Green Oak Beams & Posts | Structural Oak Beams | UK Timber

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Green Oak Beams & Posts | Structural Oak Beams | UK Timber

Structural Green Oak Beams & Posts

Our structural green oak beams are green (fresh sawn) European oak (Quercus robur), cut at our own sawmill in Corby. Green oak is unseasoned, so it is easier to cut and joint than dried oak. That makes it the traditional choice for oak frames, porches, pergolas, garages and gazebos. As the frame dries the oak shrinks, which tightens pegged joints.

Choose a standard section size: 100mm x 100mm, 150mm x 150mm, 175mm x 175mm, 200mm x 150mm, 200mm x 200mm, 225mm x 225mm, 250mm x 150mm, 250mm x 250mm or 300mm x 300mm, in standard lengths from 2.4m to 12m. Prices start from £35.49 ex VAT. If you need something else, use our custom cut green oak beams tool to order any size. Beams are cut to QP1 standard, and our on-site TRADA-qualified graders can grade to THA (D40) or THB (D30) for an extra charge. FSC/PEFC certified green oak beams are available on request. We deliver across the UK in up to 10 working days, with no length or weight limits, or you can collect from Corby.

  • Custom Cut Green Oak Beams
    Custom Cut Green Oak Beams
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    Popular uses. Green oak posts and beams are used for oak framed porches, pergolas, oak frame houses, garages, carports and gazebos. Add an Oak Curved Wind Brace for bracing, and set posts on Staddle Stone Post Bases. Peg the joints with oak dowels.

    See our Customer Project Gallery for projects built with our green oak beams.

    Making a mantel or working indoors? Use air dried oak, which moves far less than green (fresh sawn) oak. Order it to size with our air dried oak beams calculator.

    Need it planed? Planed all round (PAR) beams are available through the custom cut PAR oak beams tool. Planing removes up to 6mm from the width and thickness, so a PAR beam finishes up to 6mm smaller than its sawn size.

    FAQ

    What sizes do you stock?

    We stock nine square and rectangular sections from 100mm x 100mm to 300mm x 300mm, in standard lengths from 2.4m to 12m, from £35.49 ex VAT. Any other size can be custom cut.

    Is green oak the same as fresh sawn oak?

    Yes. Green oak and fresh sawn oak are two names for the same thing: oak that is cut and supplied without being dried first. Air dried oak is different: it has been left to dry before sale, so it moves less, which is why we recommend it for mantels and indoor work.

    Will my beam be the exact length?

    No. Beams are cut longer than required, to be trimmed to length on site.

    Will green oak move and shrink?

    Yes. Green oak has a high moisture content and dries slowly after it is cut. As it dries it shrinks and may twist, check (split along the grain) and form shakes. Shrinkage varies a lot, but green oak can shrink by as much as 10% tangentially (across the grain) and negligibly along its length. This is normal for green oak. Design joints and fixings to allow for this movement.

    Can I use green oak for a mantel?

    We recommend air dried oak for mantels, not green (fresh sawn) oak, because it moves less indoors. Use our air dried oak beams calculator.

    What is green oak used for?

    Green oak is used for oak frames, porches, pergolas, posts, columns, garages and gazebos. Try our pergola configurator, or browse pergola components and porch kits.

    Can you cut a custom size?

    Yes. We cut green oak to any size, from single beams to full loads, on our own machines in Corby. Order through custom cut green oak beams or see our custom cutting services.

    How much does planing remove?

    Planing (PAR) removes up to 6mm in width and thickness, on every size.

    What grade is the oak?

    The oak is QP1 European oak with a minimum of three straight edges and a small amount of wane allowed on one edge. Our TRADA-qualified graders can grade to THA (D40) or THB (D30) structural standards for an extra charge.

    How is it delivered?

    We deliver UK-wide in up to 10 working days, with no length or weight limits, or you can collect from Corby.

    Is it certified?

    Yes. UK Timber is FSC and PEFC certified, and FSC/PEFC certified green oak beams are available on request.