Rockwool type insulation for rigid HVAC ducts?

I am not the biggest fan of fiberglass insulation for rigid ducts mainly because of its compressibility. This has led me to keep an eye out for alternatives and I’ve… I am not the biggest fan of fiberglass insulation for rigid ducts mainly because of its compressibility. This has led me to keep an eye out for alternatives and I’ve…Read MoreGreenBuildingAdvisor