OSB Boards

Oriented Strand Board (OSB) is an engineered wood-based panel, in which long strands of wood are bonded together with a synthetic resin adhesive. OSB is usually composed of three layers with the strands of the outer two layers orientated in more often than not in the long direction of the panel. Made of strands normally about 75mm long with the strands in the surface layer oriented roughly in line with the length of the panel. OSB are used in flooring, wall sheathing, roof sarking, packaging and furniture. Some specialist products, with a surface coating, are used for non-structural applications, such as site hoarding, giving an extended service life. It was invented by Armin Elmendorf in California in 1963.


Oriented strand board is manufactured in wide mats from oriented layers of thin, rectangular wooden strips compressed and bonded together with wax and synthetic resin adhesives. The wood is shredded into strips, then sifted and placed in layers. After drying, these flakes are generally sprayed with a synthetic resin binder and wax. Wood strips on the external layers are aligned in the long direction, while internal layers are perpendicular. The number of layers placed is determined partly by the thickness of the panel and the individual layers can vary in thickness to give different finished panel thicknesses. The mat is compressed in a thermal press to compress the flakes and bond them by heat and curing of the resin. Then the boards are cut into standard sizes.

The adhesive resins used are;

  • urea-formaldehyde - OSB type 1, non-structural, non-waterproof,
  • isocyanate based glue with melamine-urea-formaldehyde or phenol formaldehyde resin glues at surface - OSB type 2, structural, water resistant on face)
  • phenol formaldehyde resin throughout - OSB types 3 and 4, structural, for use in damp and outside environments.

BS EN 300 differs OSB panels into four technical classes;

  • OSB/1 General purpose boards, and boards for interior fitments (including furniture) for use in dry conditions,
  • OSB/2 Load-bearing boards for use in dry conditions,
  • OSB/3 Load-bearing boards for use in humid conditions,
  • OSB/4 Heavy-duty load-bearing boards for use in humid conditions.

OSB should generally be kept away from direct contact with water. Panels for use in humid conditions have a resistance to short term wetting and high humidity, but should be kept away from prolonged wetting. OSB will not normally be attacked by wood boring insects, but panels made using aspen and spruce are susceptible to fungal attack under prolonged wet conditions, while OSB panels made from pine have moderate resistance to attack.

OSB density varies depending upon the timber species and the process used in manufacture, typically are between 600kg/m3 to 680kg/m3. The typical sizes are 2440mm 1200mm, 2440mm 1220mm and 3660mm 1220mm and in thicknesses of 6mm, 8mm, 9mm, 11mm, 15mm, 18mm, 22mm, 25mm and 38mm. Boards are produced with either square or T&G edges.

OSB will not normally be attacked by wood boring insects, but panels made using aspen and spruce are susceptible to fungal attack under prolonged wet conditions, while OSB panels made from pine have moderate resistance to attack.

OSB can be cut by a hand saw or power saw and machined - bored, planed, routed and spindled, planed with normal woodworking machinery. Conventional woodworking fixings and techniques can be applied to OSB.

  • Ensure the joint parts are accurately machined.
  • Use sharp cutters to avoid tearing or burnishing the surfaces.
  • Use a high solids content adhesive with low flowing properties.
  • Mate the panels accurately and hold them under pressure while the adhesive sets.
  • Limit the width of grooves machined to about one-third of the thickness of the OSB. The depth of groove is typically about one-half of the panel thickness.
  • Allow adhesive-bonded joints to condition for several days before sanding and finishing.
  • Ensure the fit of the joints is not too tight to avoid a split along the edge.
  • Apply the glue liberally to both the tongue and the groove to ensure the entire joint is bonded.



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11mm Kronospan OSB3 - Moisture Resistant Oriented Strand Board - 2440mm x 1220mm

11mm Kronospan OSB3 - Moisture Resistant Oriented Strand Board - 2440mm x 1220mm

11mm x 2440mm x 1220mm - 2.98m2  Delivery Time: 1 - 2 days

A1-3361

11mm x 2440mm x 1220mm Kronospan OSB3 is a high performance board that provides dimensional stability and load bearing capabilities especially suited for use in humid conditions. It is manufactured using exterior grade formaldehyde-free resins and is a versatile, environmentally sustainable panel. O..

A1-3361
= m2
other sizes
11mm Smartply OSB FR Build - Flame Retardant Oriented Strand Board - 2397mm x 1197mm

11mm Smartply OSB FR Build - Flame Retardant Oriented Strand Board - 2397mm x 1197mm

11mm - 2397mm x 1197mm - 2.87m2  Delivery Time: 1 - 2 days

A1-3357

11mm x 2397mm x 1197mm Smartply OSB FR Build is a highly engineered, flame retardant load-bearing panel for use in timber frame buildings above 600 m2 total floor area. Zeroignition Solution, a water based, eco-friendly, flame retardant is added during panel processing ensuring fire performance whil..

