Contact the manufacturer of the product you are considering and ask them if the product would be warranted for your project. I think Chicago is a high snow area, we're not Canada but have plenty of snow and torch applied modified bitumen reigns supreme with the home depot contractors around here. Quite a few reputable roofers use it too. It's a good product when properly installed.
My father has been putting on torch down for about 35 years in Minnesota which gets some pretty nasty Winters. To date no call backs. About a hundred or so in total with the largest sections of roofs only being 8-10 squares.
One reason why more and more roofers may be getting away from torch down is the high insurance cost.
I've stoped promoting torch applied modified bitumen due to the fire hazard. Since we still do torch on request, there is no insurance savings unless we completely stop doing any torch work period and we're not ready for that. However all the low slope roofs we've done this year of any signifigant size have been TPO. We've only done modified on shingle-tie ins and then use self adhering if weather allows.
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