Bending Strength for Softwoods Chart North American Species Board List

Strongest Softwoods by Bending Strength

Bending Strength for Softwood Boards Chart North American Species List

Bending Strength of North American Softwoods

Not all softwoods are built the same. This means that the wood species best suited for your project will change depending your the application’s needs. For instance, the outdoor bench on the patio is best constructed with a rot-resistant wood like redwood. On the other hand, the frame of a house should be built with a much stronger species like Douglas fir. Today, we are going to focus on the latter as bending strength comes into play in almost every project.

 

To make sure we are on the same page, we need to discuss what bending strength actually represents. The bending strength of wood is measured by applying a force perpendicular to the woods’s grain. In this configuration, the strength of a wood board is maximized to incur a force. The reason for this is that wood fibers run through the grain in elongated strands. Thus, a force incurred by the end-grain can result in the wood fibers separating from each other and splitting the wood in half. But when a force is applied to the perpendicular to the grain, the fibers need to actually break in order for the board to snap into two. For reference, consider splitting fire wood. When the ax pierces the end grain, the fibers diverge and the board easily cracks into two. Now if you were strike perpendicular to the grain, you’d have to chip away layers of wood fiber with multiple strokes.
Measuring Bending Strength for Wood Perpendicular to the Grain

Characteristics of the Strongest Softwoods

The strongest softwoods aren’t just a one trick pony. They share a few other characteristics that further separate them from the pack. First of all, they also tend to be much more elastic. In terms of actual stiffness ratings, the most elastic softwoods are yellow pine, Douglas fir, Hemlock, Cypress, & Spruce. As you may have already noticed in the chart, those woods also have the top five bending strength thresholds in almost the same order. Next, the strongest softwoods also tend to have high compressive strength ratings. This the measurement of a wood species’s strength to withstand force pushed inward from end grain to end grain. To visualize, an example of this would be a table or desk leg being compressed between the ground and the top surface. Again, the same five species mentioned above also have excellent compressive strengths.

Grouping Softwoods by Bending Strength

Tier 1: The Heavy Lifters

Yellow Pine

Grown throughout the southeastern U.S., yellow pine is by far the strongest softwood on our list. It has the highest bending strength & compression strength of any softwood seen throughout North America. And it’s high strength-to-weight ratio makes it popular for building trusses and joists. When shopping for yellow pine, be mindful that the Longleaf species is endangered while the Slash, Shortleaf, and Loblolly pines are abundant.
Yellow Pine Bending Strength psi

Douglas Fir

As the second strongest softwood on out chart, Douglas fir is often found in structural framing. It’s more immune to abrasive wear & tear than other softwoods, and it offers some resistance to decay. As a result, this is a common material found in large buildings and bridge trestles. Combining those qualities with an extremely clean appearance, plywood sheets and veneers are often available in Douglas fir.
Douglas Fir Bending Strength psi

Hemlock

Hemlock offers a decent amount of strength for its density and hardness. However, it’s quite prone to decaying and is known for being difficult to work. Consequently, this nearly threatened species is best left for rough products like pallets and plywood. However, there are other alternatives for those two wood products as well. If you’re considering Hemlock for your project, we’d recommend you explore other options.
Hemlock Bending Strength psi

Tier 2: The Runners-Up

Cypress

Also known as bald cypress, this softwood shares the same resistance to decaying as many cedar species do. However, it differs in that it boasts a much higher bending strength than cedar species. Thus, cypress is often used in applications that require both resistance to decaying & extreme strength. Examples include sub-flooring in houses, outdoor pavilions, & boat decking.
Cypress Bending Strength psi

Sitka Spruce

As one of the less cooperative softwoods, Sitka Spruce is known for not taking well to stains (not a good quality to be known for). Also, the presence of knots in the wood dulls saw blades more quickly. As a result, not every lumber yard chooses to carry it. Nonetheless, it’s wide abundance and excellent strength make it appealing for some construction projects.
Sitka Spruce Bending Strength psi

Ponderosa Pine

Abundant throughout Western North America, Ponderosa Pine is used for wood trim, doors, panels, & even cabinets. In addition to it’s decent bending strength, it works well with both hand tools and power tools. Though it’s fairly inexpensive, the heartwood offers a clean appearance that finishes well. Lastly, Knotty Ponderosa Pine is available too for wall paneling and decorative applications.
Ponderosa Pine Bending Strength psi

Tier 3: The Middle of the Pack

Aromatic Red Cedar

Despite having the highest hardest rating of any species on this list, aromatic cedar is far from the strongest. Its stiffness causes the species to have pressure points when inuring a force. Nonetheless, it still has lots of uses due to is rot resistance and tendency to repels bugs like moths & termites. This makes it a good candidate for lining closets & building decks.
Aromatic Red Cedar Bending Strength psi

White Pine

Though this is one of the least dense wood species on our list, it packs a decent strength to weight ratio. Also, white pine handles well with both hand tools & power tools. If you’re shopping for pine on the East Coast, this is likely the species you’re buying. Though it’s quite abundant, it’s minimal rot resistance makes it best suited for indoor projects.
White Pine Bending Strength psi

Sugar Pine

Found throughout the Pacific Northwest, this giant species of pine is known for its dimensional stability. That is, the wood maintains its size when exposed to different temperatures and humility levels. Thus, Sugar Pine is frequently found in millwork, wood stencils, and templates. IF you’re shopping for pine out west, you’re likely buying sugar pine or its relative, the western white pine.
Sugar Pine Bending Strength psi





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