Wood as far as the eye can see

A wooden decking doesn't just look good. The particularly natural and proven building material also has many physical advantages and is particularly environmentally friendly.

A wooden decking is technically uncomplicated and can be built in the shortest possible time. Properly installed, the wooden decking is insensitive to rain and frost. Built above the ground or the lawn, the ground under the decking can continue to store and release rainwater unhindered. The CO2 absorbed in the wood used during its time as a tree remains stored in it for the entire lifetime of the decking. In the event of combustion, it is released in a climate-neutral manner.

For decking construction, builders, planners and architects can choose from a wide range of attractive types of wood and technically modified woods such as thermowood and kebony. Wood connoisseurs know: Real wood is a natural material and changes its natural colour over the years. The result is a grey to silvery patina, which for many wood lovers additionally underlines the actual beauty of the wood.

 

By the way, modified woods and NFC/WPC composites are not natural woods, and they should only be processed according to the manufacturer's instructions because of their different material behavior!

Which plank is the right one? Depending on the area of application, a more or less intensive weathering and different mechanical stresses of the wooden decking can be assumed. Therefore, in addition to the appearance, the different material properties from type of wood to type of wood also count. SPAX wood science provides a practical overview of popular wood types and their properties. With his help, nothing can go wrong with the plank decision!

 

Please note: For special cases such as roof deckings or walkways, building permits as well as compliance with special material standards and maintenance regulations may be required. If necessary, consult an architect or structural engineer!

Douglas

All-rounder with American roots: Originating from North America, Douglas fir has also been cultivated in Europe for over 100 years. The good processability, high resistance and last but not least the low distortion make the Douglas fir a particularly popular wood for outdoor use. Astreichtum and the decorative alternation of sapwood and heartwood give wooden decking planks made of Douglas fir a lively appearance.

 

If heavy weathering and moisture are involved, wood protection measures in the form of oiling or glazing are recommended. Iron nails lead to blackish "bleeding" - so it is essential to use SPAX plank screws in stainless steel quality!

 

Nevertheless, the Douglas fir is a particularly uncomplicated wood. With glazes, stains and paintings, the wood can be brought into shape in no time at all. Apart from that, the coatings not only extend the use and service life of the decking: they also open up a wide range of possibilities to set creative accents!

 


Botanical name: Pseudotsuga menzielii

 


Abbreviation according to DIN EN 13556: PSMN

 


Heritage/Origin: Europe

 


Bulk density at 12-15% wood moisture: 470 – 520 kg/m3

 


Hardness (Brinell) N/mm²: 17-30

 


Durability according to DIN EN 350: DKL 3-4 

 


Color treatment: Quite possible (recommended)

 


Knottiness: Fine to coarse / star-shaped torn

 


Shrinkage and swelling: high

 


Twist growth / distortion: low

 


discolouring wood ingredients: none known

 


Resinous content medium

 


Iron tannin reaction: low

 


Tendency to crack: medium

 


Processability: good

 


Safety-relevant function: yes in GKL 3.1

 


Remarks: The sapwood content is > 10-20% and must be taken into account for load-bearing structures.

 

European larch

Charming European: The European larch is similar to the Douglas fir and is therefore often confused with it. Since the European larch mostly comes from fast-growing crops, its wood is coarser and of less hardness than that of its Siberian namesake. The quality of larch wood from mountainous high altitudes is higher than that of larch wood from lowland locations.

 

Because of the larch-typical coloration, colorless glazes are preferably used for a protective treatment. However, highly resinous areas must be treated with special resin solvents before applying the glaze. Or you simply leave the wood untreated, then there is no need for concerns about the relatively high tannic acid content.

 

By the way, the generally high resin content makes larch wood particularly resistant to acids. Since the larch only plays in the middle and lower league in terms of hardness, it should not be exposed to extreme weathering.

 


Botanical name: Larix decidua.

 


Abbreviation according to DIN EN 13556: LADC

 


Heritage/Origin: Europe

 


Bulk density at 12-15% wood moisture: 470 – 650 kg/m3

 


Hardness (Brinell) N/mm²: 19-25

 


Durability according to DIN EN 350: DKL 3-4 

 


Colour treatment: conditionally possible (note manufacturer's information)

 


Knottiness: Fine to coarse

 


Shrinkage and sources: medium

 


Twist growth / distortion: medium

 


discolouring wood ingredients: none known

 


Resin content medium to high

 


Iron tannin reaction: low

 


Tendency to crack: high

 


Processability: good

 


Safety-relevant function: yes in GKL 3.1

 


Remarks: Larch is difficult to treat in colour due to its high resin content and should under no circumstances be treated with dark pigmented glazes.

 

Siberian larch

Robust with cold plus: In Russia's north, icy temperatures prevail for many months. Summers are short and hot. These climatic conditions lead to slow-fine-year & predominantly knot-free growth. In contrast to the European larch, the Siberian representative therefore provides a hard softwood with good processing properties.

 

For a coat of paint, only colorless or slightly pigmented glaze coatings should be used because of the holly, attractive coloring and structure. They are the best way to emphasize the wooden image. Before painting, as with European larch, a check must be carried out for any resin nests and their pre-treatment by special resin dissolvers.

 

If you are looking for a robust wood of attractive grain and colour, you can't go wrong with the Siberian larch!


Botanical name: Larix sibirica

 


Abbreviation according to DIN EN 13556: LAGM

 


Heritage/Origin: Siberia

 


Bulk density at 12-15% wood moisture: 680 – 700 kg/m3

 


Hardness (Brinell) N/mm²: 19-25

 


Durability according to DIN EN 350: DKL 3-4 / > 700 kg DKL 3 

 


Colour treatment: conditionally possible (note manufacturer's information)

 


Knottiness: Fine to coarse

 


Shrinkage and swelling: medium - high

 


Twist growth / distortion: medium to strong

 


discolouring wood ingredients: none known

 


Resin content medium to high

 


Iron tannin reaction: low

 


Tendency to crack: high

 


Processability: good

 


Safety-relevant function: yes in GKL 3.1

 


Remarks: Larch is difficult to treat in colour due to its high resin content. The Siberian larch is usually very fine and grows very slowly compared to the European larch.

 

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