SWISS KRONO OSB/3, EN300, T+G - Sanded on both sides
Naturally Stable with Tongue-and-Groove Joints
made with formaldehyde-free binders

Naturally Stable with Tongue-and-Groove Joints

SWISS KRONO OSB/3, T + G is sanded on both sides, CE-certified under EN 13986 and produced in compliance with EN 300. All four edges are profiled for tongue-and-groove joints, making it excellently suited for seamless laying.

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

Ideal for Direct Coating

Being sanded on both sides, SWISS KRONO OSB/3 EN300, T + G can be coated just like normal wood. Varnishes, oils, waxes and glazes of all kinds should be applied in multiple coats (as a rule, at least three). Intermediate sanding after applying the first coat improves the final result.

The good technical properties and seamless surface of SWISS KRONO OSB/3 EN300, T + G make it excellently suited for renovation and for building new, eco-friendly houses. The precisely fitting tongue-and-groove system makes it quick and easy to lay directly on rafters or over footfall noise insulation.

Applications

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.

SWISS KRONO Flat Roof System

Components from the top down

• Rabbeted zinc plate
• Structured separation layer
• 22mm SWISS KRONO OSB
• 200mm rafters / SWISS KRONO flex (thickness variable)
• Moisture-adaptive vapour barrier
• 30/50mm battens/air layer
• 15mm SWISS KRONO OSB
• 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.

• Floor renovation
• Dry and screed floors
• Roof or floor boarding with a stiffening effect
• Walls, closets and stairs
• Decorative uses

		Strand direction
		Major axis			Minor axis
Thickness range [mm]	d	6 to 10	>10 to 18	>18 to 25	6 to 10	>10 to 18	>18 to 25
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
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 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_048

Format [mm]	Thickness [mm]
	9	10	12	15	18	22	25	30	40
	Pieces per pallet
2500 x 675 T + G on all 4 edges				60	52	42	38

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

• 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.

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

• 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.