Here’s an article about Spray Foam insulation, from CBC News.

Spray foam insulation can make some homes unlivable

A CBC Marketplace investigation has found that for some homeowners, a “green” way to make their houses more energy efficient has left them out in the cold.

The growing popularity of spray polyurethane foam insulation may be creating an emerging problem in Canada. While the majority of spray foam installations occur without incident, problems can be costly and difficult to repair, and have led to a string of lawsuits in the U.S. as homeowners attempt to recover costs.

For more details: http://www.cbc.ca/news/spray-foam-insulation-can-make-some-homes-unlivable-1.2224287