Crane Mats Guide: Species, Thickness, Load Ratings, and Cost

A crane set up on the wrong surface doesn’t lose you a day. It loses you the crane, and maybe a lot worse. Crane supports, whether crane mats or outrigger pads, can sink, shift, or exceed what the ground beneath them can bear, and any one of those failure modes can put a loaded crane on its side. Crane mats exist to stop that from happening: they take a concentrated point load and spread it over enough surface area that the ground underneath can actually hold it.

This guide covers what you need to know before you specify, rent, or buy: what mats are made from, how they’re rated, how to size them, how they go in the ground, and whether renting or owning makes more sense for your project. World Forest Group manufactures and ships crane mats for oil and gas, utility, construction, and renewable energy work across North America. This is the same walkthrough we give anyone who calls to talk through their project.

History of Crane Mats

Most people think modular crane mats were invented about 35 to 40 years ago in Beaumont, Texas. But ground protection for heavy lifts is a very old technology, dating back to the Egyptian Middle Kingdom, around 1950 BCE, nearly 4,000 years ago. The Egyptians solved the same problem a modern crane crew solves today: how to support a heavy lift, in their case 60-plus-ton statues or building components, when the ground underneath isn’t cooperating.

Their solution was the sledge.

Workers dragged the sledge across the ground to move colossal statues, the same task cranes handle today. The number of hands required in those images is a good visual for just how poor the ground-bearing conditions were out in the desert sand.

Now fast forward to the 21st century.

What a Crane Mat Actually Does

A crane mat is a heavy timber platform placed under tracks or outriggers, and on larger jobs across the crane’s full working area, to distribute the machine’s weight over more ground area than the bare soil could support on its own. Skip that step and a track or outrigger pad can sink into soft ground, shift mid-lift, or push pressure into the soil beyond what it can bear. Any of those can tip the crane.

This isn’t a paperwork exercise. Crane tip-overs are among the most serious and well-documented failure modes in heavy construction, and ground support is one of the most preventable contributing factors. OSHA’s crane and derrick standard, 1926.1402, treats ground conditions and supporting materials, including mats, as a compliance requirement, not a suggestion. The standard puts responsibility for adequate ground conditions on the controlling entity, or on the employer if no controlling entity exists.

A Mat Is Not a Mat: Species, Grade, and Dimension

Here’s the sentence that should be tattooed on every procurement spec: a mat is not a mat. Two mats with identical dimensions can carry loads that differ by 300 percent, depending on what’s actually inside them. Three variables drive real performance: species, grade, and dimension.

Species. There are roughly 20 commercial species used across the mat industry, and “hardwood” tells you almost nothing about what you’re buying. Species is the single biggest driver of bending strength, the modulus of rupture (MOR), measured in PSI, and MOR is the number that actually determines what a mat can carry.

Grade. Mats are practically built to three grades: #1, #2, and #3. Select Structural grade exists on paper but rarely shows up in mat manufacturing; the cost doesn’t pencil out at volume. A mill that grades its timber carefully is generally a mill paying attention across the board. There’s no reason to sort grades unless you’re committed to a consistent product.

Dimension. A true timber is 5 inches by 5 inches or larger. Anything smaller is lumber, not timber, and a mat built from a mix of true timbers and undersized lumber isn’t a genuine timber mat, no matter how it’s priced or marketed. This is where “dimension is not a specification” comes in: a 16 ft x 4 ft x 12 in listing tells you size. It tells you nothing about species, grade, moisture content, bolt grade, or the presence of wane, bark, or rot.

Crane Mats vs. Timber Mats

A crane mat is a subset of timber mats built to a higher load-bearing standard specifically for concentrated outrigger and track loads. They typically run 12 inches thick and use Grade 36 or better bolts. Standard timber mats run 6 to 8 inches thick and cover access roads, drilling and oilfield equipment support, and wetland crossings where crane-level ratings aren’t required. The materials and manufacturing overlap heavily; the load pattern and required rating do not. Specify one where you need the other and you end up with a mat that isn’t matched to your actual load.

Species Comparison: Oak, Mixed Hardwood, and Eucalyptus Oak

Oak has been the industry default for decades, and for good reason: it’s a genuinely strong hardwood, running around 550 PSI bending strength at #2 grade and closer to 1,000 PSI at #1 grade. Field lifespan runs roughly 2 to 3 years. Oak is also dense, which drives up both freight cost and handling load, and centuries of harvesting pressure, dating back to colonial-era shipbuilding, have made high-quality oak scarcer and more expensive than it used to be.

