Sidewalk Labs plans to build mass-timber high-rises as part of its redevelopment of the Toronto waterfront, but the current tallest buildings of this type are 18 storeys, and the company wants to go higher.
To explore how this could be achieved, the company spent a year working on “a digital proof of concept” or “proto-model” for a 35-storey timber high-rise, which would make it the tallest in the world.
Summarised in a series of Medium posts, the project both provides insights into the building’s hypothetical performance and explores how it could be most efficiently built in parts at a factory.
Sidewalk Labs calls the proof of concept the team developed Proto-Model X (or PMX for short). Apart from its sustainable credentials, timber is attracting interest because it opens the door to a new age of affordable, efficient and low-waste construction, with parts cut in a factory and assembled on site.
Sidewalk Labs rendered their mass-timber 3D building model in Autodesk’s Revit building software. The process involved eight distinct design steps, starting by exploring massing options and going on to plan a fossil-fuel-free mechanical, electrical and plumbing (MEP) system and create a variety of cladding.
A key process was evaluating structural options. Because timber is lighter than other structural building materials — PMX is approximately 2.5 times lighter than its concrete equivalent — it is susceptible to lateral forces, like wind.
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