A1-3357
= m2
other sizes
11mm Smartply OSB3 - Moisture Resistant Oriented Strand Board - 2397mm x 1197mm

11mm Smartply OSB3 - Moisture Resistant Oriented Strand Board - 2397mm x 1197mm

11mm - 2397mm x 1197mm - 2.87m2  Delivery Time: 1 - 2 days

A1-3329

11mm x 2397mm x 1197mm Smartply OSB3 is a highly engineered, moisture resistant load-bearing panel for use in humid conditions. It is manufactured to EN 300 performance standard and can be used for many structural -- roofing, flooring, wall sheathing -- and non-structural applications in both intern..

A1-3329
= m2
other sizes
18mm Smartply OSB3 Siteprotect - Moisture Resistant Oriented Strand Board - 2440mm x 1220mm

18mm Smartply OSB3 Siteprotect - Moisture Resistant Oriented Strand Board - 2440mm x 1220mm

18mm - 2440mm x 1220mm - 2.98m2  Delivery Time: 1 - 2 days

A1-3353

18mm x 2440mm x 1220mm Smartply Siteprotect is a highly engineered and improved moisture resistant OSB3 pre-primed panel for hoarding applications. It is coated with a smooth, heavy duty, cross-linked polymer primer. Smartply OSB3 Siteprotect is manufactured using only FSC certified timber, the..

A1-3353
= m2
18mm Smartply OSB3 TG4 - Moisture Resistant Tongue and Groove Oriented Strand Board - 2400mm x 600mm

18mm Smartply OSB3 TG4 - Moisture Resistant Tongue and Groove Oriented Strand Board - 2400mm x 600mm

18mm - 2400mm x 600mm - 1.44m2  Delivery Time: 1 - 2 days

Guide Price: £12.57 (£15.08 inc VAT)

£8.73/m2 (£10.48/m2 inc VAT)

A1-3347

18mm x 2400mm x 600mm Smartply OSB TG4 is a premium flooring panel with tongue & groove edges machined to the finest tolerance for a perfect fit and faces calibrated to a standard finished thickness. It is manufactured to EN 300 performance standard and is classified as a load-bearing panel..

Guide Price: £12.57 (£15.08 inc VAT)

£8.73/m2 (£10.48/m2 inc VAT)

A1-3347
= m2
other sizes
30mm Egger Flooring OSB HDX - T&G Oriented Strand Board - 2400mm x 675mm

30mm Egger Flooring OSB HDX - T&G Oriented Strand Board - 2400mm x 675mm

30mm - 2400mm x 675mm - 1.65m2  Delivery Time: 1 - 2 days

A1-3355

30mm x 2400mm x 675mm Egger Flooring OSB HDX is a heavy duty OSB4 panel suitable for load bearing environments, such as mezzanine flooring, racking, shelving, working platforms and decking and to be used in humid environments. It has a tongue and groove profile on the 2 long edges and 20% lighter th..

A1-3355
= m2
59mm Plydeck Xtratherm (PIR with OSB Board)

59mm Plydeck Xtratherm (PIR with OSB Board)

2400x1200 - 2.88m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £75.77 (£90.92 inc VAT)

£26.31/m2 (£31.57/m2 inc VAT)

show quantity discounts
A10-179
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

Xtratherm Plydeck is a composite insulated panel of Xtratherm Polyisocyanurate core with a composite foil face, bonded to 9mm OSB board. The Xtratherm Plydeck provides a high level of thermal insulation and decking in one application.APPLICATIONPlydeck is designed to provide high levels of thermal i..

Guide Price: £75.77 (£90.92 inc VAT)

£26.31/m2 (£31.57/m2 inc VAT)

show quantity discounts
A10-179
= m2
other thicknesses
9mm x 2397mm x 1197mm Smartply OSB3 Smartframe - Moisture Resistant Oriented Strand Board

9mm x 2397mm x 1197mm Smartply OSB3 Smartframe - Moisture Resistant Oriented Strand Board

9mm - 2397mm x 1197mm - 2.87m2  Delivery Time: 1 - 2 days

A1-3349

9mm x 2397mm x 1197mm Smartply OSB3 Smartframe is an OSB3 sheathing panel for load-bearing applications such as external walls, party walls, internal walls and partitions, gable panels, warm walls, reverse walls and Structural Insulated Panels (SIPs). It is specifically engineered to provide superio..

A1-3349
= m2
other sizes
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