Southern Yellow Pine
Also known as SYP, longleaf pine, loblolly pine, pitch pine · Botanical Pinus palustris, Pinus taeda
Revision history
- — Data re-verified in site-wide audit (formulas, sources, durability classes)
- — Working properties and comparable-species data cross-checked against listed sources
About Southern Yellow Pine
Southern Yellow Pine is a soft timber that works easily but bruises and dents in service, with a Janka hardness of 870 lbf (3,870 N) and a density of about 0.51 g/cm³. It grows in North America.
Radial 5.4% against tangential 7.7% is an unusually even T/R ratio of 1.43 — Southern Yellow Pine shrinks close to uniformly, which is why it holds a flat panel in interior joinery and furniture. Its fibre saturation point is near 28%. Below it this timber moves a great deal — 7.7% tangential — but evenly, at a T/R ratio of 1.43. Wide boards need genuine expansion room; they are less likely to cup than to simply change width. — wide boards need real expansion room, not a token gap.
At 510 kg/m³ a cubic metre of Southern Yellow Pine weighs about 510 kg air-dry — that figure, the 7.7% tangential and 5.4% radial movement and the 870 lbf hardness are the three inputs the calculators below actually consume. Select Southern Yellow Pine in any of them to get species-specific results for weight, moisture, shrinkage and hardness.
Working properties
How Southern Yellow Pine behaves at the bench and on the machine, drawn from the Southern Forest Products Association (SFPA), the Southern Pine Inspection Bureau (SPIB) and USDA data.
Durability & use classification
SYP heartwood is rated slightly durable (EN 350 Class 4), so ignore marketing that credits its resin with decay resistance. Its actual superpower is treatability: SYP is the most treatable softwood in the world. Its cellular structure permits deep, uniform preservative penetration without incising, which is why roughly 85% of all pressure-treated wood in the US is Southern Yellow Pine, and why treated SYP performs outdoors for decades. Untreated outdoors it will not.
Typical applications & suitability
Indoor Outdoor — Among the strongest and stiffest softwoods in North America, with design values at the top of the softwood range — and the continent's most commercially significant timber group. Outdoors, specify it treated, and insist on the treatment quality mark: you cannot tell by looking.
Documented end-uses: structural framing, roof trusses and heavy timber framing, engineered wood products, pressure-treated decking, docks, boardwalks and playground equipment, utility poles and marine pilings, industrial flooring, interior trim and panelling.
Comparable species
Species closest to Southern Yellow Pine by density, hardness, stiffness and bending strength, computed directly from the Vriksai species dataset rather than hand-picked.
Trade alternatives. Structurally compare Douglas Fir (stiffer) and Hem-Fir/SPF (lighter, easier to nail). Note SYP is a group name too — loblolly, longleaf, shortleaf and slash pine, with most market stock being loblolly.
Alternatives to Southern Yellow Pine
Southern Yellow Pine measures 870 lbf Janka at 0.51 g/cm³, EN 350 durability Class 4, movement rated Excellent. Southern Yellow Pine is rated Excellent for movement, which is usually why it was specified — so nothing below trades that stability down. Read the numbers against the Janka scale and EN 350 durability classes.
For furniture and interior joinery that needs to survive handling as well as humidity. Harder resists denting; check the movement figures have not worsened with it.
Easier to machine and to hand-finish, for interior work where the surface is not taking abuse.
Already well behaved — these are the few in our library that are measurably steadier still. Size the gaps with the shrinkage predictor and EMC calculator.
If Southern Yellow Pine is unavailable and the specification cannot change, these are the nearest substitutes across hardness, density, movement, stiffness, bending strength and durability class together — not on any single property. Lower distance means a closer match.
Southern Yellow Pine is EN 350 Class 4, so untreated exterior service is not advisable. These reach Class 1–2 at comparable hardness.
Computed from measured properties only — hardness, density, movement, stiffness, bending strength and EN 350 class. Price, availability and appearance are never inputs. Figures are representative values, not consignment absolutes: two species within a few percent are equivalent until verified on the material. Full method and the rules the engine cannot break.
Substitution is a match on durability class, movement and strength — not on colour or grain. Where two candidates are close, compare them directly before specifying.
Compare Southern Yellow Pine side by side
These comparisons turn on movement and finish quality more than on raw strength. Every pairing shows the measured figures side by side; full matrix in the comparison index.
Calculators relevant to Southern Yellow Pine
Weighted towards joinery and finishing, where Southern Yellow Pine is normally used. Full set in the tool index.
Understand the figures
Wood density reference — oven-dry vs air-dry basis · Moisture content — EMC, FSP and service conditions · Strength properties — MOR, MOE and what they govern · Durability & fire — EN 350 classes and E84 ratings.
Further reading. What is ThermoWood? · Wood moisture content explained · How to calculate board feet.
Common questions about Southern Yellow Pine
unverified no published source for this figure · grade commercial grading-group design property · calc derived from the figures above