Mixed Hardwood

“Mixed hardwood” is a marketing term, not a technical category. It describes whatever commercially available species a mill had on hand, which means bending strength varies widely, anywhere from roughly 550 to 1,000 PSI depending on what’s actually in the mat. That variability is exactly why you ask suppliers for a documented MOR rating instead of trusting the sales rep. Mixed hardwood carries the lowest upfront price of the three categories and the shortest typical field life, often 18 to 24 months, which routinely erases the initial savings once you factor in replacement and freight over a multi-year project.

Eucalyptus

World Forest Group has supplied solid Eucalyptus timber mats in North America for more than 10 years; this is a proven material, not a new one. WFG’s Eucalyptus grandis comes from well-managed plantations in Brazil, sourced this way in part because commercially available Eucalyptus within Australia has grown scarce after decades of domestic demand.

What makes it worth a second look for crane work is the number: bending strength around 2,000 PSI, roughly double a #1 grade oak mat, with natural extractives that resist rot better than standard oak and mixed hardwood. It also runs lighter than oak at comparable thickness without giving up load capacity, which cuts freight cost and handling effort. Typical lifespan runs 5 to 7 years against oak’s 2 to 3, which matters enormously on a multi-year crane program.

Design values per AWC National Design Specification and AS 3818. Figures vary by supplier and drying process; always request a documented MOR/PSI rating rather than a general range.

Sizing: Thickness, Width, and Length

Weight capacity changes with roughly the square of the thickness times the material’s strength. That relationship is why an undersized mat isn’t a rounding error: a 12-inch mat that actually measures 11 inches has lost close to a sixth of its rated capacity (12 in x 12 in = 144 sq in versus 11 in x 11 in = 121 sq in). Confirm your supplier is shipping true dimensions, not a nominal thickness that’s thinner in hand.

8 to 12-inch mats are where crane work lives. For cranes, rigs, and anything producing concentrated outrigger or track loads, 12-inch high-MOR mats are typical. You can sometimes find exotic tropical species at 8 inches that outperform 12-inch mixed hardwood. Think Ekki or Cumaru. At typical thickness, species and grade matter as much as the number itself: an 8-inch oak mat and an 8-inch Eucalyptus mat are not interchangeable products, whatever the label says.

Eucalyptus width is a true 48 inches. WFG’s 10-inch crane mats run a symmetrical 50-inch width. Length typically runs 14, 16, or 18 feet. Twenty-foot mats are the length most commonly quoted on spec sheets, but the extra length rarely adds usable bearing area under a stationary outrigger pad. Buyers who default to 20-foot lengths are often paying a 10 to 20 percent premium for length they can’t really use. Because Eucalyptus carries higher bending strength per inch of thickness, it substitutes down in size against mixed hardwood:

Weight Capacity and Load Ratings

Weight capacity isn’t one number stamped on a mat. It’s bending strength (MOR, in PSI), thickness, and how the crane’s load actually spreads across the mat’s surface, working together. Most real-world mat failures aren’t from exceeding a mat’s total rated capacity; they’re from concentrated point loads exceeding what the mat can take at that one contact area, even when the crane’s total weight looks fine on paper. Or it’s from unknown voids in the ground below. Very big crane lifts usually plan using ground LIDAR to make sure there are no voids that will surprise operators, or the operator confirms the ground has already been improved with gravel or something similar.

Cranes can put significant point loads on a mat even though the tracks are street-safe with no grousers. That’s because cranes and booms shift slightly, and that’s why 10 to 12-inch, high-MOR mats, Eucalyptus at roughly 2,000 PSI or better, are a strong standard for this equipment class, rather than a #2 oak mat working close to its 550 PSI ceiling under the same point load.

Ground conditions change what a mat can actually deliver, independent of its rating. OSHA 1926.1402 treats ground conditions, slope, compaction, firmness, as separate from the supporting material itself. Soft, saturated, or uneven ground cuts into real support regardless of PSI, because a mat is only as stable as what it’s resting on. Safety margin matters here.

Installation

Installation is as much a safety factor as mat selection. Lay mats on cleared, reasonably level ground, positioned to fully support each outrigger pad rather than partially cover it, and inspect every mat for damage, gaps, or shifting before the crane sets up. On larger jobs, lay mats across the full working area, not just under the crane, so the surface stays stable as the crane repositions during the lift.

Rental vs. Purchase

The right call depends on project duration, how often you need mats across multiple jobs, and your equipment strategy overall.

