DERIX Hollow box ceiling
Hollow box ceilings are bonded composite cross-sections. They consist of glulam ribs, which are aligned in the main span direction, and upper and lower panelling made of X-LAM. Thanks to the targeted bonding of the two timber materials, box girder ceilings from a span of approx. 6 m represent an effective and economical alternative to pure X-LAM constructions. The existing spaces between the ribs can be used as an installation level. In addition, the structural-physical properties of the ceiling system can be further optimised by inserting additional materials into the spaces between the ribs. Box girder ceilings are ideal for use in buildings in which large spans are to be realised that have to bear high loads.
Advantages of the hollow box ceiling at a glance:
- High performance: high load-bearing capacity with low weight; stiffening floor slabs are easy to realise
- High economic efficiency:
– Large spans with high loads
– Reduced deflection and minimised vibration behaviour thanks to high rigidity - Design flexibility: open and flexible floor plan design through reduction of load-bearing walls
- Reliability: standardised product defined by ETA
- Optimum accuracy of fit: high dimensional accuracy thanks to precise joinery
- Reduction in fasteners: fewer fasteners required due to stiffer bond and optimised component properties
- Attractive appearance: flat timber appearance
- Hollow box ceilings offer additional utilisation options: Insertion of additional materials for building physics optimisation
- Simplified planning: free pre-dimensioning tool X-LAM Designer as a service
Structure and dimensions
of the hollow box ceiling
In order to produce a DERIX box girder floor in accordance with the technical principles of the ETA, the following dimensions must be observed:
h ≤ 600 mm
d 60 – 180 mm
d 60 – 180 mm
h1 100 – 480 mm
t1 ≤ 120 mm
t1 ≤ 120 mm
b ≤ 3000 mm
t2 ≤ 120 mm
t2 ≤ 120 mm
b1 ≤ 600 mm
L ≤ 10 m
L ≤ 10 m
Planning aids for hollow box ceiling
With the DERIX X-LAM Designer, we provide you with a free dimensioning programme that you can use at any time to pre-dimension your ribbed or hollow-core box ceiling.
- Intuitive design software for use both in the course of preliminary design and for the creation of structural documents
- Individual configuration options for the arrangement of the plates, the cross-sections and the materiality of the ribs
- Consideration of the deformation components from shear deformation in addition to the deformation components from bending deformation
- Verification in the ultimate limit state and the serviceability limit state incl. vibrations
- Hot design in progress
Planning & statics
Which ceiling type
for my building project?
We have compiled and evaluated criteria for architects and planners in this comparison table. This will give you a quick insight into which type of ceiling can offer the greatest benefits for your building project.
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