd reassembly of a Skellet system in GTB Lab Module


Skellet can be dismantled down to the smallest component. Both the profiles and the connectors can then be reused in any project. The reusability also means that the profiles and connectors retain a higher residual value.


Skellet is a construction system that can be used in a variety of applications. The system consists of two steel profiles and a range of connectors. The Skellet profile is a cross-box steel profile with recessed surfaces in which holes are punched every 25 mm. These holes create a grid that ensures a stable construction. Each connector is designed with the same holes and can therefore always be connected to the grid, which makes building with Skellet very accessible to any (do-it-yourself) builder. This hole pattern ensures dimensional consistency and flexibility, a key requirement for circular design.

The Skellet construction system consists only of bolted and riveted joints. These can be loosened without damaging the profile or the connectors. These profiles can then be perfectly reused in another project.





Manufacturing location

Kompellaan 11, Genk, Belgium

Industry consortium




Height (or depth):




3 6250 mm

100 mm

100 mm

2 mm

Hazardous materials



2019 - produced and assembled in Ridderkerk NL
2021 - reused in GTB Lab, Heerlen NL

Circularity data

Reversible BIM: the 3D color-coded model visualizes the reuse potential per element.
RP Product legend.png

Embodied mass:

Embodied carbon:

22,68 kg

35,15 kg CO2

Reuse Potential:

Recovery option


Reuse by minor repair

Reused mass:

Reused carbon:

15,87 kg

24,61 ton CO2

No. of elements:

No. of disassembly steps:



Remaining Technical Life Cycle:

95 year

gtb lab phase 1 - circularity profile tonnage.jpg

gtb lab phase 1 - circularity profile tonnage.jpg

gtb lab phase 1 - tonnage recovery option.jpg
gtb lab phase 1 - carbon recovery option.jpg
gtb lab phase 1 - tonnage avoided waste.jpg
gtb lab phase 1 - carbon avoided waste.jpg
gtb lab phase 1 - tonnage material distr.jpg
gtb lab phase 1 - carbon material distr.jpg
gtb lab phase 1 - tonnage overview materials.jpg
gtb lab phase 1 - carbon overview materials.jpg

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Skellet as element

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