On These Unusual Construction Sites the Roof is Built First

By Chris Mills on at

Conventional construction logic says that you have to build foundations first, roofs last. Montreal, Canada, home to gravy-laden snacks and twisted logic, disagrees.

A Montreal construction company is building a 10-storey condominium complex in the heart of downtown. That itself is not surprising in a city undergoing rapid gentrification; what is unusual is the construction method.

The first floor and roof were built first, and then the roof is raised, a floor built underneath, and the process repeated. That means that no cranes or scaffolding are needed—normally an expensive process, which also involves disturbing traffic, as anyone who’s lived next to a large construction site knows all too well.

Although it’s probably a more expensive system than using cranes, it allowed the construction crew to work in a much smaller lot where there isn’t really space. And, of course, it means crews can work all year round, since they have protection from Montreal’s famously friendly winters. [CBC]