Make Roofs for Extreme Stresses Fast

With tongue-and-groove joints on two or four sides, KRONOPLY OSB/ F**** (”F four stars“) – T + G, ContiFinish^®, German technical ap- proval Z-9.1- 618, monitored by HFB ENGINEERING GMBH, 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.

Outstanding Environmental Properties and Structural Strength

With its excellent technical properties and made using only formaldehyde-free binders, KRONOPLY OSB/ F**** 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 KRONOPLY OSB/ F****. This diffusion-inhibiting material is approved for stiffening interior and exterior walls, ceilings and roofs, amongst other uses.

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 fl at roof constructions that are largely prefabricated and lie on rafters spaced far apart.

Predestined for use in many fl at roofs are KRONOPLY OSB/3 and KRONOPLY F****. KRONOPLY 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

KRONOPLY OSB/3 and KRONOPLY F**** fulfi l 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 fl at roof constructions. In contrast to the wood-based materials ordinarily used in fl at roofs, KRONOPLY OSB/3 and KRONOPLY F**** do not require any chemical treatment.

Another advantage is that KRONOPLY OSB is much faster to lay than roof boarding. If you use it together with eco-friendly KRONOTHERM flex wood-fibre insulation, you can count on a very good moisture barrier.

• 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
Nominal board thicknesses [mm]	d	8 to ≤18	>18 to ≤25	>25 to 30	8 to ≤18	>18 to ≤25	>25 to 30
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	17.0	13.5	12.5	12.5
Tensile force	ft,k	12.0	10.5	10.5	8.0	7.5	7.5
Compression	fc,k	14.0	12.5	12.5	11.0	10.5	10.5
Shear	fv,k	8.0	7.0	7.0	8.0	7.0	7.0
Stiffness values [N/mm²]
Stresses on board
Modulus of elasticity	Em,meana	6500			3000
Shear modulus	Gmeana	100			100
Plate loading
Modulus of elasticity	Em,meana	3500			2500
Modulus of elasticity Tensile force	Et,meana	3500			2500
Modulus of elasticity Compression	Ec,meana	3500			2500
Shear modulus	Gmeana	1000			1000
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	620 kg/m³
Max. deviations in board thickness		± 0.4 mm
Embedment strength	zul 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	μ	200 / 300
Thickness swelling acc. to EN 317		≤ 9 %
Emissions class		E1 – 100% formaldehyde-free binders <0.03 ppm
Utilisation classes acc. to EN V 1995-1-1		1 + 2
Reaction to fire performance class acc. to EN 13501-1		D - s2, d0
Applicable German technical approval		Z-9.1-618

Format [mm]	Thickness [mm]
	9	10	12	15	18	22	25	30	40
2500 x 675				•	•	•	•	•
2500 x 1250			•	•	•	•	•
6250 x 675 T + G on 2 edges						•	•

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

• 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.