best wood CLT BOX – CEILING open Open wooden box element for easy installation routing

best wood CLT BOX is a statically effective and at the same time space-creating wood element, which is suitable for all ceiling requirements thanks to its versatile dimensions and excellent construction characteristics. A high-performance and versatile building product is created by utilising the advantages of solid timber and wood frame construction.

The combination of CLT and ribbing planks produces a high static load-bearing capacity with a comparatively low weight. The crosswise assembly from high-quality raw material in combination with high-quality gluing of edges and surfaces guarantees a high degree of dimensional stability. A high degree of prefabrication of the best wood CLT BOX with downstream cut-off and the simplicity of joining the best wood CLT BOX elements ensures swift and cheap installation and guarantees dry construction. It is simple to produce building element constructions with increased fire resistance with evidence from the best wood STATICS software.


  • high static load-bearing capacity and comparatively light weight
  • high degree of prefabrication and simple joining of the ceiling elements for swift and cheap installation
  • utilises advantages of solid timber and wood frame construction
  • self-completion possible
  • for inserting installations in the longitudinal direction
  • C24, GL 24h

    Strength class

Fields of application

  • Ceiling
  • Roof

Delivery formats

  • Type of wood & Quality

    • local spruce, industrial quality
    • scandinavian spruce, visual quality
    • local spruce, premium quality
Width (mm)
900 to 1200
Thickness (mm)
Length 2.30–16.00 m, from 440 mm total height 8.00–16.00 m
Width 900–1200 mm
Number of ribs 3
Lower CLT panel in 90 mm with increased fire protection requirements
Minimum production length per element width 8.00 m, chamfered on one side (only when open at the top)

Filling wood

  • filling wood can be glued on in the factory
  • for passing through vertical loads

Technical data

Strength classBoard C24; rib GL 24h
Application classesUse in application classes 1 and 2 according to EN 1995-1-1
DryingKiln dried, wood moisture max. 15 % at delivery
BondingClear, water-proof gluing with polyurethane adhesives (free of formaldehyde)
LamellaeBoard: 20, 30 mm; rib 40 mm
General informationPlaned on four sides, bottom side chamfered 4 mm (measured diagonally)
Emission classE1 according to DIN EN 717-1
Reaction to fireD-s2, d0 according to DIN EN 13501-1
FireproofingVerification possible via the free best wood STATICS software
AirtightnessAirtight after testing in accordance with EN 12114 from 60 mm


For your and our safety, we take great care to ensure a high standard of quality.

best wood CLT BOX - THE solution for multi-storey timber construction


Here you will find popular accessories for this product.

best wood CHIPPINGS

best wood CHIPPINGS

Used for putting into the best wood CLT BOX – CEILING FS and as ballast in best wood ceiling elements.

best wood HONEYCOMB 30/60

best wood HONEYCOMB 30/60

Honeycomb board made from cardboard which prevents movement and sliding of the best wood CHIPPINGS.



PUR sealing tape for fire protection for the element joints with CLT BOX – CEILING.

Suitable accessories

Find everything that is right and good for working and processing our timber products.

Reference Residential extension: studio building A place made of wood for creative development and versatile use of open CLT BOX elements

More space for creative processes and harmonious living: Here, traditional craftsmanship is skilfully combined with modern building techniques. An impressive symbol of contemporary building in harmony with nature.

  • Location 4714 Aedermannsdorf, Switzerland
  • Building type Residential buildings
  • Building measure New buildings, Extension