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SWISS KRONO OSB/F****, BAZ, square-edge - ContiFinish®
Environmental-Friendly Building
ContiFinish®, German technical approval Z-9.1-618, monitored by
HFB ENGINEERING GMBH, made with formaldehyde-free binders, CE, PEFCTM

Complete Security

Simply our best: SWISS KRONO OSB/ F**** (”F four stars“), ContiFinish®, German technical approval Z-9.1- 618, monitored by HFB ENGINEERING GMBH, conforms to CE EN 13986 (OSB/4). It is as strong as MAGNUM BOARD, which is made from it, and absolutely
conducive to healthy living, as it is made with completely formaldehyde-free binders. Its principal application is in eco-friendly timberframe construction.

A Harmonised System

On the Services page, you can download a large number of system modules for building new houses and modernising and renovating existing ones with SWISS KRONO products. Click here to go straight to the download section

The Eco-Friendly Wood-Based Material of the Future

As one of the world’s leading producers of environmentally friendly wood-based materials, we rely entirely on natural raw materials. That means using wood from the maintenance and thinning of sustainably managed forests to make our premium product: SWISS KRONO OSB/F****, square-edge. Its formaldehyde emissions are not only below the E1 ceiling of 0.1 ppm, but are even considerably lower than the stricter maximum of 0.03 ppm that other organisations are calling for. As a result, it is even suitable for packaging food. When it is used in transport or to package sensitive foods, the ContiFinish® surface effectively keeps out moisture and damp.


Flat Roofs – Economical Constructions

Flat roofs are roof constructions that are horizontal or or have a low pitch. The entire surface area is typically covered with a waterproof membrane. Modern timber-frame houses allow the installation of economical flat roof constructions that are largely prefabricated and lie on rafters spaced far apart.

Predestined for use in many flat roofs are SWISS KRONO OSB/3 and SWISS KRONO OSB/F****, square-edge. SWISS KRONO products let you create durable constructions that meet thermal, acoustical and ventilation requirements while also complying with the stipulations of the new DIN 68800 standard.

Fast to Lay and No Chemicals

SWISS KRONO OSB/3 and SWISS KRONO OSB/F****, square-edge fulfil the requirements of various standards owing to their moisture-resistant PMDI binders.
Outstanding results have been obtained with these materials in a large number of flat roof constructions. In contrast to the wood-based materials ordinarily used in flat roofs, SWISS KRONO OSB/3 and SWISS KRONO OSB/F****, square-edge do not require any chemical treatment.

Another advantage is that SWISS KRONO OSB is much faster to lay than roof boarding.

  • Wood-frame and engineered wood construction
  • Construction for industry / commercial housing construction
  • Shops and trade fair stands (for decorative uses)
  • Trade fair stands / concrete formwork / prefabricated houses
  • As load-bearing ceiling boards
  • Floors subject to heavy foot traffic
  • For reinforcing heavily loaded walls
  • Packaging

With cutting-edge production equipment, it is possible to make boards up to 15 metres long. Used to build homes and industry structures, these long boards speed construction work

Strand direction

Major axis Minor axis
Thickness range [mm] d 10
Strength values [N/mm2]
Stresses on board
Bending fm,k 28.0 23.0 23.0 14.0 12.5 12.5
Shear fv,k 1.5 1.5
Plate loading
Bending fm,k 19.5 17.0 13.5 12.5
Tensile force ft,k 12.0 10.5 8.0 7.5
Compression fc,k 14.0 12.5 11.0 10.5
Shear fv,k 8.0 7.0 8.0 7.0
Stiffness values [N/mm2]
Stresses on board
Bending modulus of elasticity Em,mean 6500 3000
Shear modulus Gmean 100 100
Plate loading
Tensile modulus of elasticity Et,mean 3500 2500
Bulk modulus of elasticity Ec,mean 3500 2500
Shear modulus Gmean 1000 1000
a The characteristic stiffness values E05 and G05 are calculated as follows:
E05 = 0.9 x Emean and G05 = 0.9 x Emean
General and building physics values
Bulk density acc. to EN 323 m 620 kg/m3
Max. deviations in board thickness ± 0.4 mm
Tolerance in length and width ± 3 mm
Perpendicularity acc. to EN 324‐2 2 mm/m
Embedment strength perm. σI 5.0 4.0
Tensile strength perpendicular to plane acc. to EN 1087-1 σZy 0.14 0.12 0.10 0.14 0.12 0.10
Thermal conductivity acc. to EN 13986 λ 0.13 W/mK
Water vapour permeability value sd ≥ 2.0m (from 12 to 30mm) ‐ dry
Thickness swelling acc. to EN 317 ≤ 9%
Coefficient of expansion for 1% change in air moisture 0.003%
Waste Code 03 01 05
Emissions class E1 – 100% formaldehyde-free binders
(< 0.03 ppm)
VOC‐emission / DIBt‐Certificate: G‐160‐18‐0005: Compliance with the Health Protection Requirements for Building Structures in acc. with Annex 8 of the German Model Administrative Regulation on Technical Construction Requirements (MVVTB 2017/1)
Environmental Product Declaration as per ISO 14025 and EN 15084 EPD-KRO-20150067-IBD2-EN
Service classes acc. to EN 1995-1-1 1 + 2
Reaction to fire acc. to EN 13501-1 D-s2, d0
Declaration of Performance No. acc. to CPR SKDE_OSB-3_CPR_2019_049
Applicable German technical approval Z-9.1-618
Format [mm] Thickness [mm]

9 10 12 15 18 22 25 30 40

Pieces per pallet
2500 x 1250

* 32

2650 x 1250


2800 x 1250


3000 x 1250


Special formats and thicknesses on request

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

  • SWISS KRONO 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.

Important Note on Coating and Painting!
When coating SWISS KRONO OSB with oil or hard wax oil, under some circumstances ingredients in the oil may interact with the natural wood resin in the SWISS KRONO OSB. This can result in an intense, lasting odour in the room. We therefore recommend that you contact the manufacturer of the oil or hard wax oil before using it.

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.


  • 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).


  • 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

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

Nailing, Stapling, Screwing and Gluing

  • SWISS KRONO 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.

Downloadable documents

Art. No. Title
P00450 SWISS KRONO Delivery programme Flyer - English
P00086 SWISS KRONO OSB Environmental product declaration (EPD) - English
P00241 SWISS KRONO OSB Full-line catalogue Brochure - English
P00595 SWISS KRONO OSB Material Safety Data Sheet - English
P00946 SWISS KRONO Product Tolerances - English
Product documents
Art. No. Title
K01035 Base Details - English
K01036 Base Details - English
P00939 KRONOPLY OSB/F**** Formaldehyde release acc. to DIN EN 717-1 - English
K00316 PEFCTM Chain-of-Custody Certificate - English
P01478 SKDE_OSB-F4S_CPR_2019_049_EN
K01045 SWISS KRONO Exterior Wall with Sheet-Metal Cladding, e.g. for Dormer Cheeks - English
K01359 SWISS KRONO Exterior Walls, OSB Inside and Outside - English
K01353 SWISS KRONO Installation in Walls - English
K01047 SWISS KRONO Interior Fire Wall - English
K01354 SWISS KRONO Layers of SWISS KRONO OSB - English
K01331 SWISS KRONO Laying Instructions for Walls - English
P00087 SWISS KRONO OSB F**** CE certificate - English
K01360 SWISS KRONO OSB in Exterior Walls - English
P00417 SWISS KRONO OSB/F**** Data Sheet - English
P01155 SWISS KRONO OSB/F**** dimensioning reference tables - English

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