The origin of each pur natur board

Douglas fir
Oak

Douglas fir

Native to Europe before the ice age

The Douglas fir genus was already growing in central Europe before the last ice age. Prehistoric findings and pollen analyses have made it possible to identify occurrences of the “Pseudotsuga” genus about 750 000 years ago.

Douglas fir in Europe

In 1830, the Scottish natural researcher and eponym “David Douglas” sent the first Douglas fir seeds of the “Pseudotsuga menziesii” genus from their North American habitat to Europe. In Europe, they first grew in forest gardens (arboretums) and were then later planted in forests. In 1831, the first Douglas fir plants reached Germany. The young Douglas fir plants were cultivated in the forest districts during this time. Relicts of the plantations of the time still constitute today the basic stock of the oldest Douglas firs in Germany. Regionally, the Douglas fir is also called the “Douglas pine” or “Douglas spruce”, although it does not belong to either of these types of tree.

Douglas fir in the Black Forest

In the Black Forest, there are large areas of old Douglas fir trees. Ruthard Männle, the founder of pur natur, concentrated on Douglas firs for more than 15 years and knows the best stocks in the Black Forest and beyond.

Oak

Early historic development of the oak

The genus of the oak “Quercus” comes from the beech family. The earliest literary reference is in the writings of the Roman author Quintus Ennius (239-169 B.C.). Pollen analysis research and plant fossil findings make it possible to conclude that the oak already existed before the ice age. The oak population starkly decreased in cold periods, and increased again in warm periods. As the spread of oaks depends on animals, this can only happen when a forest climate has already been created by other types of tree.

The oak in central Europe

The oak genus includes about 400 to 600 types, of which up to 450 in the subgenus “Cyclobalanopsis”. The German name (“Eiche”) is related to the Latin »esca« for feed, which points to the fact that acorns used to be of great significance for pig breeding.

In central Europe nowadays, the common oak (Quercus robur) and the sessile oak (Quercus petraea) are the most commonly represented. Whereas the sessile oak prefers dryer locations, the common oak mostly grows in damper environments such as river plains.

 

Profile

20.12.2017
Douglas fir  
Species Pseudotsuga menziesii
Family Pines
Origin North Amerika
Growth height up to 65m
Crown slim and conical, in old age rather erratic
Bark lengthways sulcate, in old age very thick
Wood value 1,2,3
Withstanding of frost –16°C bis –24°C
Sex Unisex

Mit der Veröffentlichung dieses Produktdatenblattes verlieren alle vorherigen Versionen ihre Gültigkeit.
Technische Änderungen, Fehler und Irrtümer vorbehalten.

20.12.2017
Oak  
Species Quercus robur
Family Beech family
Origin Central Europe
Growth Height bis 25m
Leaf structure alternate, ovate, leaf margin sinuate
Type of fruit Nut fruit
Wood value 1,2,3,5
Withstanding of frost –24°C to –28°C
Sex unisex

Mit der Veröffentlichung dieses Produktdatenblattes verlieren alle vorherigen Versionen ihre Gültigkeit.
Technische Änderungen, Fehler und Irrtümer vorbehalten.

Here are explanations for the most important terms around the topic of floorboards:

Additional length

When ordering 5m-long boards, they are not cut exactly to 5.00m. You will receive boards measuring approx. 5.05m, i.e. including a cost-free additional length of about 5cm. It can thus be decided which side to shorten when laying.

Backing

The backing designates the underside of a 3-layer board. It mostly consists of the same or similar wood to the surface layer.

Boards

Boards refer to the various elements of a wooden flooring. Boards are available in many different sizes. Boards are further differentiated according to intended use (interior or exterior) and construction type (solid or 3-layer).

Bowing

In terrace construction, bowing designates the effect where boards bend upwards at the sides. This gives a U shape or bowl shape. The causes for bowing may be the boards being dry on the top side and becoming damp on the underside due to lacking ventilation. Bowing is to be expected especially for boards with large widths in exterior spaces.

