Organizers of last week’s International Mass Timber Conference in Portland, Ore., devoted a whole track of the three-day event to environmental and sustainability aspects of the mass timber sector — an indication of the importance of sustainability to the tall timber building brand.
Manufacturing of cross laminated timber, or CLT — the product used to construct tall timber buildings — has the potential to revitalize the timber sector and the rural communities in Oregon that have fallen on hard times because of the widespread closure of timber mills across the state, reports Oregon Business.
But experts concede the environmental benefits of CLT are complex and difficult to measure.
Structural engineers look at the lifecycle emissions of CLT when assessing the environmental impact of tall timber buildings. The lifecycle analysis takes account of the greenhouse gas emissions from the harvesting of the wood, through the manufacturing and construction of tall timber buildings, to their eventual demolition.
When taking this cradle-to-grave assessment, the environmental benefits of CLT are not clear.