Table of contents:
- The right plate for construction and expansion
- Fire protection and fire resistance of OSB panels
- Fire protection planking made of OSB boards
Video: Fire protection for OSB panels
Fire protection is so important for OSB boards because the large-format board materials shorten the working hours enormously, craftsman costs are saved and OSB boards should not be installed without a certain level of fire protection.
OSB boards consist of peeling chips, which are called "strands" in English. They are mainly made from pine wood, ten to 15 centimeters long and two to three centimeters wide. The chips are arranged lengthways, crossways and again lengthways one above the other (“oriented”), wetted with glue resins and pressed into boards (“boards”) under pressure and high temperature. "Oriented strand boards", or OSB boards for short, are easy to machine with cutting tools and can be sawn, drilled, milled and sanded - almost like solid wood.
The mechanical properties of OSB panels are regulated by DIN EN 300. The standard material class for timber system construction is the so-called OSB / 3 panel according to DIN EN 300. However, this standard has not been introduced for a long time - the strength and rigidity values in the DIN EN 300 is usually below that of a general building inspectorate approval.
The right plate for construction and expansion
There are different versions, for example made of 120 to 150 millimeter long pine wood veneer strips - crosswise orientation makes the material dimensionally stable and high-strength. The boards are generally far below the requirements of the E1 guidelines for the emission of formaldehyde. In the so-called endless process, the panel surfaces are given a high-quality coating, they are water-repellent and diffusion-inhibiting - if you use them as interior cladding for the wooden frame outer walls, you can do without a vapor-blocking film. OSB boards are stronger than particle boards, thinner boards are sufficient. If a 30 mm thick chipboard were required, a 22 mm OSB board is sufficient. This saves material and construction weight and means lower processing and transportation costs.
Thinner panels provide additional space - for more living space or a layer of thermal insulation. The building inspectorate approval for the panel thicknesses of eight to 25 millimeters enables internal and external walls, ceilings and roofs to be stiffened with OSB panels. Floor-to-ceiling formats avoid horizontal bumps and make the outer shell denser - panel formats matched to the production grid of 62.5 centimeters allow efficient work. OSB panels are available with a rough and polished surface, also with grooves and tongues on two or four sides - for example for use as floor panels. The panels also make an interesting material for furniture, shelves and doors. Practical: You can paint OSB panels and adapt them to your individual needs.
Fire protection and fire resistance of OSB panels
The fire protection class for OSB panels (B 2 - normally flammable) is regulated in the building inspectorate approval. A certain fire resistance period is required for some constructions, e.g. F-30 - the suitability is proven by a test certificate. Such tested constructions are usually made with special fire protection boards, for example calcium silicate or fire protection boards made of plasterboard. In addition, there is the possibility of producing proven designs with a defined fire resistance duration, which do not have to be verified by a test certificate. Such constructions are listed in DIN 4102-4 - the planking often consists of chipboard.
Fire protection planking made of OSB boards
OSB / 3 and OSB / 4 panels are not calculated according to the European standard EN 300, but are approved by the building authorities. The values in the building inspectorate approval are higher, which brings advantages for the static calculation. According to DIN 4102-4, constructions made of OSB boards can also be used for fire protection - the approval notes that the same stipulations for fire behavior of components and building materials apply to OSB boards as for chipboard (flat pressed boards).
OSB / 3 and OSB / 4 can be used for the constructions shown in DIN 4102-4 as cladding or cladding of walls, ceilings and roofs in wooden panel construction - often no other materials are required for the fire protection construction apart from the OSB panels. It should only be noted that the minimum thicknesses shown in DIN 4102-4 apply to chipboard. If they are not available, simply grab the plate with the next higher thickness.