Butt log

When buying round timber, a tree trunk is divided into different segments or parts. These are, from bottom to top: main truck, secondary lengths and tertiary lengths.

Construction types

pur natur boards are available in the construction types 3-layer or solid. 3-layer boards consist of three glued layers of wood (top layer, middle layer and backing). Solid boards are sawn from one piece of wood.

Douglas fir

The Douglas fir is the hardest native conifers. Douglas fir wood can be used for interior as well as exterior areas. Untreated, Douglas fir is light to rosé-coloured. Oils, lye and soap can create various different appearances. In exterior spaces, Douglas fir is very resistant and builds up a silver-grey patina over time.

English pattern

Boards in defined lengths are laid adjacently. The English pattern is a traditional pattern and is perfectly suited to long rooms. For a timeless, classic look.

Fine-grained

Depending on the location and the soil, a tree may present wider or narrower age rings. The width of age rings indicates how fast a tree has grown. Boards have a fine-grained structure, i.e. narrow age rings, when the tree grew slowly.

Flame figures

Flame figures designate a particular pattern in the wood that occurs when the round wood is cut in parallel to the trunk axis. The boards then present figures of U or V-shaped darker grain in the wood.

Full covering

Full covering designates the use of boards not just for the floor, but also for walls and/or ceilings.

 

Full length

Full length boards are as long as the room and can thus be laid without joints. pur natur Douglas fir boards are available in lengths up to 15m, oak boards in lengths up to 11m.

Grain

The grain of a trunk designates the appearance of its characteristics such a sage ring structure, knot frequency and wood colour.

Herringbone

The herringbone pattern is a traditional design. The boards are laid at right angles to each other. This gives classic, unusual floor designs.

Horizontal age rings

Horizontal age rings are age rings that appear as U shapes on the end faces of the boards.

Invisible screwing

Invisible screwing designates a way of mounting the boards without visible screws on the top side. The advantages of this are a smoother appearance and that the top side of the boards is not damages by drill holes.

Length interval

pur natur boards are produced in various lengths. For a 4.90m-long room, boards of the closest length category, for example 5.00 m (+approx. 5cm cost-free extra length) are delivered. The boards are then cut down to the exact size when they are laid.

Linseed oil

To treat your Douglas fir boards surface, linseed-oil-based colours can also be used. Linseed oil colours are completely natural and create very pretty surfaces. Download PDF about surfaces

Lye

Treatment with wood lye is a type of surface treatment of pur natur boards. pur natur wood lye is available with and without white pigments. In exterior spaces, wood lye works as a natural, additional protection and gives a consistent, silver-grey patina. In interior spaces, a treatment with wood lye lightens the floorboards and can be used in combination with soap or oil. Information about surface treatment

Middle layer

The middle layer designates the middle layer of a three-layer board. It usually consists of spruce or pine wood.

Multilayer boards

Multilayer boards, also called 3-layer boards or parquet boards, consist of three glued layers of wood: a surface layer (use layer), a middle layer and a cross layer. pur natur three-layer boards are available with a minimum thickness of 16mm.

Natur

pur natur boards are available in the sorts “Select” and “Natur”. Boards of the Natur sort are characterised by natural knots and wood structure. Rooms with Natur boards thus give an impression of living, casual comfort.

Oak

Oak wood (lat. quercus) in the interior is characterised by hardness and durability, and can therefore also be implemented in public buildings. Oak wood is mostly red-brown, but it can also tend towards yellow or green. Oak wood is less well-suited to the exterior.

Oil

A surface treatment with oil makes a floor particularly hard-wearing and durable. Oils can also give various different appearances (light, dark, coloured). Information about surface treatment

Parquet floorboard

Parquet floorboard, also called 3-layer boards or parquet boards, consist of three glued layers of wood: a surface layer (use layer), a middle layer and a cross layer. pur natur three-layer boards are available with a minimum thickness of 16mm.

Patina

With time, wood in exterior spaces becomes grey. To achieve a consistent, silver-grey patina, a surface treatment with wood lye is recommended.

