ROCKWOOL HARDROCK® Multi-Fix (DD) Underlay is a stone wool insulation board used as a primary base layer beneath the ROCKWOOL HARDROCK MULTIFIX DD to create greater insulation thicknesses.

Key Features

  • Non-combustible in accordance with UK building regulations

  • Presents no smoke hazard, and will not contribute to fire growth in any stages of a fire

  • Zero Ozone Depletion Potential (ODP) and Global Warming Potential (GWP)

Unable to find what you were looking for?

Do you have questions about the product, systems or anything else? 
We're here to help - contact us and one of our experts will help you.

Contact us

Discover more