Rockwool Insulation

Rockwool is a premium insulation - made from volcanic rock melted at high temperatures and spun into a mat or batt of fine fibres -  Rockwool only burns at temperatures in excess of 1000c so in effect provides a fire barrier for your roof.

The other main benefit of Rockwool is that is about 4 more dense than fibreglass insulation so has much better acoustic properties and so is used when insulation requires both acoustic & thermal properties.

Forms: Rockwool insulation comes in batts, mats and loosefill

R-Value: Rockwool Insulations could come in a range R value but because mostly used for acoustic in walls and floors most Rockwool products on the market seem to have a fairly low R values around R1.5 up to R3

Advantages of Rockwool Insulation: 

  • Relatively easy to install if ceiling space is open
  • Both Heating and Cooling properties
  • Reduces noise - Great Acoustic properties
  • Provides a Fire Barrier
  • Resistant to Insects and rodents
  • Made from 30-40% recycled building and slag waste
  • Does Not Shrink - keeps its R value over time.

 Disadvantages of Fibereglass Insulation:

  • Required Gaps around down lights and electric boxes reduces the effectiveness
  • Loses effectiveness if Insulation becomes wet or damp
  • More expensive to transport as cannot be compressed
  • It is cheaper to use Fibreglass