CLIP SPORTS FLOOR
SPECIFIER'S AND INSTALLATION INSTRUCTIONS

 

D 2.1

 

D 2.1

 


CLIP SPORTS FLOOR SYSTEM

D 1.0 General information
D 2.1 Specifier's and Installation
instructions

Fig. 1

1. SYSTEM SPECIFICATION

Junckers Clip Sports Floor System is based on 22 mm solid hardwood floor boards installed as a floating floor with steel clips on a resilient foam underlay.

The floor system is categorized as an area elastic sports floor with medium shock absorbency and elasticity particularly suitable for fitness and aerobics as well as in refurbishment projects.

Total construction height: 32 mm.

The floor system is tested and approved according to the European Sport Norm EN 14904 class A3, when using 10 mm Junckers Sports foam.

Please note that full documentation of a this floor system comprises General information and Specifier's and Installation instructions, see Figure 1.


2. FLOOR COMPONENTS  - JUNCKERS CLIP SPORTS FLOOR SYSTEM

 

1 - Junckers 2-strip solid hardwood floor boards
Thickness x width x length
22 x 129 x 3700 mm

Wood Species, grade and surface:
See data sheet B 2.0

2 - Steel Clips

3 - Intermediate layer
10 mm Junckers SportsFoam

4 - Moisture barrier on concrete
0.20 mm PE membrane, Junckers
Moisture Barrier, 4 x 25 metre.

5 - Header joint adhesive
Junckers SylvaFix

6 - Junckers expansion strip
Height x width x length
12 x 12 x 1000 mm

7 - Expansion gap at the wall
2 mm per metre of floor width on each
side, min. 15 mm.

Is also required at fixed points, e.g.
columns.

Fig. 2


3. LOAD-BEARING STRENGTH OF THE SYSTEM

Load-bearing strength of the clip system depends on the type of load, see table 1.

See also data sheet D 1.0 - Stiffness and load-Bearing strength of floors.

TABLE 1 Loading types
Floor board thickness Area load
per m²
Area load
ø25 mm
Area load
100x100
Wheel
load
22 mm 800 kg 350 kg 400 kg Se D 1.0
Table 1

4. CHOICE OF SUB FLOOR

Subfloors must be self-supporting and can be made of concrete, lightweight concrete, screed or in connection with renovation be an existing sports floor with e.g. a synthetic or wooden floor surface.

The elasticity of the subfloor has a direct impact on the properties of the completed floor in terms of deflection, impact absorption and ball bounce.

In renovation projects the elasticity and load bearing strength of the existing floor must be assessed in relation to the use of the floor.

If the floor area is made of several types of subfloors, it must be of uniform elasticity and flatness, to ensure a uniform performance of the sports floor.


5. BEFORE BEGINNING TO INSTALL THE FLOOR

The building must be weather tight. The heating system must be installed and tested, and during the heating season there should be a constant heat supply.

Cast concrete elements, including casting of sockets for fixtures and fittings, screeding and other wet trades which can contribute moisture to the building, e.g. priming of paintwork, must also be completed.

The relative humidity in the building must be within the relative humidity interval expected, when the building is in use and the room temperature approx. 20°C.


Fig. 4

6. MOISTURE PROTECTION

Concrete subfloors
The residual moisture contained in the concrete or screed must not exceed 90% RH.
(UK: Concrete moisture max. 75% RH acc. to BS 8201, when checked by measurement).

At ground and upper levels protection against moisture both from within the building and from the ground is required.

A moisture barrier is established by laying a damp-proof membrane, 0.20 mm PE membrane or 1000 g polythene, e.g. Junckers Moisture Barrier, directly on the concrete, see Fig. 4.

Fig. 5

Wooden subfloors
The moisture content of a wooden subfloor must be in balance with the relative humidity of the room, i.e. moisture content of 6-12%.

For renovation projects where floating floor systems are laid on existing wooden subfloors, it must be ensured that the entire structure has been designed to the correct specifications regarding moisture.

Usually, no additional moisture protection is laid on top of an existing wooden floor as this may course the risk of fungal attacks in the sub construction, see Fig. 5.


Fig. 6

7. FLATNESS OF THE SUBFLOOR

Before intermediate layers are laid the subfloor must be levelled so that any deviations in the flatness do not conflict with the requirements of one of the two
methods stated below.

A) Traditional straight edge
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 mustbe corrected.

B) Straight edge with supports
The subfloor must be flat with a maximum deviation of ± 2 mm under a 2 m straight edge (2mm supports). The surface must be smooth. Any minor irregularities, e.g. across day joints, must be corrected so that the maximum localised deviation from flat level is ± 0.6 mm under a 0.25 m straight edge (0.6 mm supports).

Major irregularities on concrete floors can be corrected by using a selflevelling compound. Wooden subfloors may be levelled by sanding or installing hard fibreboards, possibly combined with filler, or by laying fibrous plasterboards.

Junckers Technical Information specifies the flat level requirements of subfloors as A maximum deviation of 2 mm under a 1.5 m straight edge.
(UK: 3 mm under a 2 m straight edge).


8. INTERMEDIA LAYER - SPORTSFOAM

As intermediate layer for a Junckers floating sports floor, use Junckers 10 mm Sports Foam.

For more information, see Junckers Sports Foam H 3.3.


9. EXPANSION STRIP AND ADHESIVE

Junckers expansion strip is mounted tautly between board ends and walls.

All board header joints are glued with Junckers SylvaFix, Header joint Adhesive.


10. CHOICE OF INSTALLATION CLIP

Installation Clips are available in different sizes according to various air humidity ranges.

The clip size is selected primarily on the basis of the expected maximum relative humidity (RH) in the building during the year.

