The Board with Built-in Fire Protection

The latest KRONOPLY OSB innovation is the fire-retardant, officially approved product KRONOPLY OSB SF-B, which has been tested by an accredited institute in Germany and assigned to reaction to fire performance Euroclass B-s2, d0 for fire-retardant building materials.

Feel-Good Safety

With the new KRONOPLY OSB SF-B, the SWISS KRONO GROUP has once again demonstrated its forward-looking, innovative expertise in wood-based materials. Like for all KRONOPLY OSB products, only fresh thinnings from sustainably managed forests are used to produced this innovative new flame-resistant board. And the use of completely formaldehyde-free binders makes sure that safety, natural raw materials and wellbeing come together.

Official Approved Safety

Germany’s Deutsche Institut für Bautechnik (DIBt) has extended its general approval (abZ) for building products and methods to the new fire-retardant KRONOPLY OSB SF-B, square-edge. The approval number is Z-56.275-3563, attesting that this product can be reliably used in building applications. Subject to compliance with the stipulations of section 1.2 of the general approval, it has also been assigned to reaction to fire performance Euroclass B-s2, d0 for fire-retardant building materials in accordance with DIN EN 13501-1.

Easy to Install – Optimal Protection

Right from the start – during installation – the new KRONOPLY OSB SF-B “protects” the site, the environment and the strength of carpenters and other tradesmen. Compared to other flame-resistant products such as cement-bonded chipboard and plasterboard, KRONOPLY OSB SF-B is lightweight and both faster and easier to use. The installation of heavy boards containing cement or plaster releases dust and blunts tools. Often, they can only be installed with self-tapping screws. Owing to their high cement content, production of them also results in relatively great environmental contamination compared to KRONOPLY OSB SF-B, which is a wood-based material.

Applications

The new KRONOPLY OSB SF-B, square-edge complies with the fire protection requirements for use in public buildings such as schools, kindergartens, hospitals, sports facilities, commercial buildings and trade show stands.

• Bearing and stiffening wall and ceiling cladding
• Timber-frame and wood-panel construction
• Commercial construction
• Trade show booths
• Ceiling panelling
• Flooring
  

		Strand direction
		Major axis		Minor axis
Nominal board thicknesses [mm]	d	12 - 18	> 18 - 22	12 - 18	> 18 - 22
Strength values [N/mm²]
Bending	fm,k	16.4	14.8	8.2	7.4
Compression	fc,90,k	10.0		10.0
Shear	fv,k	1.0		1.0
Plate loading
Bending	fm,k	9.4	9.0	7.0	6.8
Tensile force	ft,k	9.4	9.0	7.0	6.8
Compression	fc,k	15.4	14.8	12.7	12.4
Shear	fv,k	6.8		6.8
Stiffness values [N/mm²]
Stresses on board
Modulus of elasticity	Em,meana	4930		1980
Shear modulus	Gmeana	50		50
Plate loading
Modulus of elasticity	Em,meana	3800		3000
Shear modulus	Gmeana	1080		1080
a The characteristic stiffness values E05 and G05 are calculated as follows: E05 = 0.85 x Emean and G05 = 0.85 x Emean
General and building physics values
Bulk density acc. to EN 323	m	600 kg/m³
Max. deviations in board thickness		± 0.8 mm (unsanded)
Tensile strength perpendicular to plane acc. to EN 319	zul σZy	0.15	0.13	0.15	0.13
Thermal conductivity acc. to EN 13986	λ	0.13 W/mK
Water vapour permeability value	μ	200 / 300
Thickness swelling acc. to EN 317		≤ 15 %
Emissions class		E1 – 100% formaldehyde-free binders
Utilisation classes acc. to EN V 1995-1-1		1 + 2
Reaction to fire performance class acc. to EN 13501-1		B - s2, d0
CE certificate no.		1034 – CPD – 1899/1/2010
Applicable German technical approval		Z-56.275-3563

Format [mm]	Thickness [mm]
	9	10	12	15	18	22	25	30	40
2500 x 1250				•	•
3000 x 1250			•	•	•

Laying and Boarding

• For interior or exterior boarding applications, leave expansion joints at least 3 mm wide between boards.
• When laid closely with butt joints in interior walls, leave room for expansion where the boards adjoin other structures.
• The storey-high formats are produced with a slightly reduced width (of 1247 mm) to allow for expansion.

Coating and Varnishing

• KRONOPLY OSB with a ContiFinish^® surface may be coated with a solvent-containing PU (DD) or synthetic-resin varnish.
• Sanded surfaces may be coated like normal wood (e.g. with varnishes, paints, oils, waxes and glazes).
• It is advisable to apply at least three coats, sanding after the first one.
• Application of at least three coats is recommended.
• The only way to achieve an absolutely smooth surface is to apply filler.

Transport and Handling

• Take steps to prevent the boards, and especially the unprotected edges, from absorbing large amounts of moisture during transport and installation. Be careful not to damage the edges when lifting, moving and stacking boards (this applies especially to tongue-and- groove boards).
• Check against the labels or producer’s documentation on-site to make sure that the following are correct: thickness, approved utilisation class, surface (sanded or ContiFinish®) and edge type (square-edged or tongue-and-groove).
• During installation, boards may be briefly leaned against a solid structure at a 70° angle.
• Always carry individual boards in an upright (vertical) position.

Storage

• Protect boards from exposure to significant moisture or very high relative humidity.
• Prevent direct contact of the boards with the floor. ■ Only store outdoors temporarily, and if unavoidable cover stacks with watertight but water-vapour-permeable tarpaulins.
• Always stack boards horizontally on pallets and wooden supports (spaced no more than 600 mm apart).
• Align wooden supports precisely with one another and parallel to the shorter side of the boards.
• Lay the boards so their edges line up (with a maximum overhang of 15 mm).

Acclimatisation

• Precondition boards prior to installation.
• Store boards for about three days under the same climatic conditions that prevail at the installation site.
• This adjustment to the ambient moisture at the installation site will prevent excessive shrinkage or swelling.

Sawing, Milling, Sanding and Drilling

• KRONOPLY OSB can be sanded, sawn, milled and drilled just like solid wood and using all of the same tools.

Nailing, Stapling, Screwing and Gluing

• KRONOPLY OSB can be attached to wooden studs and rafters using screws, nails or staples.
• Use in accordance with the official approvals and standards (Z-9.1-618, Z-9.1-503 and DIN 1052 in Germany as well as EN 1995-1-1 (EC 5)).
• Additionally bond or glue tongue-and-groove joints.