Spray foam insulation can be a very useful product for enabling insulation consistency and airtightness, and depending on the situation it can be quite cost-effective, but only if you have a good contractor, and its installed with the right thickness for your climate. Efficiency Matrix covers an implementation of closed cell foam on an old metal deck roof, closing the gaps to enable a high performing room in an old garage. It’s important to get a reputable contractor to get this done. We talk about the differences in open cell and closed cell foams.
The Link to Spray Foam solutions based in Australia Victoria http://foam-insulation.com.au