"Make yourself an ark out of cypress wood, equip it with chambers and seal it inside and outside with pitch"
This is how a well-known story begins.
Also very early, around 1st millennium BC. In the 2nd book of the 10 books by Vitruvius (Marcus Vitruvius Pollio, engineer and architectural theorist), the importance of a differentiated wood selection is pointed out and all types of timber and their different properties are described: See translation:
"... The larch tree - Larix, .... Not subject to rot and worms alone because of the violent bitterness of its juice; but it also doesn't catch fire ... ... The oak, on the other hand. ... In underground works it is of immortal duration, and that's because it is not porous, and because of its dense nature, it cannot let in any moisture …. "
So a well-founded wood selection or wood treatment for the respective area of application has always been at the beginning of a project. Various types of wood are also used for OBRA playgrounds, depending on the application: e.g. pine, larch, robinia, oak, fir and ash.
What is the right wood for my playground?
First of all, the respective installation situation must be observed. These are also used in the standards in Use classes divided. A distinction must be made here, among other things, whether ...
- the individual component or the entire construction is under the roof and is therefore only exposed to temporary moisture,
- or an increased enrichment with water is to be expected,
- the wooden structure can dry quickly all around,
- the wooden structure is elevated,
- or the wood is in contact with the ground and therefore exposed to constant moisture.
Requirements for the material
In the case of playground equipment, there are also special loads on some components, such as abrasion from sand, gravel, shoes, play equipment or combinations thereof. In the case of components where children have direct contact with their hands on the wood when climbing, the wood properties with regard to splintering and cracking must also be observed. Additional requirements for the material can also have to do with the desired appearance, for example that colored glazes can penetrate the wood well.
The local wood species at OBRA:
Warehouse laths, fir tree
Impralit-KDS test certificate
The resin of the pine and its distillate was needed in early history to seal barrels and boats (see initial quote), which is why pine has always been specifically cultivated and used. However, only the heartwood has a high natural durability. In order to be able to use the sapwood, a technical wood protection process is used.
At OBRA Design, thicker dimensions of the jaw are stored for up to 12 months. The reason for this is the gentle and energy-saving air drying. For this purpose, the wood is stacked under the roof, depending on the wind direction, so that the air can circulate unhindered.
After the core-separated wood has been planed into round wood or other profiles, and the CNC beam has been carried out, the pine is impregnated in a 5-stage vacuum-pressure process, in which the tested and certified active ingredients, which are harmless for play equipment, penetrate the wood particularly well can penetrate. OBRA quality
At the end... Because even 12m long components can be impregnated and the splint can also be made permanently usable, pine, chrome-free, pressure-impregnated, is an ideal material for playground equipment of all sizes. The associated good use of resources and short transport routes are also to be rated positively. For example, Kiefer, kdi is used in the DURAMO product line, which is characterized by a 15-year guarantee.
37050 Pit sandpit
37300 Stage Duramo climbing device
The larch is native to the Alps, among other places. It has a high proportion of heartwood, can also be used without impregnation and thus represents a more ecological alternative . However, the natural durability class 3-4, which is assigned to European larch according to EN 350-2, contact with the ground should be avoided as much as possible.
At the end... Our larch is therefore ideal when it comes to using the wood in its natural state. Just as with pine, regional procurement and short transport routes are also beneficial for larch. OBRA Design also pays attention to constructive wood protection (elevation, no waterlogging) and organizational / structural wood protection (interchangeability of parts) for larch appliances.
Balancing climbing system made of robinia wood
Robinia, actually from America, but has been planted in many regions of Europe for 400 years, is peeled and sanded by hand without sapwood, since only the heartwood is very durable here. More precisely, the adult, extremely hard and tenacious heartwood of the Robinia is the only wood that grows in Europe which, according to EN 350-2, falls into resistance class I "very durable". This means that posts (posts) can also be installed in contact with the ground without an elevation. It should be noted here that a certain degree of cracking will occur, as the woods are usually naturally grown and are built along with the core. If wood has to be exchanged for this reason, there is additional work due to the lack of elevation and adjustment of the components on site.
At the end... If an adventurous or enchanted look is desired, then the robinia with its crooked trunks and branches as well as the changeable, mostly non-circular cross-sections, is the right choice. Especially when the natural habit of the robinia supports the play value of the equipment. Check out what Robin Wood has to offer:
If, on the other hand, you want to use the advantages of the modular system or appreciate the short transport routes for larch and pine, but still want to have a corresponding design language, our themed devices are available in the categories "Magic forest" or "Jungle" as an alternative to robinia.
Ash, oak, chestnut
Hardwoods such as ash or oak are used wherever a lot of abrasion is to be expected: for example on the rungs of ladders and steps. And chestnut? Yes, chestnut can be found together with oak in durability class II and is therefore one of the most durable indigenous woods. Look what you can do with the chestnut: Maze
Additional materials: steel, HPL, PE
For some components of playgrounds, an alternative to wood makes sense due to the most varied of requirements: With a slide (stainless steel, GRP or recyclable PE) or a swing joint, this is clear - but an HPL plate with anti-slip can also be used on a platform surface Surface make sense, especially when fall protection sand and water are "in play". Steel, on the other hand, is suitable for heavily loaded horizontal components with a long service life, especially if any cracks that may appear are not closed. See steel swing beams for group swings: OBRA-MAXI Nest Swing, steel / wood