Industrial Decisions Impacting Adhesives, Dowels, and Veneers in Mass Timber Production

In the realm of construction, Canada is witnessing a significant shift as hybrid and experimental approaches emerge, revolutionizing the production of timber products. These novel methods include blending veneer and sawn lumber layers, oriented strand and parallel strand products, and the integration of robotics and automated milling systems.

This transformation in production technologies is causing cross laminated timber (CLT) and other mass timber products to diverge into distinct paths, each with its own strengths and weaknesses. Each pathway is not just shaping domestic housing delivery but also Canada's opportunity to become a major exporter of timber products.

The debate in Canada is intensifying, focusing on whether to stick with conventional CLT based on dimensional lumber or transition to veneer-driven plants similar to large-scale plywood factories for housing. The choice between milling sawn lumber and veneer peeling processes has implications for waste streams, energy use, labor requirements, and long-term carbon accounting.

Traditionally, mass timber production involves milling logs into dimensional lumber, drying, planing, and gluing them into perpendicular layers to form CLT. This method fits into existing infrastructure and labor practices but has significant waste streams. On the other hand, veneer and rotary shaving processes peel logs into long, thin sheets or strips, which become the feedstock for laminated veneer lumber or can be pressed into hybrid CLT panels. This method has a higher utilization rate and more consistent mechanical properties.

Prominent manufacturers of veneer-based solid wood products in Canada include companies specializing in laminated veneer lumber (LVL), which is widely used for beams and structural applications. However, specific Canadian company names are not detailed in publicly available sources. Osmo Canada is notable for producing compatible finishes for veneered wood products, reflecting industry activity around veneer-based materials in Canada.

Another significant debate in the mass timber sector is whether adhesives or mechanical fasteners should be primarily relied upon. Adhesive-based products offer high strength, predictable performance, and well-established testing standards, but add embodied carbon, some rely on petrochemical inputs, and make recycling more difficult. Alternatives like dowel laminated and screw laminated systems use hardwood dowels or long screws to bind panels mechanically, offering a cleaner bill of materials, easier disassembly, and potentially more circular reuse. However, they are typically weaker, require thicker panels, and are less standardized in codes and supply chains.

Research is being conducted into the development of lignin-based adhesives as a replacement for petrochemical resins in mass timber production. If successful, these adhesives could lower the embodied carbon of mass timber even further and support a fully bio-based materials cycle.

The future of mass timber will be written not just by architects but by engineers, mill operators, and policymakers who decide how those laminates are made. Each choice in mass timber technology determines whether the sector grows in fits and starts or scales up to meet the real demands of housing, jobs, and climate action. The decision is not just about logs and glue, but also about industrial strategy, climate credibility, and whether Canada wants to lead in a material that could redefine global construction.

Industrial Decisions Impacting Adhesives, Dowels, and Veneers in Mass Timber Production