Is Poly B a problem in Ontario too?
The straight answer
Yes, Poly B was a national product. Ontario’s exposure concentrates in areas that boomed in the 1980s and 90s: about 39% of Mississauga’s housing stock dates to the Poly B window versus about 20% in Toronto’s older core.
The longer version
The pipe didn’t stop at the prairies. Poly B sold nationally through 1978 to 1998, and Ontario’s exposure follows its growth rings: suburbs that boomed in the 80s and 90s, like Mississauga at roughly 39% of housing stock in the window, carry about double the share of Toronto’s older core at 20%. The Ontario profile ranks all 49 profiled Ontario cities, and the checker answers for any address.
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