Thermo spruce

Origin	Central Europe; thermally modified spruce
Raw density	approx. 430-500 kg/m³, slightly reduced by heat treatment
Durability class	Class 2
Radial shrinkage	reduced by thermomodification
Tangential shrinkage	significantly reduced
Wood color	golden brown to dark brown, later graying
Wood structure	fine-grained, soft, more brittle due to treatment
Use	Terraces, facades, lightweight exterior constructions, furniture

Origin and character of the wood

Thermofichte is based on domestic spruce spruce – a common tree species in Europe, but one that is under increasing ecological pressure. The thermal treatment changes the cell structure, reduces resin and improves moisture resistance. Nevertheless, the typical weaknesses of the material remain, as spruce is a soft and mechanically limited wood.

Heat treatment: improvements with clear limits

The modification increases dimensional stability and biological resistance and leads to a classification in durability class 2. At the same time, it makes the wood more brittle. Experience reports regularly mention cracking, screws pulling out and reduced bending strength.

Sustainability: advantageous, but not automatically ecological

Thermo spruce is considered a sustainable option as it does not require chemicals and comes from local forests. The high energy input of thermal treatment and the ecological problems of spruce-heavy monocultures put this advantage into perspective. The actual lifespan depends heavily on construction and maintenance.

Sources: Filzgleiter – Thermoholz vs. tropical wood,
Arbor Holz, Gartenhaus Magazin, Seca, Haus.de – Thermoholz

Garapa decking boards finger-jointed 145mm

ab 9,80 €

Garapa decking boards, FSC 100%
Price from: € 65 per m2, resistance class: 1-2

Advantages: ✓ smooth surface ✓ homogeneous, light color

Disadvantages: ✗ Ferrous materials lead to discoloration ✗ Tendency to warp if not screwed down

Tip: patio cleaning removes discoloration and
professional interim storage prevents warping.

Teak decking boards 125mm

ab 6,90 €

Teak decking boards, FSC 100%
Price from: € 130 per m2, resistance class: 1

Advantages: ✓ Best durability and dimensional stability ✓ Lowest risk of cracking and splintering

Disadvantages: ✗ Relatively expensive ✗ Not very long planks

Tip: Lay decking boards together.

Cumaru decking boards 145mm

ab 11,85 €

Cumaru decking boards, FSC 100%
Price from: € 70 per m2, resistance class: 1

Advantages: ✓ best durability ✓ particularly robust and scratch-resistant

Disadvantages: ✗ Partly rough surface ✗ High force development

Tip: Sand the boards after the first weathering.