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SWISS KRONO OSB/4 EN300, T+G - ContiFinish®
Make Roofs for Extreme Stresses Fast

ContiFinish®, made with formaldehyde-free binders, CE, PEFCTM

Make Roofs for Extreme Stresses Fast

With tongue-and-groove joints on two or four sides, SWISS KRONO OSB/4 EN300 – T + G, ContiFinish®, German technical ap- proval Z-9.1- 618, conforms to CE EN 13986 (OSB/4) – ensures rapid progress in building your roof. Especially for applications that call for high strength and dimensional stability, this constructive, eco-friendly wood-based material is the right choice.

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

Outstanding Environmental Properties and Structural Strength

With its excellent technical properties and made using only formaldehyde-free binders, SWISS KRONO OSB/4 EN300, T + G is the modern all-round- er. Whenever there are considerable expectations with regard to structural strength, building physics and healthy living, the pros go for SWISS KRONO OSB/4 EN300, T + G. This diffusion-inhibiting material is approved for stiffening interior and exterior walls, ceilings and roofs, amongst other uses.


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/4 EN300, T + G. 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/4 EN300, T + G 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 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
  • Roof panelling (instead of raw timber)
  • For reinforcing heavily stressed roofs (application 2 as per EN 1995-1-1)

Strand direction

Major axis Minor axis
Thickness range [mm] d 10
Strengh values [N/mm²]
Stresses on board
Bending fm,k 28,0 23,0 27,5 14,0 12,5 19,0
Shear fv,k 1,5 1,5
Plate loading

Bending fm,k 19,5 17,0 10,9* 13,5 12,5 8,0*
modulus of elasticity ft,k 12,0 10,5 11,5 8,0 7,5 11,0
Compression fc,k 14,0 12,5 14,5 11,0 10,5 14,5
Shear fv,k 8,0 7,0 7,0 8,0 7,0 7,0
Stiffness values [N/mm²]

Stresses on board

Bending modulus of elasticity Ema 6500 7500 3000 3500
Shear modulus Gra 100 70 100 90
Plate loading

Bending modulus of elasticity Eta 3500 2500 3000
Compression modulus of elasticity Eca 3500 2500
Shear modulus Gva 1000 1100 1000 1100
aThe characteristic stiffness values E05 and G05 are calculated as follows: E05 = 0,9 x E and G05 = 0,9 x G
*This value is not covered for thicknesses > 25 mm
Genereal and building physics values

Bulk density acc. to EN 323 m ≥ 620 kg/m³
Max. deviations in board thickness
mm ± 0,4 mm ± 0,8 mm
± 0,3 mm**
± 0,4 mm** ± 0,8 mm
± 0,3 mm**
Tolerance in length and width ± 3 mm
Perpendicularity acc. to EN 324-2 2 mm/m
Thermal conductivity acc. to DIN EN 13986 λ 0,13 W/mK
Water vapour resistance sd ≥ 2,0 m (from 12 to 30 mm) - dry (μ x d)
Air tickness acc. to EN 12114 at 50 Pa 0,12 [m³/hm²]
Thickness swelling acc. to EN 317 ≤ 9 % ≤ 8 % ≤ 9 % ≤ 8 %
Coefficient of expansion for 1% change in wood moisture content 0,015 %
Waste code 03 01 05
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)
EPD as per ISO 14025 and 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. CPRs SKDE_OSB-4_CPR_2020_055
Format [mm] Thickness [mm]


Pieces per pallet
2500 x 675 T + G on all 4 edges

* 60


2500 x 1250 T + G on all 4 edges
* 60

Special formats and thicknesses on request

Laying and Boarding

  • When laid closely with butt joints in interior walls, leave room for expansion where the boards adjoin other structures.

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
P00913 SWISS KRONO OSB Installation Manual - Natural Stability - English
P00595 SWISS KRONO OSB Material Safety Data Sheet - English
P00946 SWISS KRONO Product Tolerances - English
Product documents
Art. No. Title
P01036 Base Details - English
P01035 Base Details - English
P00939 KRONOPLY OSB/F**** Formaldehyde release acc. to DIN EN 717-1 - English
K00316 PEFCTM Chain-of-Custody Certificate - English
P01351 SWISS KRONO Expansion Joints in Rooms - English
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
P01355 SWISS KRONO Installation Guide for Roofs - English
P01352 SWISS KRONO Installation Scheme for Floors - English
P01332 SWISS KRONO Installation scheme - English
P01047 SWISS KRONO Interior Fire Wall - English
P01354 SWISS KRONO Layers of SWISS KRONO OSB - English
P01362 SWISS KRONO OSB on Substructure - English
P01357 SWISS KRONO OSB under Metal Roofing in Pitched Roofs - English
P01356 SWISS KRONO OSB under Shale Roofing - English
P00417 SWISS KRONO OSB/4 EN300 Datenblatt - English
P01350 SWISS KRONO Various Laying Schemes - English

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