Learn more about the use and applications of EGGER OSB from the questions below.
OSB is mainly used in the construction of new timber frame houses with standard or high energy saving requirements (low energy, passive or zero energy houses), but also for refurbishment of existing houses, for attics conversion and/or for adding storey.
But there are a lot of other possible side usage of the product, such as manufacturing of structural I-joist beams with OSB-webs, concrete shuttering, job-site hoarding, construction of stages, billboards, cabinets, shelves, packaging, garages, site barracks, exhibition stands, storage rooms, animal shelters, etc – in other words, whenever a rigid and affordable board is needed for indoor or limited outdoor use.
OSB is used as a stiffening or load-bearing component of the main structural elements of timber frame houses:
Walls (External / Internal) - wall sheathing on studs
Floors - structural floor decking on joists (subfloor), rigid underlay for floor covering in floating floors and/or structural floors
Roofs - roof sheathing on rafters (rigid underlay for roof covering) or below rafters Staircase - steps (rigid underlay for steps covering)
Learn more about the external uses of EGGER OSB from the questions below.
OSB/3 or OSB 4 TOP can be installed as outside sheathing, but only covered by additional skins, such as cladding (ventilated or non-ventilated façades) or roof covering (asphalt shingles, metal roofing, clay/concrete tiles, etc). OSB left exposed (not protected) to weathering is not allowed!
Yes, wood-based panels certified as service class 3 (exterior grade) can be used.
Learn more about the exapansion gaps in relation to EGGER OSB from the questions below.
Expansion (dilatation) gaps are narrow distances that must be provided at the panel joints when fixing the straight-edge OSB boards on supports, in order to avoid dilatation stress on the board’s edges that could lead to buckling and disturbing squeaking noises.
Expansion gaps allow the boards to expand unrestricted before reaching the equilibrium moisture, which is likely to happen if the panels were not conditioned to the end-use climate before being installed.
The following rules must be noticed:
1.A dilatation gap of 2-3mm must be provided between all adjoining boards when fixing them on the supports; the gap must be continuous on all the 4 edges of each panel
2.A dilatation gap of 15mm must always be left on the room perimeter, between the floor-decking boards and the walls, if T&G panels are used; if using straight-edge panels, the expansion gap can be lower, and should be calculated
3.A dilatation gap of 25mm must be left from the floor when fixing the boards on the studs, for the wall sheathing
4.A permanently elastic expansion gap of 10mm must be provided every 10m of continuous sheathing (floor, roof, wall)
For more details regarding correct installation of panels, the manufacturer’s guideline must be consulted.
Find out more about fixing and gluing EGGER OSB with the following questions.
When fixing OSB, priority should be given to the use of galvanized wood screws (self drilling or self tapping), spiral / ring nails or staples.
Smooth shank nails are less suitable, because of their lower pull-out resistance.
Please follow the general installation instructions of the OSB manufacturer regarding the fasteners selection and the fixing distance.
Yes. When 2 boards are needed to be fixed to one another - for instance, in case of a double layer floating floor, gluing is also a possibility.
Permanently elastic adhesives based on polyurethane or silane are suitable.
Sanded boards are more suitable for gluing. If using unsanded panels, is mandatory to slightly sand the surface before applying the binder, to increase the glue adhesion.
Exception is given to Eurostrand OSB 4 TOP, using the glue type Purbond HB 180/440/530.
The base boards must be plane, strong and dry, free of any loose or crumbly particles, free of oil, dust and dirt.
The adhesive can be applied either spread on the whole surface by means of a notched trowel, or „on-bead“ by using a gun, that is in longitudinal continuous lines spaced 120-150mm.
Read the questions below to find out more about surface treatments and panel finishing with EGGER OSB.
Yes, but in order to avoid the visible undesired "bleeding stains" of the support, we highly recommend to use sanded OSB panels and to apply 2-3 thin layers of primer before starting to plaster or paint.
Also, we recommend to perform the so called "paint test", to check the compatibility of the paint compounds with wood.
Absolutely. The wood strands in the surface layer of the boards “ennobles” and give walls or floors surface the warm and rustic look of the natural wood.
For an improved visual appearance and a dust-free surface, we recommend the use of T&G sanded panels, which can be simply coated with transparent or pigmented wood lacquers.
We recommend in all cases the use of permanent elastic water-free wood adhesives (polyurethane-based) for gluing massive parquets on OSB underlayment, to avoid excessive shrinkage of the parquet caused by moisture uptake from the binder.
It goes without saying that the surface of underlayment (OSB) must be absolutely dry, stable, and free of dust, dirt, grease and any other loose or crumbly particles.
Find out more about using an external bonded insulating system with EGGER OSB by reading the questions below.
Fixing of ETICS on the external walls of the building is commonly done by first bonding the insulation boards (stonewool, EPS) on the walls with adhesive mortar (cement based), and second by additional mechanical fixing with dowels.
When the fixing support is masonry, concrete or aerated concrete (Ytong), the use of dowels is okay, but in case of OSB, they just cannot be used, because the fixing element is too thin for them to anchor.
In this case, mechanical fixing is not possible and the insulating boards should only be bonded.
To select the right adhesive, please contact the manufacturer of the ETICS system.
In order to avoid the damages resulting from the accumulation of condensation water inside the building elements, EGGER always recommends the diffusion open systems for external walls and roofs.
A typical such system for the external walls of a timber frame house consists of OSB wall sheathing on the inside, and a paneling with a diffusive / vapor permeable product (such as DHF or wood-fibreboards) on the external side of the studs.
When a diffusion closed system is chosen (for instance, with OSB on the inside and outside), the insulation of the walls is commonly provided by the use of external thermal insulating cladding systems (ETICS), whose insulating component is either mineral wool or EPS / expandable polystyrene (most common).
Since the façade mineral wool is hydrophobic (that is, it leaves the vapors to go out, but doesn’t allow moisture to get in), is more likely that condensation will not occur when using these products, so therefore we recommend the use of mineral wool.