Home / Species / Spruce-Pine-Fir SPF

By Deepak Kumar · Founder, Vriksai

North America

Spruce-Pine-Fir SPF

Also known as SPF, spruce pine fir, Canadian SPF

Last updated: 15 July 2026Reviewed by: Vriksai editorial team — timber trade professionalsEditorial policy

Revision history

17 July 2026 — Data re-verified in site-wide audit (formulas, sources, durability classes)
15 July 2026 — Working properties and comparable-species data cross-checked against listed sources

🌲Softwood💧Moisture Stable

Janka Hardness

510grade

lbf

Janka (metric)

2268calc

Hardness Class

Softcalc

Density

0.42grade

g/cm³

MOE

9.5grade

GPa

MOR

63.0grade

MPa

Durability

Class 4

Slightly Durable

Fire (E84)

Class C

indicative

Thermal k

0.121

W/m·K

Green MC

95grade

Fiber Saturation

30grade

Radial Shrink

4.4grade

Tangential Shrink

7.4grade

T/R Ratio

1.68derived

Stability

Excellentcalc

About the fire rating. Indicative only, derived from density and published data — not a certified rating. Real performance depends on product, thickness, coating and installation. What our ratings do and do not certify.

Compare this wood:⚖ vs Paulownia ⚖ vs Scots Pine All comparisons →

About Spruce-Pine-Fir SPF

Spruce-Pine-Fir SPF is a soft timber that works easily but bruises and dents in service, with a Janka hardness of 510 lbf (2,268 N) and a density of about 0.42 g/cm³. It grows in North America.

Note: This is an engineered or treated product. The hardness shown reflects the base species; actual values vary with treatment grade and batch. Use as a guide, not a tested specification.

At 4.4% radial and 7.4% tangential the T/R ratio is 1.68 — typical, and manageable in interior joinery and furniture provided the gaps are designed rather than assumed. Its fibre saturation point is near 30%. Below it the wood shrinks steadily — 7.4% tangential, 4.4% radial. Ordinary territory: design the gaps rather than hoping the finish will hold it. — wide boards need real expansion room, not a token gap.

At 420 kg/m³ a cubic metre of Spruce-Pine-Fir SPF weighs about 420 kg air-dry — that figure, the 7.4% tangential and 4.4% radial movement and the 510 lbf hardness are the three inputs the calculators below actually consume. Select Spruce-Pine-Fir SPF in any of them to get species-specific results for weight, moisture, shrinkage and hardness.

Working properties

How Spruce-Pine-Fir SPF behaves at the bench and on the machine, drawn from the Western Wood Products Association (WWPA) and North-American lumber-industry data.

MachiningLight and easy to work in every operation — the definition of a forgiving construction timber. Its clean white appearance and small knots make it presentable enough for interior work.

FasteningEasy nailing and screwing; its light weight is precisely why framers prefer it over denser SYP for wall studs.

GluingGood — SPF feeds trusses and engineered products.

FinishingTakes paint and stain acceptably over a pale, clean surface.

Steam bendingNot a bending timber.

DryingKiln-dried to make it straight and dimensionally stable — a defining feature of the product.

Durability & use classification

SPF is rated slightly durable (EN 350 Class 4) with poor decay resistance, and the spruce component is difficult to treat, so this is an interior, protected-construction timber. Understand what you're buying: SPF is not a species but a grading combination of spruces, pines and firs sharing similar design values. Western/Canadian SPF may include Engelmann, Sitka, black, red and white spruce, lodgepole and jack pine, balsam and alpine fir; SPF-South adds Norway (red) pine and others. Any board could be any of them.

Typical applications & suitability

Indoor — The default framing lumber of North America — chosen for high fiber strength relative to weight, easy workability, straightness and price. It is a volume commodity, and specified as a design group rather than a species.

Documented end-uses: house construction and wall framing, trusses, joists and rafters, general framing and carcassing, interior projects and panelling, plus remanufacture into furniture, mouldings, crates and pallets.

Comparable species

Species closest to Spruce-Pine-Fir SPF by density, hardness, stiffness and bending strength, computed directly from the Vriksai species dataset rather than hand-picked.

Kail Blue Pine450 kg/m³ · 460 lbf Deodar Cedar480 kg/m³ · 580 lbf Hem-Fir450 kg/m³ · 500 lbf Sugi Japanese Cedar380 kg/m³ · 580 lbf

Trade alternatives. Its direct alternatives are Hem-Fir (also a group), Douglas Fir (stronger) and Southern Yellow Pine (denser, far more treatable). In Europe, Norway Spruce and Scots Pine fill the same role.

Alternatives to Spruce-Pine-Fir SPF

Spruce-Pine-Fir SPF measures 510 lbf Janka at 0.42 g/cm³, EN 350 durability Class 4, movement rated Excellent. At 0.42 g/cm³ Spruce-Pine-Fir SPF is chosen for weight. Substitutes are ranked to keep that advantage rather than trade it away for hardness. Read the numbers against the Janka scale and EN 350 durability classes.

Step up — harder than Spruce-Pine-Fir SPF

For anywhere the lightness is costing you surface durability — shelf edges, drawer fronts, table tops that get used.

Deodar Cedar580 lbf · 0.48 g/cm³ · Class 2+14% Janka · exterior-rated Douglas Fir620 lbf · 0.48 g/cm³ · Class 3+22% Janka Sweet Chestnut680 lbf · 0.56 g/cm³ · Class 2+33% Janka · 0.56 g/cm³ · exterior-rated

Step down — softer than Spruce-Pine-Fir SPF

Lighter still — relevant for panels, cores and anywhere handling weight or transport cost dominates.

