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SWISS KRONO OSB/3 EN300, square-edge - ContiFinish®
The High-Performance Classic All-Rounder
ContiFinish®, made with formaldehyde-free binders, CE, PEFCTM

The High-Performance Classic All-Rounder

For load-bearing and stiffening applications, the ideal wood-based material is SWISS KRONO OSB/3, CE-certified according to EN 13986 and produced in compliance with EN 300. Featuring a ContiFinish® surface, this sturdy board is also excellently suited for load-bearing uses in kitchens, bathrooms and laundry rooms.

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

High Strength and ContiFinish® Surface

Designed to withstand normal stresses, SWISS KRONO OSB/3 EN300 is outstanding value for money. Produced exclusively with formaldehyde-free binders, these robust boards contain only the formaldehyde that is bound up in natural wood. Consequently, their formaldehyde emis- sions not only comply with the stipulations of the E1 guideline, but are also significantly less than the much stricter ceiling of 0.03 ppm called for by various associations (e.g. DHV and RAL in Germany). SWISS KRONO OSB/3 EN300 boards are also used as eco-friendly wood-based materials in packaging and furniture.


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 EN300 and SWISS KRONO OSB/4 EN300 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.

KRONOPLY Flat Roof System

Components from the top down

  • Rabbeted zinc plate
  • Structured separation layer
  • 200mm rafters / KRONOPLY flex (thickness variable)
  • Moisture-adaptive vapour barrier
  • 30/50mm battens/air layer
  • 9.5mm gypsum plasterboard

Fast to Lay and No Chemicals

SWISS KRONO OSB/3 EN300 and SWISS KRONO OSB/4 EN300 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 EN300 and SWISS KRONO OSB/4 EN300 F****, square-edge do not require any chemical treatment.

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

  • Interior and exterior wall boarding with a stiffening effect
  • Load-bearing ceiling boarding
  • Roof boarding (instead of raw timber)
  • Wall cladding
  • Floors
  • Packaging
  • Shelves
  • Furniture
  • Doors

Strand direction
Major axis Minor axis
Thickness range [mm] d 6
Strength values [N/mm²]
Stresses on board
Bending fm,k 18.0 16.4 14.8 9.0 8.2 7.4
Compression fc,90,k 10.0 10.0
Shear fv,k 1.0 1.0
Plate loading
Bending fm,k 9.9 9.4 9.0 7.2 7.0 6.8
Tensile force ft,k 9.9 9.4 9.0 7.2 7.0 6.8
Compression fc,k 15.9 15.4 14.8 12.9 12.7 12.4
Shear fv,k 6.8 6.8
Stiffness values [N/mm²]
Stresses on board
Bending modulus of elasticity Ema 4930 1980
Shear modulus Gra 50 50
Plate loading
Tensile force modulus of elasticity Eta 3800 3000
Compression modulus of elasticity Eca 3800 3000
Shear modulus Gva 1080 1080
a The characteristic stiffness values E05 and G05 are calculated as follows:
E05 = 0.85 x E and G05 = 0.85 x G
General and building physics values
Bulk density acc. to EN 323 m 600 kg/m³
Max. deviations in board thickness ± 0.8 mm (ContiFinish®)
± 0.3 mm (sanded)
Tolerance in length and width ± 3 mm
Perpendicularity acc. to EN 324‐2 2 mm/m
Thermal conductivity acc. to EN 13986 λ 0.13 W/mK
Water vapour permeability value sd ≥ 2.0m (from 12 to 25mm) ‐ dry
Waste code 03 01 05
Air thickness acc. to EN 12114 at 50 Pa 0.12 [m³/hm²]
Thickness swelling acc. to EN 317 ≤ 15%
Coefficient of expansion for 1% change in wood moisture content 0.03%
Emissions class E1 – 100% formaldehyde-free binders
(< 0.03 ppm)
VOC‐emission / DIBt‐Certificate: G‐160‐18‐0001: 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 an EN 15804 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_048
Format [mm] Thickness [mm]

9 10 12 15 18 22 25 30 40

Pieces per pallet
2500 x 1250 100 *

2070 x 2770


2650 x 1250


2800 x 1250


3000 x 1250


5000 x 1250


5000 x 2500


* On request

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

  • 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

  • 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
P01732 SWISS KRONO LONGBOARD OSB und MAGNUMBOARD® OSB Quality management and Processing instructions - GB
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
P00913 SWISS KRONO OSB Installation Manual - Natural Stability - English
P00595 SWISS KRONO OSB Material Safety Data Sheet - English
P00946 SWISS KRONO Product Tolerances - English
P01459 Sintef OSB/3 Certificate - English
Product documents
Art. No. Title
P01036 Base Details - English
P01035 Base Details - English
P00940 KRONOPLY OSB/3 Formaldehyde release acc. to DIN EN 717-1 - English
K00316 PEFCTM Chain-of-Custody Certificate - English
P01468 SKDE_OSB-3_CPR_2019_048_EN
P01045 SWISS KRONO Exterior Wall with Sheet-Metal Cladding, e.g. for Dormer Cheeks - English
P01359 SWISS KRONO Exterior Walls, OSB Inside and Outside - English
P01353 SWISS KRONO Installation in Walls - English
P01047 SWISS KRONO Interior Fire Wall - English
P01354 SWISS KRONO Layers of SWISS KRONO OSB - English
P01331 SWISS KRONO Laying Instructions for Walls - English
P00955 SWISS KRONO OSB - CodeMark Australia - English
P01360 SWISS KRONO OSB in Exterior Walls - English
P01357 SWISS KRONO OSB under Metal Roofing in Pitched Roofs - English
P01456 SWISS KRONO OSB/3 - Certificate of Compliance - English
P00088 SWISS KRONO OSB/3 CE certificate - English
P00415 SWISS KRONO OSB/3 data sheet - English
P01156 SWISS KRONO OSB/3 dimensioning reference tables - English
P00942 SWISS KRONO OSB/3 in 30 and 40 mm data sheet - English
P01459 Sintef OSB/3 Certificate - English

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