Good question. There is also CLT without glue. Check https://www.youtube.com/watch?v=4j_UjIshzMc https://www.youtube.com/watch?v=4j_UjIshzMc where Matt Risinge

Good question. There is also CLT without glue. Check https://www.youtube.com/watch?v=4j_UjIshzMc https://www.youtube.com/watch?v=4j_UjIshzMc where Matt Risinger is visiting a Swiss factory where they use wooden (berch?) nails and dowel pins in stead of glue. And by using more layers they also need no insulation. Gives R=24...