Mass timber has moved from a niche experiment to a mainstream building system. Cross-laminated timber (CLT) panels now frame schools, offices, and mid-rise housing across North America, and architects specify engineered wood for its speed, its carbon story, and its clean job sites. That growth attracted heavy investment, and mass timber construction appeared ready to scale rapidly. Then one of the largest producers in the industry closed its doors abruptly, turning the event into a lesson for every builder who had bet on a single supplier. Understanding how CLT is made, why manufacturing is capital-intensive, and what happens when a producer fails helps contractors plan around the risk instead of discovering it mid-build.
What Mass Timber Is and Where It Fits in Modern Construction
Mass timber describes a family of engineered wood products built from layers of lumber bonded together. The best known is cross-laminated timber, in which boards are stacked at right angles and glued into panels that carry load in two directions. Glulam, or glued laminated timber, stacks boards in parallel for beams and columns, while nail-laminated timber (NLT) and dowel-laminated timber (DLT) use mechanical fasteners instead of adhesive.
Why engineered wood performs like concrete
A CLT panel behaves like a slab: it spans, carries vertical load, and resists shear, which lets it replace concrete and steel in floors, walls, and roofs. Panels arrive at the site cut to size with openings pre-routed, so crews assemble a building in days rather than months. The material also stores carbon, because the wood in the panel holds the carbon dioxide the tree absorbed while growing. Fire performance is another reason engineers specify it: thick wood members char at a predictable rate and keep carrying load during a fire, which lets designers meet code with exposed structure.
The wider engineered wood family
CLT is the headline product, but the same manufacturing logic appears across the industry. Structural composite lumber, I-joists, and panels all use smaller, faster-growing trees to produce large, predictable members. In the finishing trades the family extends to products like engineered wood flooring, which layers a wear surface over a stable core to handle moisture and movement better than solid boards.
| Product | Composition | Typical use | Load behavior |
|---|---|---|---|
| CLT | Cross-laminated lumber panels | Floors, walls, roofs | Spans in two directions |
| Glulam | Parallel-laminated beams and columns | Long-span beams, arches | Bending in one direction |
| NLT / DLT | Nailed or doweled lumber | Decks, walls, roofs | Bending in one direction |
| LVL / SCL | Veneer or strand composites | Headers, rim board, joists | Bending in one direction |
How Cross-Laminated Timber Is Manufactured
Making a CLT panel is a factory process, not a site process. Kiln-dried lumber is graded, finger-jointed into long lengths, and laid up in alternating layers. Adhesive is applied, the stack enters a hydraulic press, and the finished panel is trimmed, sanded, and routed into the exact pieces a project needs. The largest plants run continuous production lines and ship panels on flatbeds directly to job sites. Tolerances are tight, because panels must line up with steel connections and glazing on site.
The scale of modern CLT plants
Building a CLT plant is expensive. A full production line needs a large building, a hydraulic press that exerts enormous pressure, automated grading and handling equipment, and a steady supply of kiln-dried lumber. Industry observers estimated that the biggest North American facilities cost hundreds of millions of dollars to bring online. One cross-laminated timber factory that opened in Spokane, Washington, was billed at the time as the largest in North America, and it anchored a production network that spanned the country.
Why vertical integration attracted investors
Investors poured roughly $2 billion into one fast-growing mass timber firm between its founding in 2015 and its collapse in 2021. The pitch was vertical integration: control the lumber supply, the panel factory, the design team, and the construction crews under one roof, then undercut traditional builders on cost and schedule. In theory that model captured margin at every step; in practice it concentrated risk on a single balance sheet.
What Happens When a Major Producer Shuts Down
In June 2021, one of the largest mass timber producers in North America abruptly announced it was closing. The company had raised about $2 billion, operated a CLT plant in Spokane, Washington, and maintained roughly ten branch offices from Colorado to New Jersey. It began pulling out of active construction projects and shuttering operations nationwide within days of the announcement.
The immediate impact on projects
For contractors mid-build, the closure meant re-sourcing panels that are manufactured to order, not stocked on shelves. CLT panels are cut to exact project dimensions, so a failed order is not a simple substitution; the new supplier must re-engineer, re-certify, and re-fabricate the pieces. Projects faced schedule delays measured in weeks rather than days, and owners absorbed the cost of standing crews and rented equipment. Some crews were reassigned to other projects; others waited out the re-sourcing process with no firm date for restart.
The wider signal for the industry
The shutdown also cooled investor enthusiasm for factory-built construction. Venture capital had funded several offsite construction startups on the assumption that manufacturing would replace traditional field labor; when the highest-profile bet failed, lenders tightened terms for the whole category. Contractors who had watched brand shutdowns in other product categories recognized the pattern: a well-funded name can disappear quickly, leaving customers to sort out warranties, spare parts, and outstanding orders.
Building Supply Chain Resilience Into Your Projects
The lesson for builders is not to avoid mass timber, but to buy it like the critical component it is. A single-source strategy that works for commodity lumber is dangerous for engineered products with long fabrication lead times.
A due-diligence checklist for engineered products
- Ask where the product is manufactured and whether that plant is the company’s only facility.
- Confirm the supplier’s order book is diversified across regions and sectors, not dependent on one megaproject.
- Request financial references or trade credit history before committing to large orders.
- Verify that the manufacturer can transfer engineering files and certifications if production ever moves.
- Line up a second approved supplier before the project starts, not after a disruption.
- Put delivery dates, remedies, and cancellation terms in the contract in writing.
Diversify components too
Resilience extends beyond the headline material to the components that make assemblies work. Fasteners, adhesives, membranes, and flashing all come from specialized manufacturers, and a shortage in any one of them breaks the schedule. On exterior work, for example, hidden fastener systems for decking are a single-source item on many projects, and ordering them early protects the install date. The same approach applies to sealants, glazing gaskets, and any component with a long lead time.
Protecting In-Progress Work When Suppliers Fail
When a supplier fails mid-project, the first priority is protecting the work already in place. Exposed wood products need to stay dry, panel edges need protection from damage, and uninstalled material must be stored properly until a replacement plan is ready.
Mothballing the site
- Cover stored panels with breathable tarps and keep them off the ground on dunnage.
- Seal exposed panel edges with the manufacturer’s approved coating to prevent moisture uptake.
- Secure loose components in a locked container so nothing disappears during the pause.
- Document site conditions with photos and dates for the insurance and claims process.
The same logic applies at home
The care taken to protect an unfinished structure mirrors what homeowners do when they close up a property for the season. The routines for winterizing a house, from draining pipes to sealing openings, exist because an idle building deteriorates faster than an occupied one, and an idle construction site is no different.
Planning for the Worst Case on Every Project
Supply chain failures are rare, but they are also predictable in hindsight. Every engineered product has a single point of failure somewhere in its supply chain, and the projects that survive disruptions are the ones that asked what-if questions before signing the contract. That planning costs little at the front end and saves months when something goes wrong.
Contract terms that protect the builder
Spell out what happens if the material cannot be delivered. Include the right to substitute an approved equal, a clear process for re-engineering if the original product is discontinued, and a remedy for schedule impact that does not leave the builder absorbing the delay alone.
When projects end prematurely
Sometimes the disruption is total and the project never restarts. Abandoned structures eventually have to come down, and the teardown is its own trade: fast, efficient deck demolition work shows how much planning goes into taking a structure apart safely once the decision is made. The same foresight that avoids the failure in the first place also handles the aftermath.