Kail Blue Pine460 lbf · 0.45 g/cm³ · Class 4-10% Janka Norway Spruce380 lbf · 0.43 g/cm³ · Class 4-25% Janka ThermoWood Spruce Thermo-D380 lbf · 0.45 g/cm³ · Class 2-25% Janka · exterior-rated · modified timber

Similar, but more dimensionally stable

Light timbers can still cup badly. These are the more dimensionally settled options at similar weight. Size the gaps with the shrinkage predictor and EMC calculator.

Accoya Acetylated Radiata Pine710 lbf · 0.51 g/cm³ · Class 1stability gained by modification, not by species · rated Exceptional vs Excellent · 0.7% radial movement vs 4.4%Paulownia300 lbf · 0.28 g/cm³ · Class 43.9% tangential movement vs 7.4% · 2.4% radial movement vs 4.4%

Closest overall match

If Spruce-Pine-Fir SPF 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.

Scots Pinematch 0.95540 lbf · 0.49 g/cm³ · Class 4540 lbf vs 510 · 0.49 vs 0.42 g/cm³ Hem-Firmatch 1.05500 lbf · 0.45 g/cm³ · Class 4500 lbf vs 510 · 0.45 vs 0.42 g/cm³ Western Hemlockmatch 1.12540 lbf · 0.45 g/cm³ · Class 4540 lbf vs 510 · 0.45 vs 0.42 g/cm³

More durable for exterior use

Spruce-Pine-Fir SPF is EN 350 Class 4, so untreated exterior service is not advisable. These reach Class 1–2 at comparable hardness.

Accoya Acetylated Radiata Pine710 lbf · 0.51 g/cm³ · Class 1EN 350 Class 1 vs Class 4 · modified timber Thermally Modified Larch530 lbf · 0.55 g/cm³ · Class 2EN 350 Class 2 vs Class 4 · modified timber ThermoWood Pine Thermo-D540 lbf · 0.48 g/cm³ · Class 2EN 350 Class 2 vs Class 4 · modified timber

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 Spruce-Pine-Fir SPF side by side

Lightweight timbers are usually compared on stiffness and surface durability rather than hardness alone. Every pairing shows the measured figures side by side; full matrix in the comparison index.

Spruce-Pine-Fir SPF vs Scots PineSide-by-side data · 540 lbf Spruce-Pine-Fir SPF vs PaulowniaSide-by-side data · 300 lbf

Calculators relevant to Spruce-Pine-Fir SPF

Weighted towards span, deflection and coverage — the checks a light timber like Spruce-Pine-Fir SPF actually needs. Full set in the tool index.

Wood Moisture Content TrackerWood Science Wood Acclimation Time CalculatorWood Science Wind Load Calculator for Timber Structures (IS 875)Construction Timber Post & Column Load CalculatorConstruction Dovetail Spacing CalculatorJoinery Compound Miter Angle CalculatorJoinery Hoppus CalculatorMeasurement Huber Formula CalculatorMeasurement

Understand the figures

Janka hardness scale — how the lbf figure is measured · Wood density reference — oven-dry vs air-dry basis · Moisture content — EMC, FSP and service conditions · Strength properties — MOR, MOE and what they govern.

Further reading. What is ThermoWood? · Wood moisture content explained · How to calculate board feet.

Common questions about Spruce-Pine-Fir SPF

Is Spruce-Pine-Fir SPF strong enough for furniture or flooring?

It's a softer timber at 510 lbf (2,268 N), so it dents more easily than oak or teak and isn't the first choice for high-traffic flooring. Where it shines is lighter work — panels, mouldings, interior joinery and anywhere low weight and easy machining matter more than bruise resistance. Match it to the job and it performs nicely.

Will Spruce-Pine-Fir SPF hold up outdoors?

Honestly, not on its own — it's rated Slightly Durable (Class 4, EN 350), so untreated it won't last long once it's exposed to weather or damp. If you want to use it outside, it needs proper preservative treatment and a maintained finish. For interior work, though, durability isn't a concern at all and you can use it freely.

Does Spruce-Pine-Fir SPF move much once it's installed?

It's one of the more stable timbers, which is part of its appeal. At 4.4% radial and 7.4% tangential the T/R ratio is 1.68 — typical, and manageable in interior joinery and furniture provided the gaps are designed rather than assumed. You'll still want it dried to the right moisture content for your climate, but cupping and gaps are less of a worry than with a less stable wood.

unverified no published source for this figure · grade commercial grading-group design property · calc derived from the figures above

Tools that use this species

Janka Database ToolHardness for 60 species Green Weight CalculatorWeight of green timber Shrinkage PredictorDimensional movement EMC CalculatorEquilibrium moisture content Fiber Saturation CalculatorFSP by species Volume Converterm3, CFT, board feet

Sources & references

The Wood Database (Eric Meier) — compiled species data, one of the references behind the panel above. Which figure comes from which reference is not recorded field by field. Spot checks show the numbers do trace to published sources, but not all to the same one: strength values for US species follow the USDA FPL Wood Handbook exactly, while European species draw on European references instead. So a figure that disagrees with any single reference here is not necessarily wrong — different bodies measure specific gravity and shrinkage on different bases. If a number matters to your work, check it against the reference you intend to rely on.
Western Wood Products Association (WWPA) — SPF species-combination and grading data · species grouping, design values, uses
North-American lumber-industry data — SPF product and kiln-drying specifications · drying, workability, applications
EN 350 — European standard for natural durability of wood · durability class

Updated 15 Jul 2026 Values are representative; wood varies with provenance, age and grade. Confirm critical structural or fire figures against a test report for your actual product.