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What is the difference between planed and fine-sawn timber?

The Wood Guide · Reference

Reference

Planed or fine-sawn?

Two boards from the same tree, with the same name and the same nominal size — but not the same dimensions, not the same price and not the same use.

  • Planed is smaller
  • Fine-sawn is rougher
  • Nominal size ≠ actual size
processing
Rough-sawn surface with visible saw marks (Prunus avium)
Rough-sawn surface with visible saw marksPrunus avium
Four-sided planing machine with freshly planed battens
Four-sided planing machine with freshly planed battens
In pictures · Planed or fine-sawn?1 / 6
Chapter 1 · The species

Planed or fine-sawn?

Two boards from the same tree, with the same name and the same nominal size — but not the same dimensions, not the same price and not the same use.

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Summary

The same wood, a different finish

The difference is not in the tree but in what happened to it after sawing.

Fine-sawn timber comes straight off the saw. The surface is rough, with visible saw marks, and the dimensions are the sawn dimensions. It is cheaper, and that rough texture absorbs stain and preservative better than a smooth surface — which is why it is the usual garden timber for fences and structures.

Planed timber has gone through a planing machine after sawing. Four smooth faces, usually with slightly rounded edges. It is more pleasant to touch, more dimensionally accurate and ready to finish. The price is higher, and it is the logical choice for anything you touch or see up close.

What surprises people most is the size. A beam sold as 45 × 70 mm but planed often actually measures 42 × 67 or thereabouts: planing removes material from every side. Fine-sawn timber is closer to the stated size.

Always measure it yourself

The sizes in a price list are nominal sizes, and how much comes off in planing differs from supplier to supplier. Measure one piece before you draw up your construction — a difference of three millimetres per part adds up quickly in a four-part frame.

Fine-sawn
rough, saw marks visible, sawn size
Planed
four smooth faces, more accurate, smaller
Price
planed is higher
Stain and preservative
soak in better on fine-sawn timber
Splinters
fine-sawn gives more
Nominal size
applies before planing
Planed all round
often abbreviated to 'planed 4 sides'

Fair is fair: planed timber is not automatically better. It is more expensive, it absorbs stain less deeply, and on large outdoor surfaces it turns grey just as quickly. For a fence you are going to stain anyway, or for structural work that stays out of sight, planed timber means paying for a smoothness nobody will ever feel.

Side by side

The two side by side

Fine-sawn

Straight off the saw

The usual garden and construction timber.

  • Cheaper per metre
  • Rough texture absorbs stain deeply
  • Closer to the stated size
  • Splinters when touched
  • Saw marks remain visible under the stain
Planed

Four smooth faces

For anything you touch or see up close.

  • Pleasant to handle
  • More accurate and straighter
  • Ready to varnish or oil
  • More expensive
  • Actual size smaller than nominal
What goes where

What to choose for what

Use Choice Why
Fence posts and boards fine-sawn cheaper, and stain soaks in better
Structural timber out of sight fine-sawn nobody sees or feels it
Garden furniture planed you sit on it; splinters are no detail here
Decking boards planed or profiled bare feet; and a profile adds slip resistance
Interior finishing planed ready to varnish or oil
Decks and jetties planed or grooved safety before price
Rustic look fine-sawn the saw texture is the effect here
And 'dried'?

Besides the finish, there is often something about the moisture content too: freshly sawn, air-dried or kiln-dried. That is a separate property. Fresh timber still shrinks considerably after delivery — for precision work, choose dried material, whether it is planed or not.

When buying

What to look out for

Measure one piece

Compare the actual size with the nominal size, and calculate with that. The difference comes back in every calculation.

Sight along the board

You only see bow and twist by looking along the length. Planed timber is usually straighter, but not automatically straight.

Check the edges

Planed timber usually has slightly rounded edges. That helps with finishing and it feels better.

Cutting it yourself?

Every cut face you make yourself is untreated wood — even with pressure-treated material. Treat those faces afterwards.

Feel free to combine

Fine-sawn for the structure, planed for what you touch. That is the usual and the cheapest combination.

You can plane it yourself

With a planing machine you can turn fine-sawn timber into planed timber. Expect material loss and dust — and time.

Quick answer

Frequently asked questions about planed and fine-sawn timber

What is the difference between planed and fine-sawn?

Fine-sawn timber comes straight off the saw and is rough; planed timber has then been planed flat on four sides. Same tree, different finish.

Why is my planed beam smaller than the stated size?

Because the stated size is the nominal size, from before planing. Planing removes material from each side — so always measure one piece.

Which is better for outdoors?

That depends on where it goes. For fences and structural work, fine-sawn is usual and cheaper; for anything you touch — furniture, decking, handrails — choose planed.

Does stain soak in better on fine-sawn timber?

Yes. The rough texture absorbs more and holds the product better. On smooth planed timber the layer stays more on the surface.

Can I plane fine-sawn timber myself?

Yes, with a planing machine. Expect material loss, a lot of dust and a fair amount of time — worth it for small quantities, rarely for large ones.

What does 'dried' mean on a price list?

That is about the moisture content, not the finish. Freshly sawn timber still shrinks considerably after delivery; for precision work, use kiln-dried material.

More in The Wood Guide

More in The Wood Guide

From sizing to species: what you need to know before you order.

The Wood Guide What is a timber merchant? Do it yourself

Have a question about your project? Just ask — we're happy to help.

Photos via Wikimedia Commons: Prunus avium — Dietmar Rabich, CC BY-SA 4.0 · Four-sided planing machine with freshly planed battens — Zesa, CC BY-SA 3.0

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