Stevens

Pine (redwood)

The photographs of the wood species are solely illustrative and may differ from reality.

General
  • light brown to reddish-brown or yellow heartwood, white to yellowish white sapwood
  • one of the most commonly used wood species
  • suitable for interior and exterior (when preserved)
  • moderately to not very durable wood

Origin

Redwood (pine) is the commercial name for Pinus sylvestris. Most pine types come from the northern hemisphere. They are also however, found in Chile, Brazil, South Africa, New Zealand and Central and Southern Europe for example.

spruce

Appearance

The branches grow in whorls around the trunk. The growth zone is extremely widespread: dimensions and qualities therefore vary considerably. The tree grows to a height of around 35 metres, with a diameter of between 30 and 50 cm. The trunk is straight and cylindrical and free of branches up to approximately 10 metres.

Colour and figures

The colour of the fresh heartwood is light brown. In time, it becomes darker and then varies between yellowish-brown and reddish-brown, contrasting sharply with the 50-100 mm wide sapwood, which can be white to light yellow in colour. The sapwood can sometimes be slightly darker than normal, generally in isolated patches. This is due to the presence of pressure wood (reaction wood), which should be seen as a natural defect. This defect is not noticeable in the heartwood. Like other pine woods from the temperate zones, Redwood (pine) exhibits a clear difference between the light-coloured early wood and the darker-coloured late wood. Vertical grain sawn wood produces a striped figure and a flame figure appears on flat grain wood. Redwood (pine) is resinous. The resin ducts can sometimes be seen as extremely fine stripes. There are sometimes noticeable dark-brown, irregularly-formed sticky patches on the longitudinal planes.  
Freshly sawn or planed wood exudes a pleasant resin or turpentine scent. This scent disappears in time, but when old wood is worked again, it smells like new. Redwood (pine) from plantations contains a high percentage of sapwood, as the pine trees only form heartwood after around 25 years. Research has shown that the mechanical characteristics of Redwood (pine) sapwood are no less than those for heartwood. European Redwood (pine) has an extremely large growth zone, with highly varying climatological conditions. Consequentially, there is a wide variation in growth ring width, volumic mass, cell size, cell wall thickness and the number and size of knots.

Durability

The heartwood is moderately to not very durable (natural durability class III –IV), the sapwood is not durable (natural durability class V).

Quality

Imported sawn timber is graded by appearance. Depending on the origin, different grading regulations apply.

Pine from Sweden and Finland
Belgium respects the ‘Nordic timber: grading rules for sawn pine and spruce’, also known as the ‘Scandinavian green book’. This distinguishes six quality classes (from I to VI). ‘Unsorted’ timber includes classes I, II, III and IV. Sweden and Finland also use the ‘Sawfalling’ quality indication. This consists partly of ‘Unsorted’ timber, partly Class V sawn timber and up to 20% as a limited proportion of Class VI sawn timber.

Pine from Russia
The Russians distinguish between five quality classes. ‘Unsorted’ wood includes classes I, II, and III. Their fourth class corresponds with the saw-falling quality of the Scandinavian countries and their fifth with the sixth quality of the Scandinavian countries.

Pine from the Baltic States, Poland and the Czech Republic
The Baltic States, Poland and the Czech Republic export a Sawfalling quality that corresponds closely with that from the Scandinavian countries.

STS 04 determines the regulations for visual strength grading. As of 1 September 2009, NBN EN 14081 is the reference for CE marking for construction wood.

Drying and Moisture Content

Freshly-sawn wood should be dried quickly to below 20% to prevent blue mould and rot. Redwood (pine) dries well and quickly, but there is still some risk of splitting or discoloration at high temperatures.

Wood-working and treatment

Redwood (pine) is highly suitable for drilling, milling, sanding, nailing, screwing and gluing.  The resin sometimes sticks to the cutters, the answer is to degrease regularly.  If the wood has a low moisture content, then adjust the planing speed to prevent knots jumping out. The heartwood is difficult to preserve, but the sapwood is easier. After heat treatment, Redwood (pine) is perfect for applications in wind and weather.

Applications
  • Roof carpentry
  • Floor joists
  • Cladding
  • Roof trusses
  • Steps
  • Walls
  • Ceilings
  • Floors
  • Kitchens
  • Cupboards
  • Packaging
  • Mouldings
  • Panels
  • Screens, fences,...
Professional Information

Average Density*

320-800 kg/m³
(average 500 kg/m³)

Radial Shrinkage

60 to 30% r.v.**

0,5 %

 

90 to 60% r.v.**

0,5 %

Tangential Shrinkage

60 to 30% r.v.**

1,1 %

 

90 to 60% r.v.**

1,3 %

Wood-working

60 to 30% r.v.**

1,6 %

 

90 to 60% r.v.**

1,8 %

Flexural strength

79 N/mm²

Modulus of elasticity

11.000 N/mm²

Compressive strength (parallel with the fiber)

47 N/mm²

Shear strength

7,5 N/mm²

Hardness – Radial

3330 N

Hardness - Surface

2940

* at a wood moisture content of 15 per cent / ** relative atmospheric humidity

 

Commercial information
(100x200 mm)

Length in meter:
1,8/2,1/2,4/2,7/3,0/3,3/3,6/
4,2/4,5/4,8/5,1/5,4/5,7/6,0/6,3

75x225 (75x200) mm

63x175/150 mm

50x150/125/100 mm

38x225/150/125/100 mm

32x175 mm

25x 225/175/150/125/100 mm

19x125/100 mm

 

houthandel Stevens
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