Assembly instructions

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 compensation around the board. The tongue and groove structure has a compensation gap automatically. A 12 mm compensation 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 compensation gap of at least 1 cm between the floor and wall.

Table listing estimated relations between joist spacing and board thickness in construction applications:

  Spacing between joists [mm]

 400

 500

 600

  Suggested thickness of OSB [mm]

 15-18

 18-22

 22

WALL

SWISS KRONO OSB/3 can be installed on walls either horizontally or vertically. Compensation gaps of at least 3 mm must be maintained between boards and around door and window openings. The recommended board thickness for frame-type house walls 12 mm for the post spacing of 400 and 600 mm. 
SWISS KRONO OSB/3 panels used for wall applications 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. 
Nails should be driven every 30 cm on intermediate supports and every 15 cm on board joints. At external wall edges, nails should be driven every 10 cm. The distance between the nail and the board edge must not be smaller than 1 cm

 

ROOF

Before installing the roof sheathing, it should be checked whether rafters or trusses are straight, even and arranged along one axis. Bent or uneven rafter affect the final roof appearance. Boards which are wet due to rain should be immediately dried and protected against biological corrosion before laying roofing tiles, metal sheet, thermo-weldable roofing paper or shingles. Unheated sub-floor spaces or attics should be well ventilated. Ventilation openings should make up at least 1/150 of the surface plan of ventilated space. 
 Shorter board edges must always rest on roof supports. Longer board edges must be supported or joined with H sections, as required. A compensation gap of at least 3 mm should be kept between boards with straight edges. Board should be laid on at least two supports, with joints resting on the support. When fixing the boards, workers should stay on the rafter or truss, in compliance with OHS regulations in place.

 

If there are chimney openings in the roof structure, sheathing should be spaced from the chimney according to applicable Construction Law regulations. 
All applicable OHS regulations regarding works performed at heights must be followed during assembly works on the roof.
SWISS KRONO OSB/3 used for roofing 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. 
Nails should be driven every 30 cm on rafters or trusses, and every 15 cm on board joints. The distance between the nail and the board edge should not be smaller than 1 cm.

Table listing estimated relations between rafter or truss spacing and board thickness for roofs with a slope exceeding 14:

  Spacing between rafters or trusses [mm]

 600

 800

 1000

 Suggested thickness of OSB [mm]

 12

 15

 18

Impregnation and board's protection

It is only a temporary solution. SWISS KRONO OSB/3 should be protected against influences of weather conditions as soon as possible in order to prevent the moisture of the board to exceed 15%.

Performance technology:

  • SWISS KRONO OSB/3 does not have to be polished.
  • Impregnates are made on the basis of mineral and synthetic oils. Impregnates are thin, easily absorbed and protect Kronopol OSB/3 against moisture and biological corrosion.
  • Impregnate should be spread with brush or roller, minimum 2 or 3 layers depending on the appearance and requirements. Samples materials: (It is not recommended to use impregnates made on the basis of salt, because salt stops moisture in wall’s chambers and causes corrosion of metal elements.

 

Ceramic tile and parquet laying on OSB using adhesives

In order to ensure long and faultless service of floors covered with ceramic tiles, they must be made rigid. The use of thicker boards as a sub-floor or a bottom layer, together with the reduced spacing of supports, improves floor operation. Recommended board thickness: 25 mm. Boards should be fixed to supports using assembly adhesive.

No walking on newly laid tiled is allowed until the adhesive is dry to prevent breaking.

Use of flexible cement-based adhesive:

  • he adhesive makes it possible to fix ceramic and stoneware tiles directly to SWISS KRONO OSB.

Procedure:

  • Sand the board surface with sandpaper (grade 40-60).
  • Cut a grid with the mesh size of 5 cm and the maximum cutting depth of 1 mm all over the board surface.
  • Coat the board with acrylic primer. The primer is water-based, as a result of which wood fibres “rise”, increasing surface adherence.
  • In high-humidity areas, insulate the board with liquid film, with a wall overlap of ca. 30 cm.
  • Use a highly flexible adhesive.
  • After laying tiles, fill 4 mm voids around them with flexible grout.
  • Tiles with a smooth rear surface, measuring 20 x 20 cm as a maximum, are recommended.

Use of dispersion adhesives or two-component epoxy adhesives:

  • The adhesive makes it possible to fix ceramic and stoneware tiles directly to SWISS KRONO OSB/3.

Procedure:

  • Sand the board surface with sandpaper (grade 40-60).
  • Use a flexible dispersion adhesive or a two-component epoxy adhesive.
  • After laying tiles, fill 4 mm voids around them with flexible grout. The technology is also suitable for PVC tiles.

Parquet laying on SWISS KRONO OSB/3 using adhesives

Use of dispersion adhesives or two-component epoxy adhesives. The solution makes it possible to fix parquet strips and mosaics directly to SWISS KRONO OSB/3.

Procedure:

  • Sand the board surface with sandpaper (grade 60-80).
  • Use a flexible dispersion adhesive or a two-component epoxy adhesive.
  • Do not use bituminous adhesives!

 

Sample elevations and plaster coating on OSB

Wall cross-sections

Elevation made of cement board

1. Elevation made of cement board
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB 3 (full prefabrication)
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Wind insulation
8. Spacing batten made of SWISS KRONO OSB/3
9. Ventilation space
10. Cement board with mineral plaster

Elevation brick

1. Gypsum plasterboard or Fermacell
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB/3
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Wind insulation
8. Ventilation space
9. Anchor
10. Elevation brick

Elevation with thermal insulation (mineral wool) and mineral plaster

1. Gypsum plasterboard or Fermacell
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB/3
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Mineral wool
9. Thin-layer frost-resistant mineral plaster system

Vinyl sidin

1. Gypsum plasterboard or Fermacell
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB/3
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Wind insulation
8. Vinyl siding

 Elevation with mineral plaster on diamond mesh lath

1. Gypsum plasterboard or Fermacell
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB/3
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Bituminised cardboard
 8. Diamond mesh lath
9. Thin-layer frost-resistant mineral plaster system

Elevation with wooden siding

1. Gypsum plasterboard or Fermacell
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB/3
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Wind insulation
8. Ventilation space
9. Spacing batten
10. Elevation made of wooden planks

Plaster coating on SWISS KRONO OSB/3

The solution makes it possible to apply plaster to buildings with sheathing made of SWISS KRONO OSB/3.

Procedure:

  • SWISS KRONO OSB/3 must be installed according to assembly instruction. Use straight-edge board, keeping a ca. 3 mm compensation gap around the board.
  • Attach bituminous cardboard to the board surface by means of staples.
  • Attach steel diamond mesh lath as the main carrying frame under plaster layers (20 connectors per m2).
  • Apply thin-layer adhesive from the thermal insulation system (see affiliated companies). Apply thin mineral or silicate plaster (not the acrylic type) to the wall thus prepared as a component of the complex thermal insulation system

Elevation with mineral plaster on diamond mesh lath

1. Gypsum plasterboard or Fermacell
2. Vapour retarder (vapour barrier)
3. SWISS KRONO OSB/3 
4. Wall structure
5. Rockwool
6. SWISS KRONO OSB/3
7. Bituminised cardboard
8. Diamond mesh lath
9. Thin-layer frost-resistant mineral plaster system

Floor levelling system

Ceiling's acoustics