Timber selection determines more about a finished piece of furniture than any other single decision: how it responds to cutting tools, how much it moves seasonally, how it accepts finish, and how long it lasts under use. The choice begins not with aesthetics but with function — what the piece needs to do — and then narrows based on availability and budget.
Hardness and Density
Wood hardness is often expressed using the Janka scale, which measures the force required to embed a steel ball to half its diameter. Higher Janka values indicate greater resistance to wear and denting. For furniture, hardness matters most in horizontal surfaces that receive daily contact: tabletops, seat rails, worktops.
Common species available in Poland, with approximate Janka ratings:
- Oak (Quercus robur): ~6,000 N — hard, stable, widely available from domestic sawmills.
- Beech (Fagus sylvatica): ~6,600 N — harder than oak, uniform grain, bends well with steam.
- Ash (Fraxinus excelsior): ~5,900 N — strong, excellent shock resistance, prominent straight grain.
- Walnut (Juglans regia): ~4,500 N — softer than oak, works beautifully, takes finish very well.
- Cherry (Prunus avium): ~4,200 N — fine grain, darkens attractively with light over years.
- Pine (Pinus sylvestris): ~1,600–2,200 N — soft, inexpensive, widely available, prone to denting.
Reference: Janka hardness test — Wikipedia
Oak
European oak (Quercus robur and Quercus petraea) is the most commonly used hardwood in Polish furniture construction. It is domestically grown, readily available from sawmills in standard thicknesses, and machines and hand-tools well. Quartersawn oak — where the growth rings run roughly perpendicular to the face — displays characteristic medullary ray fleck, is more dimensionally stable, and is the traditional choice for panel work.
Oak is open-grained (ring-porous), meaning the large pores of the early wood are visible and require a grain filler before applying a film finish if a perfectly smooth surface is desired. Oil finishes — linseed, tung, or hardwax-oil — work well on oak without filling.
Tannins in oak react with iron: contact with steel tools left wet will produce black staining in the wood surface. Waterstone slurry on freshly planed oak shows this immediately. Wipe tools dry and keep ferrous hardware away from unfinished oak surfaces.
Pine
Scots pine (Pinus sylvestris) is the most widely available timber in Poland. It is inexpensive, light, and easy to work — but it dents. A tabletop in pine will show every dropped object and pressed key within months of use. This does not make pine inappropriate for furniture; it makes it appropriate for furniture where a worn, marked surface is acceptable — kitchen shelving, workshop benches, painted case pieces.
Pine's resin content varies considerably between pieces. High-resin areas (around knots, or in heartwood from slow-grown trees) bleed resin through paint or varnish over time unless sealed with shellac first. Kiln-dried pine from a reliable supplier is preferable to air-dried, which may retain enough moisture to continue shrinking after construction.
Walnut
European walnut (Juglans regia) and its American counterpart (Juglans nigra) are both used in Polish fine furniture, though American walnut is typically imported and more expensive. European walnut grows in southern Poland and surrounding regions and has a warmer, lighter brown tone compared to the chocolate-grey of American black walnut.
Walnut works easily with hand tools and takes sharp edges cleanly. Its interlocked grain — a characteristic of many walnut logs — can tear out if planed in the wrong direction. Tracking the grain direction by observing which way the fibres slope on the face of the board before starting a cut prevents most tear-out problems.
Moisture Content and Movement
Wood shrinks and expands across its width (tangentially and radially) as moisture content changes with ambient humidity. It does not move significantly along its length. In Poland, indoor equilibrium moisture content typically ranges from about 8% in winter (dry central heating) to 13–15% in summer (higher outdoor humidity). A board 300 mm wide in oak can move 4–6 mm across that range.
This movement must be designed into the furniture. Wide tabletops need to be fixed to their bases with buttons, figure-8 fasteners, or Z-clips — not screwed rigidly. Frame-and-panel construction accommodates panel movement by floating the panel unglued in its groove. Ignoring wood movement is the most common reason older furniture cracks.
Buying timber that is already at the equilibrium moisture content of its destination — the room the furniture will live in — reduces movement after construction. A moisture meter is a worthwhile investment for anyone building regularly. The target for indoor furniture in Poland: 8–12% moisture content at purchase.
Local Availability in Poland
Oak and pine are sourced domestically from sawmills in the Mazowieckie, Podlaskie, and Warmia-Mazury regions, among others. Beech and ash are common in the Carpathian foothills and the Sudetes area. Walnut is available from specialist timber merchants in larger cities.
Buying direct from a sawmill allows selection of specific boards and thicknesses rather than accepting whatever is pre-cut. Most sawmills in Poland sell to individuals, particularly if purchasing a reasonable quantity. The National Forests authority (Lasy Państwowe) operates timber auctions that some woodworkers use for larger purchases.
Reference: Lasy Państwowe — Poland's State Forests
Summary Comparison
No single species suits every application. A reasonable framework:
- High-wear surfaces (tabletops, worktops): oak, beech, or ash.
- Fine joinery, drawer sides: oak (quartersawn), cherry, or walnut.
- Bent components (chair backs, curved rails): beech or ash (steam-bends well).
- Painted case furniture: pine (cost-effective, stable when dry).
- Decorative veneered panels: walnut or cherry for the face; stable substrate (MDF or plywood) beneath.