Engineered Wood for Prefabricated Housing

CLT panels, structural timber, and what Chinese suppliers can (and can't) deliver

Prefabricated housing is growing fast in Europe, North America, and parts of Asia. The appeal is clear — faster construction, better quality control, and reduced on-site waste. But the material specication matters, especially when you're sourcing timber components from overseas.

We don't manufacture CLT panels. Let's be upfront about that. What we do supply are engineered wood products that go into prefab and modular housing — specifically window/door profiles and dimensionally stable timber components. Here's what you need to know when sourcing for prefab projects.

What CLT Actually Is

Cross-Laminated Timber (CLT) is a panel product made of orthogonally oriented wood layers glued together. Think of it as "plywood on steroids" — panels can be 2–3 meters wide and up to 20 meters long. Used for walls, floors, and roofs in mass timber construction.

CLT carries loads in both directions because of the cross-lamination. That's what makes it different from standard plywood or OSB. It's classified as a structural product and requires code evaluation (ETA in Europe, ESR in the US) for structural use.

Why CLT fits prefab housing

Panels can be precision-cut in the factory, shipped to site, and craned into place. A two-story house can go up in days rather than weeks. The dimensional accuracy of the panels determines whether the on-site assembly actually works — if panels are out of tolerance, nothing fits.

What We Supply for Prefab and Modular Housing

While we don't make CLT, our engineered wood products are used in prefab and modular construction. The common thread is dimensional stability — components that need to maintain tight tolerances over years of service.

Window and door timber profiles. In prefab housing, windows are often installed in the factory rather than on-site. That means the window frame needs to be dimensionally stable — it's installed once and expected to last decades. We supply profiles to aluminum-timber window manufacturers who serve the passive house and high-efficiency residential market.

Modified wood for exterior applications. Prefab homes still need decking, cladding, and outdoor structures. Our marine-grade anti-corrosion decking and fire-rated cladding panels are suitable for prefab projects where the exterior envelope needs to perform without frequent maintenance.

Structural timber components. For prefab builders using our window/door profiles or specialty timber, the key requirement is consistent machining tolerance. A profile that's 0.5mm out of spec can cause assembly problems on the production line. We maintain ±0.5mm dimensional tolerance across production batches.

CLT sourcing from China — the current situation

CLT production in China is limited compared to Europe (where CLT originated). Most Chinese engineered wood factories focus on flooring, LVL, and glulam. If you need CLT panels, European suppliers (Austria, Germany, Italy) currently have more experience and code compliance. That may change — but for now, source CLT from where the industry has mature supply chains.

Dimensional Stability: Why It Matters for Prefab

In prefab construction, components are manufactured to fit together precisely. If a timber profile absorbs moisture and expands by 2mm, it won't fit the aluminum frame it was designed for. That's why dimensional stability is the single most important property for prefab timber components.

Our approach to achieving dimensional stability in window/door profiles:

Modified wood process

The wood undergoes heat and chemical modification that reduces its equilibrium moisture content. Result: less movement when ambient humidity changes. For prefab applications, this means the component stays within tolerance across seasons and climates.

Precision machining

CNC machining with tolerances within ±0.5mm. Every profile is checked dimensionally before shipping. For prefab builders, this means predictable assembly — no hand-fitting on the production line.

Moisture content control

Kiln-dried to target moisture content (typically 8–12% depending on destination market). Batches are tested before shipping. Inconsistent moisture content is the leading cause of dimensional movement after installation.

Sourcing Timber Components for Prefab: What to Specify

Specification	Recommended value	Why it matters
Moisture content	8–12% (target for destination)	Prevents movement after installation
Dimensional tolerance	±0.5mm	Ensures fit in prefab assembly
Modification type	Heat-treated or acetylated	Reduces moisture-related movement
Emission rating	E0 or CARB Phase 2	Required for residential indoor air quality
Fire rating (exterior)	Class B-s1, d0 (EN 13501-1)	Required for EU multi-story residential

Questions to Ask Prefab Timber Suppliers

What's your moisture content tolerance?

If they can't give you a number, that's a problem. For prefab, you want moisture content controlled within ±2% of target. Anything wider causes assembly issues downstream.

Can you provide modified wood?

Standard kiln-dried timber moves more than modified wood. For prefab applications where tolerances matter, modified wood (acetylated or heat-treated) is worth the premium.

What's your dimensional inspection process?

Every piece or statistical sampling? What's the reject criterion? Suppliers who can't answer these questions aren't set up for prefab-quality tolerances.

Do you have experience with prefab builders?

Prefab has different requirements than site-built construction. Suppliers who understand prefab know that on-time delivery and batch consistency matter as much as the product itself.

Summary: What We Can and Can't Do

We can supply

Window and door profiles — dimensionally stable, precision-machined, E0 emission rated
Modified wood decking and cladding — weather-resistant, fire-rated options available
Custom profiles — OEM/ODM services for prefab builders with specific design requirements

We don't supply

CLT panels — source these from European suppliers with established track records
Large-scale glulam beams — limited capacity; can discuss but not our core product