SOLID HARDWOOD FLOORING
JUNCKERS NEW ERA UNOBAT FLOOR SYSTEM
JUNCKERS NEW ERA UNOBAT SPORTS FLOOR SYSTEM
|D 1.0||General information|
|D 1.2||Batten System Information|
|D 10.2||Specifier's Information|
|D 10.2.1||Laying Instructions|
BEFORE LAYING 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 between 35 - 65% RH (UK) and the
temperature approx. 16-20°C. The residual moisture contained in the concrete or screed
must not exceed 90% RH. (UK 75% acc. To BS 8201). For timber subfloors the moisture
content should not exceed 12%.
Solid boards should always be laid immediately after delivery.
The packing on the bundles must not be removed until just prior to laying the floor, i.e.
no acclimatising of the boards on site must take place.
NB: Read these instructions carefully before laying begins. In case of doubt
please contact your Junckers distributor before installing the floor.
1. A moisture barrier of min. 0.20 mm PE membrane must be laid on all concrete
The moisture barrier is laid with an overlap of 200 mm at all joints, continuing up walls,
The membrane must be taped with waterproof tape at all joints.
LAYING OF SUBSTRUCTURE - BATTEN DISTANCE 411 MM
2. The battens and cradles are laid parallel to the shortest side of the room to ensure
that the boards are laid parallel to the longest side of the room. The first row of cradles
is placed at 100 mm from the wall to the centre of the cradle. The second row is laid at
341 mm to the first row. All other rows are spaced at 411mm apart from the last row
which is again spaced at 100 mm centre from the wall. At the end of each batten row
the end of the cradle should be placed 30mm from the wall.
Batten ends within the floor must finish in the centre of a cradle. The exception is the
first and last cradle of every row where the batten end is at the end of the cradle.
The second row of battens spaced at 341mm centres is based on an expansion gap of
30mm being left at the perimeter, which is the requirement for a 33 x 18m sports hall.
For smaller or larger floors please consult Junckers Ltd. for advice
3. Batten end joints must not be in line but must be staggered as much as possible.
When using the 36 x 45mm batten the cradles are spaced at 450 mm along the batten, when using the 48 x 45mm batten the cradles are spaced at 600 mm centres and when using the 63 x 45mm batten the cradles are spaced at 700 mm.
The entire substructure must be placed with an expansion gap of minimum 30 mm from
all walls, net posts, pipes, etc.
4. The first 3 rows of cradles should be set out at the correct spacing and then laser
levelled into place using packing pieces which are placed into the top of the cradles.
Battens can then be placed in cradles.
The maximum permitted amount of packing per cradle is 15 mm before the
next size cradle is required.
Please note if using the wooden packing pieces, these must be glued to the
cradle, to one another and then glued to the underside of the batten. The
polypropylene packing pieces do not require gluing as they lock into place,
except for the top packer which must be glued to the batten.
5. Remaining batten rows across the floor are spaced at 411 mm.
Regular levelled Datum rows should now be set out maintaining the 411 mm batten
centres. The distance of the datum rows will be dependant on the length of the straight
edge used to span.
With the datum rows now in place the floor areas are effectively divided into bays and
the floor is ready for the positioning and levelling of the remaining cradles to fill the
NB. The last row of cradles are spaced 100mm from the wall to the centre of
It is recommended that the foam pads are removed from cradles positioned in doorways
and beneath fixed stationary objects to avoid deflection in these areas. This recommendation will also apply where floor heating grills have to be accommodated.
6. Place extra support battens (New Era UnoBat) at post-sockets, pipes etc.
The distance to walls net posts and pipes should be a minimum 30 mm.
NB: If the floor is used as a squash court, permanent spacing blocks at 500 mm centres
must be fitted into cradles and fixed as packing blocks between the first row of battens
and the front row of the court.
LAYING OF BOARDS
7. If the floor is more than 12 m wide laying must begin in the middle of the sports hall.
The two centre boards are joined with a loose tongue which is glued to both boards
down the full length of the hall.
The boards are secret nailed, see part 10.
8. In order to allow the floorboards to undergo expansion due to natural humidity
changes in the building, the boards must be laid according to the 10-board rule which
indicates the width of 10 boards when laid. Compliance must be checked periodically
during the installation process.
The 10-board rule is chosen on the basis of the maximum expected relative humidity of
the building during the year. eg. an expected relative humidity of max 65% RH normally
gives a 10-board measurement of approx 1294 mm.
The 10-board measurement is achieved by placing plastic spacers between every row of
boards during installation. Spacers are available from your Junckers distributor.
If in doubt please contact Junckers Technical Department.
9. All board header joints must be fully supported by battens and all boards must be laid
in the pattern shown in the drawing.
NB: with a batten distance 411.1 mm, the distance between board header joints in two
consecutive rows must be 2 x 411.1 mm = 822.2 mm, as shown in the drawing.
10. To avoid creaking, the boards are pushed down on the battens while they are nailed.
Use Junckers machine J-nails, 2.2 x 45 mm or 50 mm Porta nails with pneumatic nail gun. The boards are secret nailed at an angle of 45°.
Do not nail closer than 50 mm to stave joints and never in the board end joints.
NB: The first and last rows of boards installed must be face nailed or screwed and then
covered with matching filler.
11. The distance between the floorboards and walls/vertical fixed installations is
calculated as 1.5 mm per running metre of floor width on each side, and at end walls 1
mm per running metre of floor length, with an overall distance of minimum 15 mm.
Bushings must be fitted so that both vertical and horizontal movement of the floor is
unimpeded. The size of the internal opening of the bushing must exceed that of the post
by minimum 40 mm. At the outermost edges of the floor all bushings are mounted
eccentrically towards the centre of the floor in relation to the post-sockets in the
concrete, so that the floor can expand freely.
Place extra support battens at net poles, pipes, etc
JUNCKERS SPORTS HALL SKIRTING
12. The foot of the skirting must lie flat and be in contact with the floor. End joints may
be either butt jointed together or 45º mitre the joints between sections to enhance the
visual effect of the joint.
The skirting can be either glue fixed to the walls or screw fixed with cups and screws.
Do not fix the skirting to the Junckers floor and ensure that the skirting is not exerting
any downward pressure on the floor.