All info I've read has been in swedish and don't remember where. But unless my memory fails me the purpose is heat insolation. A quick google suggested that it

All info I've read has been in swedish and don't remember where. But unless my memory fails me the purpose is heat insolation. A quick google suggested that it can also used for fire safety, to increase strength and resist large temperature differences. But that's not the type of mesh I'm thinking of (it seemed those meshes were quite noticeable).