However, in order to minimize the overall movements of larger floor areas, it may be necessary to choose a larger clip size than normally corresponding to the expected maximum RH. 

The general rule for sports floors is:

Floor
area

Clip size

Humidity
range %

Gaps at
installation
time

Label
colour/
Clip taging

< 500 m²

129.4 mm

35 - 65

Appr. 0.4 mm

Yellow
2-hole

> 500 m²

129.6 mm

35 - 65

Appr. 0.6 mm

Black
2 ½-hole

We ask you to contact Junckers for advice, if the expected humidity range does not match the interval 35 - 65 %.

We have clips matching any humidity range, see examples in table below.

Clip size

Humidity
range %

Gaps at
installation
time

Label
colour/
Clip taging

128.8 mm

10 - 40 **

Arctic/
desert areas*

White
0-holes

129.1 mm

25 - 55 **

Appr. 0.1 mm

Green
1-hole

129.8 mm 65 - 85 Appr. 0.8 mm Red
3-holes
130.2 mm 75 - 95 Appr. 1.2 mm Orange
4-holes

*Arctic/desert areas
The 128.8 mm clip is used in arctic and desert areas. Acclimating of the wood prior to installation is necessary.

** Humidity range from 10 - 55 %
In a very dry environment there will be some larger permanent gaps between the floorboards.

Specifiers are advised to contact Junckers Technical department if such conditions are anticipated.

Fluctuation in the relative humidity
With all clip sizes, gaps will appear when the relative humidity falls to, or below, the lower end of the recommended humidity range.


11. NET CONSUMPTION OF MATERIALS

Net consumption for a Clip Sports Floor System:

Floor boards: Area + approx. 2% wastage
Steel Clips: 17 pcs. per m²
2-way steel clip (Optionally): 3.3 pcs. per m²
Loose tongues of 600 mm (Optionally): 1 x the length of the sports hall
Junckers SportsFoam: Area + approx. 2% wastage
Junckers SylvaFix, Header joint Adhesive: 1 bottle per 75 m²
Junckers expansion strip: 2 x floor width
Moisture barrier, 0.2 mm PE membrane (always on concrete): Area + approx. 10% wastage incl. Overlaps


For halls with many columns, etc. extra clip consumption must be included in the estimated consumption.


HOW TO INSTALL THE FLOOR


1. WHEN TO START INSTALLATION

Solid hardwood floor boards should always be laid immediately after arrival at the building.

The plastic wrap must not be removed until installing of the floor begins.


2. MOISTURE BARRIER

A moisture barrier of min. 0.20 mm PE membrane is laid, e.g. Junckers Moisture Barrier.

The moisture barrier is laid with an overlap of 200 mm at all joints, continuing up walls, etc.

The polythene has to be taped at all lap joints using a tape 50 mm vide.


3. INTERMEDIATE LAYER - SPORTS FOAM

Junckers Sports Foam is laid at right angles to the laying direction of the floor boards with joints fully closed and taped in place.


4. CLIPS, EXPANSION STRIP AND ADHESIVE

Before starting to install the floor boards, make sure that the clip size corresponds to the expected relative humidity in the building during a full year.

With the underside of the floor board facing upwards the clip-end with hole(s) is knocked down into the clip groove, so that the free end of the clip points in the direction of the tongue, which is also the laying direction, see Fig. 6.1 & 6.2.

All floor board header joints are glued, see Fig. 6.3. Never apply adhesive to the longitudinal sides of the floor boards.

Junckers expansion strip (A) is mounted tautly Between floor board ends and walls, see Fig. 6.4.

Where the floor surface is broken by columns, etc. extra clips must be placed at a distance of 200 mm.


5. MOUNT THE CLIPS CORRECT

The first and last clips are placed maximum 80 mm from the board end adjoining the end wall.

The spacing of the clips on the outermost 3 rows of boards on each side must be 400 mm. In all other rows the spacing must be 500 mm.

Ensure that the clips do not touch each other by alternating them (in line) at approx. 50 mm intervals.

Make sure the free end of the clips is properly placed in the groove on the neighboring board.

Since this can be difficult due to the elasticity of the mat, use e.g. a small metal plate or the like as a load spread sheet. The metal plate is moved as work progresses.


6. DISTANCE TO WALLS AND FIXED INSTALLATIONS

The distance (A) between the floorboards and walls/vertical fixed installations is calculated as 2 mm per running metre of floor width on each side and for floors over 12 m wide a minimum 30 mm on both sides.


7. LAYING DIRECTION, PATTERN AND BOARD JOINTS

Lay the floor boards in an irregular pattern, spacing floor board joints as evenly as possible.

The distance (A) between floor board joints in two consecutive rows should be at least 450 mm, see Fig. 8.1.

Stave joints in one row may not adjoin stave joints in the adjacent row, but must be spread as widely as possible and minimum 50 mm.

Adjust the boards in the last row, and remember the correct expansion gap (B) to the wall, see Fig. 8.2.

The last row of floor boards is glued on the longitudinal side and laid against the floor boards in the previous row. Use a joint puller (C) to knock the last board into place, see Fig. 8.3. Remember to remove spacing blocks before skirting is mounted.

Only the boards in the last row may be glued on the longitudinal side.


8. BUSHINGS

When mounting of bushings in the floor the internal diameter of the bushing must exceed that of the pipe, i.e. the external diameter of the net pole, by at least 40mm.

At the outermost zones of the floor all bushings are mounted eccentrically towards the middle of the floor in relation to the sockets in the concrete, see drawing.

Floor rosettes must be mounted to allow both vertical and horizontal movement of the floor to take place unimpeded.

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