Pseudotsuga

“Pseudotsuga” is the Latin name for the Douglas fir genus. The sub-genus “Pseudotsuga menziesii” is also widely present in Europe. Douglas fir wood is one of the hardest native conifers and can thus be used in interior as well as exterior spaces.

Quercus

Quercus is the Latin name for the oak sub-genus. In central Europe nowadays, the common oak (Quercus robur) and the sessile oak (Quercus petraea) are the most commonly represented. For the production of pur natur boards, especially the common oak (Quercus robur) is used.

Random length

For random lengths, we deliver boards of all lengths within a certain interval. This allows for the maximum to be gained from the high-quality wood. Varying lengths connects rooms together seamlessly.

Relief groove

As of a certain width, in solid boards a notch, or relief groove, is milled into the underside. Relief grooves can reduce tension in solid wood boards.

Rift cut

The rift cut designates a special cutting procedure. The round timber is hereby cut so that the boards present half-vertical age rings. Boards that are sawn with the rift cut procedure present a very good quality and minimal cracks at the most.

Sawn veneer

Sawn veneer designates wooden sheets that are usually 2 – 10mm thick. As the production of sawn veneer implies approx. 50% material loss, the production of sawn veneer is considered very expensive and cost-intensive. Sawn veneer is especially used in furniture construction.

Secondary lengths

When buying round timber, a tree trunk is divided into different segments or parts. These are, from bottom to top: main truck, secondary lengths, tertiary lengths.

Select

pur natur boards are available in the sorts “Select” and “Natur”. The “Select” sort is characterised by smaller and fewer knots and a fine-grained structure. This gives rooms an elegant and calm effect.

Sharp-edged

Boards are called sharp-edged when the top edges present a 90-degree angle. Sharp edges give a flat appearance. Boards are also often laid with bevelled (broken) edges or rounded edges. Then joints become more apparent.

Soap

For the treatment and care of pur natur floorboards in interior and exterior spaces, a special wooden flooring soap can be used. The wooden flooring soap is available plain and white. Information about surface treatment

Solid boards

Solid boards designate boards that are cut from one piece of wood and are thus not glued or screwed. Solid boards are the most natural form of a wooden board flooring and are available in Douglas fir or oak wood.

Sorts

According to the appearance of the wood grain, boards are grouped into different sorts. At pur natur, these are the “Select” and “Natur” sorts. The “Select” sort has a very calm effect, as it has a tight wood grain and fewer knots. In comparison, the “Natur” sort has larger and more frequent knots and thereby has a more natural and lively effect.

Substructure

To fasten terrace boards, a substructure is necessary. This is laid crosswise to the boards. Depending on the situation, a substructure in wood or aluminium can be recommended.

Contact terrace expert now

Terrace plank brackets

Invisible screwing designates a way of mounting the boards without visible screws on the top side. The advantages of this are a smoother appearance and that the top side of the boards is not damages by drill holes.

Tertiary lengths

When buying round timber, a tree trunk is divided into different segments or parts. These are, from bottom to top: main truck, secondary lengths and tertiary lengths.

Three-layer boards

A three-layer board, also called multilayer or parquet board, consists of three glued layers of wood: a top layer (use layer), a middle layer and a backing. pur natur three-layer boards are available with a minimum thickness of 16mm.

Top layer

The top layer (ore use surface) is the topmost and therefore visible layer of 3-layer boards. The thickness of the surface layer of pur natur Douglas fir 3-layer boards is of 6.2mm or 5mm, depending on the total thickness. Oak 3-layer boards have a 5mm-thick top layer.

Vertical age rings

Vertical age rings occur when the round timber is sawn with the rift cut procedure. The age rings thus appear vertical, i.e. as lines that run in parallel to the board.

Visible joints

As of a certain width, it is recommended to lay boards with visible joints, i.e. of approx. 2mm between the boards. The visible joints underline the linear appearance of long and wide boards and allows each individual board to move.