What is Southern Yellow Pine?

Southern Yellow Pine is an attractive type of wood from the southeastern United States, known for its light yellow-brown heartwood and whitish-yellow sapwood. This wood is valued for its beautiful grain patterns and versatile applications, both indoors and outdoors. Below are the characteristics, origin, applications, and technical specifications of Southern Yellow Pine.

Origin

Southern Yellow Pine (Pinus spp.) is a collective term for various botanical species that grow in the states of Louisiana and Mississippi. The main species are:

  • Pinus palustris Mill.
  • Pinus rigida Mill.
  • Pinus elliotii Engelman. (‘longleaf’ or ‘slash pines’)
  • Pinus taeda L. (‘loblolly pine’)
  • Pinus echinata Mill. (‘shortleaf pines’)

These trees come from extensive production forests that are both economically and ecologically important.

Appearance and Structure

Southern Yellow Pine can reach an average height of 30 meters, with a clear trunk of 10 to 18 meters and a diameter of 40 to 80 cm.

Characteristic Description
Height Up to 30 meters
Diameter 40-80 cm
Clear Trunk 10-18 meters

Color and Grain

Southern Yellow Pine features light yellow-brown heartwood and whitish-yellow sapwood. The growth rings are distinct and sharply defined, with a strong contrast between earlywood and latewood. The wood has a fine to moderate grain and a straight grain pattern, with clear flames on the flat sawn wood and stripes on quarter-sawn wood.

Color Description
Heartwood Light yellow-brown
Sapwood Whitish-yellow
Grain Distinct flames and stripes

Drying and Moisture Content

Upon import, Southern Yellow Pine has a moisture content of approximately 17%.

Machining

Southern Yellow Pine is easy to work with, both machine and hand tools. Resin may sometimes stick to tools when machining wet wood, so timely cleaning is recommended. Gluing is also straightforward, but it is advisable to glue the wood immediately after machining to prevent resin exudation.

Finishing and Fastening

The finishing of Southern Yellow Pine proceeds smoothly, but it is important to degrease resin-rich areas first with thinner. Nailing or screwing is hassle-free.

Technical Specifications

Property Value
Average density 540 kg/m³
Radial shrinkage (60-30% r.h.) 0.7%
Radial shrinkage (90-60% r.h.) 0.9%
Tangential shrinkage (60-30% r.h.) 1%
Tangential shrinkage (90-60% r.h.) 1.5%
Movement (60-30% r.h.) 1.7%
Movement (90-60% r.h.) 2.4%
Bending strength 105 N/mm²
Modulus of elasticity 12,000 N/mm²
Compressive strength (parallel to grain) 60 N/mm²
Shear strength 11.1 N/mm²
Hardness (Janka) – End 4400 N
Hardness (Janka) – Side 4200 N

Commercial Dimensions

Thickness Widths Lengths
26 mm 105/155/205/255/305 mm 245 to 610 cm
40 mm 155/205/255/305 mm
52 mm 155/205/255/305 mm
65 mm 155/205/255/305 mm

Applications

Southern Yellow Pine is suitable for various applications, including:

  • Interior carpentry: Furniture, stairs, flooring
  • Molding and cladding: Doors, windows, shutters
  • Shelving

Conclusion

Southern Yellow Pine is a versatile and durable type of wood that is excellently suited for various indoor and outdoor applications. With its beautiful grain patterns, easy workability, and attractive colors, it is a popular choice for stairs, flooring, furniture, and cladding.