Renting makes sense for short-term or one-off work: it keeps capital free and shifts storage and quality issues to the rental provider. Purchasing tends to win for companies with regular, ongoing crane mat needs, since the economics flip in favor of ownership once you’re avoiding repeated rental fees over a long enough timeline. Eucalyptus mats sharpen that math further: at a 5 to 7 year lifespan, a well-maintained mat can be recovered and reused across three to five additional projects, not just one.

The break-even point depends on your specific rental rates, purchase costs, and deployment frequency. A hybrid approach, renting for peak demand while owning a core inventory, is often the right answer for companies that scale up and down across a project calendar.

Crane Mats in Facility Work and Renewables

Utility: needs shift within a single project, from stable upland sections to wetland crossings, which makes species and thickness worth reassessing by segment rather than defaulting to one spec for the whole route. The size of the transmission structure being installed or refitted dictates crane size, and mat spec should follow the crane, not the other way around.

Facility work: project length and site conditions should drive selection more than industry habit. A short, dry build has different needs than a multi-year job with recurring crane use.

Renewable energy: wind turbine erection with 440-ton-plus crawler cranes is one of the heaviest load classes in construction, and a single layer of high-spec Eucalyptus crane mats can sometimes replace two layers of mixed hardwood in heavy-lift configurations, cutting mat count by roughly half. See our dedicated piece on Eucalyptus crane mats for wind power. Solar and battery storage sites lean toward lighter 4 to 5-inch mats, since these sites are generally well-improved and equipment loads are light enough that ease of handling matters more than raw thickness.

Cost and Total Cost of Ownership

Quoted price per mat is the easiest number to compare and the most misleading one to rely on. What determines your real cost is total cost of ownership: purchase or rental price, expected lifespan, handling and mid-project replacement labor, and freight, added up across the life of your crane program.

Depreciation tells the story plainly. On an 18 ft x 4 ft x 12 in mat, a Best Value Eucalyptus mat runs roughly $1,200 purchased against a 60-month lifespan, or $20 per mat-month. A comparable mixed hardwood #2 mat runs around $975 against a 21-month lifespan, or $46.43 per mat-month, better than double. The Eucalyptus mat earns back its price premium in about 9 months and keeps delivering value for another 51.

Weight compounds the effect through freight. At roughly $1,500 per truckload, more mats per load means lower cost per mat on every haul, not just once. A 12-inch Eucalyptus mat load fits around 11 new mats per truck, rising to about 13 after six months of field-driven moisture loss, against roughly 10 for a comparable mixed hardwood load. On repeated crane mat moves, that difference has run as high as $60 per mat per haul, real money across a large fleet moving multiple times a year.

Run your own numbers through World Forest Group’s total cost of ownership calculator rather than comparing sticker price alone.

Safety Beyond Load Capacity

Surface condition matters for crew safety during setup and breakdown, particularly in wet weather. Standardized Eucalyptus mats are manufactured without the wane, bark, and rot that create trip hazards and blind spots on a live site, and some contractors report meaningful reductions in trip-and-fall incidents on Eucalyptus jobs compared with standard mixed hardwood mats. OSHA’s guidance on blocking materials is direct: they should be large and strong enough to support the load safely, and crews should not use material with cracks, rounded corners, splintered pieces, or dry rot.

Mat condition isn’t a one-time check. A cracked, rotted, or shifted mat discovered mid-project needs to come out immediately. A compromised mat under a loaded outrigger is a live hazard, not a cosmetic issue.

Where Buyers Get This Wrong

• Treating total crane weight as the only number that matters. Concentrated point loads are usually the real failure risk, not the crane’s weight spread evenly.
• Picking thickness without species and grade. Two 12-inch mats from different suppliers can carry meaningfully different loads.
• Ignoring ground conditions. A correctly rated mat on saturated or unstable ground still won’t perform to its rating; OSHA 1926.1402 treats the two as separate requirements.
• Defaulting to rent or buy without running the numbers. The right answer depends on frequency and duration, not a blanket policy.
• Skipping verification of actual delivered dimensions. A shortfall in thickness or width is a real capacity loss, not a rounding error.

The Bottom Line

Crane mats are safety-critical equipment, not a commodity where the cheapest option automatically wins. The right choice matches species, grade, thickness, and rental or purchase strategy to your actual crane class, project duration, and site conditions. Reference an actual standard where one exists: the North American Matting Association published the first U.S. timber mat standard in late 2023, and pointing to compliance with that standard, or its underlying principles, puts the quality burden where it belongs, on the supplier.

Ready to see how these choices play out on your project? Run the numbers through our total cost of ownership calculator, or contact our team for a documented MOR rating on your next crane mat order.