Unvented Roofs Without Spray Foam: A New Free Course Here’s the backstory on “Unvented Roofs Without Spray Foam“, a new free course taught by Kohta Ueno and offered in partnership with the Northeast Sustainable Energy Association and Building Science Corporation: Back in 2016, the Building Science Corporation team started… Continue reading “Unvented Roofs Without Spray Foam: A New Free Course”