Urban downtowns are called concrete jungles because the skylines from New York to Vancouver are generally made of concrete. But that could change with a push underway to build more tall buildings with mass timber. …Mass timber made up just one per cent of all building construction materials in North America in 2022, according to an RBC report. But analysts expect the market to rapidly expand as existing mass-timber plants are being expanded and new ones are in the works, from B.C. and Alberta to Ontario and Nova Scotia. …Federal tracking shows mass timber has most commonly been used in institutional buildings, but as more research has emerged attesting to the fire safety of tall wood structures, recent changes to building codes have opened the door to building higher. Rick Jeffery, CEO of the Canadian Wood Council… believes it will be used much more often as Canada builds its way out of the housing crisis.