Timber construction & bio-building

Timber construction & bio-building uses engineered wood — cross-laminated timber (CLT), glue-laminated timber (glulam) and laminated veneer lumber (LVL) — as the primary load-bearing structure for buildings, replacing steel and concrete with a renewable, carbon-sequestering material. Stora Enso’s Ybbs mill delivered its one-millionth cubic metre of CLT in June 2026, and the global CLT market is forecast to reach $4.38B by 2030 at an 18.1% CAGR. A Kerto LVL floor system weighs roughly 34 kg/m² versus 675 kg/m² for reinforced concrete — a 94% weight reduction — while the carbon footprint of Kerto LVL fell 57.5% to 119 kg CO₂-eq/m³ in the 2026 EPD. The 2021 International Building Code Type IV-A permits mass-timber buildings up to 18 storeys, opening the mid- and high-rise segment.

The key directions of timber construction & bio-building are:

1. Cross-laminated timber (CLT): layers of kiln-dried lumber stacked at 90°, bonded and pressed into solid panels with steel-grade structural performance; Mercer Mass Timber’s Spokane plant alone outputs 104,000 m³/yr.
2. Glue-laminated timber & laminated veneer lumber (Glulam & LVL): long-span beams and columns from finger-jointed lumber or 3 mm peeled veneers; Kerto LVL delivers strength-to-weight comparable to steel.
3. Prefab modular timber construction (Prefab Modular Timber): factory CNC-cut kits-of-parts and volumetric room modules; Blumer Lehmann’s new German plant targets 400 room modules/year.
4. Bio-building & low-carbon certification (Bio-Building & EPD): EN 15804 / ISO 14025 Environmental Product Declarations, FSC/PEFC chain-of-custody and carbon-sequestration accounting under the EU Construction Products Regulation.

Sectoral value chain#

[sustainable forestry] ──> [sawmilling / veneer] ──> [engineered wood] ──> [CNC prefab]
                                   │
                          (CLT press / glulam / LVL)
                                   │
                                   ▼
[bio-building] <─── [design + EPD] <─────┘

Value chain levels#

Cross-cutting technologies of the sector:

• CLT cross-lamination pressing (CLT Cross-Lamination Pressing): alternating 90° layers bonded under pressure for two-way structural action.
• Continuous LVL billet production (Continuous LVL Billet): veneers bonded with phenol-formaldehyde into a knot-free billet, 2.5 m³ logs per 1 m³ LVL.
• CNC digital prefabrication (CNC Digital Prefab): factory cutting of complex joints and openings to ±mm tolerance, cutting site waste and erection time.

The stack rests on three engineered-wood platforms: cross-laminated pressing, veneer laminating, and CNC digital prefabrication.

1. CLT cross-lamination pressing (CLT Cross-Lamination Pressing):
   • kiln-dried boards are stacked in alternating 90° layers, bonded with structural adhesive and pressed into solid panels with two-way load-bearing action rivalling reinforced concrete.
   • case: Stora Enso Ybbs delivered its one-millionth m³ of CLT in June 2026; Mercer’s Spokane press lays up to 140 boards/min.
2. Laminated veneer lumber (Laminated Veneer Lumber):
   • 3 mm rotary-peeled, strength-graded softwood veneers are bonded with phenol-formaldehyde into a continuous knot-free billet — 2.5 m³ of logs per 1 m³ of LVL, with strength-to-weight comparable to steel.
   • case: Metsä Wood’s Kerto-Ripa floor at 34 kg/m² is 94% lighter than the 675 kg/m² reinforced-concrete equivalent, removing ~641 t of material per 1,000 m².
3. CNC digital prefabrication & modular (CNC Digital Prefab & Modular):
   • panels and beams are CNC-cut to ±mm tolerance with pre-drilled connections, then assembled into volumetric room modules for crane erection on site.
   • case: Nordic Structures’ Membertou 5-storey building was erected in 16 weeks; Blumer Lehmann’s Steinau plant targets 400 room modules/year.