One thing I really like about doing product LCA is that you keep finding things you would never think about at first. Foam insulation is a good example. When we look at insulation, we normally think about thermal performance, thickness, recycled content, embodied carbon, etc. But there is another thing hiding in there that can make a pretty big difference to the LCA result: *the blowing agent.* And this is where it gets interesting. Some foam insulation uses gases with a high global warming potential. Not all of that gas necessarily gets released when the product is made.
