Assembly instructions OSB board

TRANSPORT
SWISS KRONO OSB/3 should be transported and stored with appropriate care in order to avoid damage.

PALLET STORAGE IN A WAREHOUSEE
SWISS KRONO OSB/3 should preferably be stored in a closed and ventilated warehouse. Boards can also be stored under a canopy roof to avoid exposure to precipitation.

BOARD STORAGE ON A CONSTRUCTION SITE
If it is not possible to store the boards under a roof, a section of even ground should be provided, e.g. a platform. Boards should be isolated from the ground with a layer of plastic film. Pallets should be protected with plastic film, a canvas cover or another waterproof material with a free access of air. Appropriate protection of board pallets is shown in the following figures:

Before being used on the construction site, boards should be stored in new conditions for 24 h. According to rules governing the protection of wood-based materials, board humidity should not exceed 15% during assembly. At this humidity level, there is no risk of fungal or mould growth. SWISS KRONO OSB/3 must be carefully protected against direct contact with water, both during storage and construction works. Immediately after outdoor assembly (on the outside walls and roof), boards should be protected with a proper insulation against adverse effects of weather. If SWISS KRONO OSB/3 are exposed to moisture for an extended period, their edges may slightly swell. The swelling, according to the applicable standard, can be up to 15% for SWISS KRONO OSB/3. In some cases, it may be necessary to grind the edges to obtain an even plane before laying finishing elements, such as bituminous tiles on the roof. Each SWISS KRONO OSB/3 panel has an identification overprint. During assembly, straight edge boards should be placed in such a way (with the overprint facing up or down) as to be able to identify the board in the future. From the structural point of view, it does not matter whether SWISS KRONO OSB/3 is placed with the overprint facing up or down. Boards with tongue-and-groove moulded edges have their left and right sides. The right side is the one creating a smooth and even surface after assembly. The left side has a small compensation gap where panels are joined, and an identification overprint on the board surface. 
If SWISS KRONO OSB/3 is laid in a band longer than 12 m, a compensation gap of at least 25 mm should be left.

FLOOR

Boards with straight edges should be joined on joists providing at least 3 mm dilatation around the board. The tongue and groove structure has a dilatation gap automatically. A 12 mm dilatation gap between floor boards and walls should be kept when the boards are used to make a floating floor. Boards should be placed with their main axis located perpendicularly to joists, while shorter board edges must always be connected on joists. Longer board edges lying beyond joists must be tongue-and-groove moulded and have a proper support or connector. When working on ceiling with no roof, drainage holes should be made to drain water during precipitation conditions. 
For wooden ceilings of the ground floor adjoining the ground, suitable wind-insulation should be used underneath the ceiling, with additional vapour-insulation directly on the ground. 
SWISS KRONO OSB/3 used for flooring purposes should be fixed with wood screws, or ring or spiral nails, with the length corresponding to at least 2.5 x panel thickness.

Note

Black drywall screws are not suitable for wood-based board as they have different hardening parameters. 
Nails should be driven every 30 cm on intermediate supports and every 15 cm on board joints. In order to increase floor rigidity, boards can be glued to joists with a solvent-based glue. Tongue-and-groove joints should be glued e.g. with D3-type adhesive, in the case of floating floors, maintaining a dilatation gap of at least 1 cm between the floor and wall.