Junckers Portable A4 Sports Floor System

C 9.1


C 9.1


Fig. 1

D 1.0 General information

D 1.1 Clip Sports Information

D 9.1 Specifier's Information

D 9.1.1 Laying Instruction


Junckers A4 Portable Floor System is based on 22 mm solid boards, prefabricated into panels/elements with prefixed battens and shock pads. The floor system is an area elastic type of sports floor with high shock absorbency and elasticity suitable for ball games, fitness and aerobics as well as a temporarily sports floor, e.g. with special line markings for a given sports game.

The construction height is 40 mm.

The floor system fully conforms to EN 14904:A4.

Please note that full documentation of a floor system comprises the data in D 1.0, D 1.1, D 9.1 and D 9.1.1, see Fig. 1


The Portable A4 Sports Floor System is installed as a floating floor on a dry, load-bearing floor of concrete, lightweight concrete or wooden materials, e.g. an existing sports floor.

The subfloor must be flat with a maximum deviation of 2 mm under a 1.5 m straight edge (UK: 3 mm under a 2 m straight edge). The surface must be smooth. Any minor irregularities must be corrected.


The elements are laid in an interlocking pattern so that all joints are staggered 900 mm from row to row. The elements are locked together with pre mounted assembling fittings. Lengthwise the elements have a tongue and groove connection and at ends the elements are joined using loose tongues.

NB: Centre Row elements are available on request with this system. Centre Row elements comes with assembly frames on each side of the elements, and are laid out in the middle/centre of the floor as a starting row. 


2 mm per metre of floor width on each side, min. 30 mm. Is also required at fixed points, e.g. columns.


On ground floors and where there is a risk of moisture penetration a moisture barrier of 0.20 mm PE membrane, e.g. Junckers Moisture Barrier, is laid directly on the concrete. 


The Portable A4 Sports Floor System is tested and approved for below mentioned maximum point loads, in relation to load area:

Diameter, 25 mm: 3.5 kN (=350 kg) 100x100 mm: 5.0 kN (=500 kg)

file_Fig. 4


The load-bearing strength of the system depends on the load, load area and subfloor type. The floor's total transverse expansion can also play a role, depending on the climate conditions in the hall. Table 1 shows use of the floor system in relation to the load classes in EN 1991-1-1. See Fig. 4 for specifik point load bearing strength.

For further definition of load classes and types, see D 1.0 - Stiffness and loadbearing strength.

  Loading types
Loading category Area- and Point load Wheel load
C4: Assembly halls for physical activity, e.g. gyms/theatres Approved* Approved**
C5: Assembly halls which can be crowded, e.g. sports halls incl. stands Approved Approved**

* Point load area min. 200 x 200 mm

** Wheel loads, see D 1.0 - Table 2


1 - Floor Elements
• Junckers 22 mm solid boards for sport.

Wood species and grades: Beech Premium and Maple Champion, lacquered.

Element width x length:
1/1 element: 513 x 1800mm
1/2 element: 513 x 900 mm

2 - Fittings
• Pre mounted assembling fittings.

3 - Prefixed battens
• Veneered battens with shock pads. Total batten height of 18 mm.

4 - Skirting (accessories)
• Perimeter ramp made as corner profiles and profiles in 2 meter lengths in metal.

5 - Moisture barrier on concrete
• Min. 0.20 mm PE membrane, e.g. Junckers Moisture Barrier. 

file_Fig. 2


Net consumption for a basketball court according to the official FIBA rules 19 x 32 metres (incl. a 2 metres safety zone around the court):

1/1 Elements: 665
1/2 Elements: 38
Loose tongues: 717 pcs.
Resilient mat: 632 m²
Optional moisture barrier: 700 m² incl. overlaps

NB: The actual area of floor will due to the floor elements size in most cases be slightly bigger than the calculations figures


Transport trolley: Designed to load 40 pcs. of 1/1 elements
Perimeter trims: Metal ramp as finish of the floor
Removal hook: For removal of loose tongues when dismantling the elements
Loose tongues: Supplied in plastic

See also H 5.0