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Rolled Wool Prime, also known as Rockprime or Rockwool, is made from volcanic rock which gives it a great density. These characteristics makes it a superb material for insulation sound and fire control. Rockprime or rock wool insulation has a much higher density than fiber glass wool which means it will last longer and perform better. Rock wool insulation s density is 21kg/m3 and its thermal conductivity is 0.047W/mk, Rock wool performs better and last longer which in turn means it will save you more money and make your home more comfortable.

Rockwool Prime – NSAI Certified

Rockprime Datasheet

Rockprime’s Website

Rock Wool Prime Insulation

Rock Wool Prime Insulation demonstration video. Cavity wall insulation, spray foam insulation, airtightness and test, attic insulation with rock wool blown in.

Advantages Of Using Rock Wool Prime Insulation

  • It is more advantageous to use Rock Wool Prime insulation in new and old attics with timbers
  • There is no waste
  • Rock Wool Prime insulation is non-combustible and euroclass A1
  • Rock Wool Prime insulation does not rot or decay
  • Great acoustic performance
  • Unlike other types of blown wools Rock Wool Prime insulation does not move in the wind within the attic space (BRE Report 252-159)

Thermal Qualities

Rock Wool Prime insulation thermal conductivity is 0.047w/mk

Follow our table to calculate Uvalue or contact us for a CONSULTATION:


Fire Performance

Rock Wool Prime insulation has an A1 classification in accordance with BS EN13501-1 and is therefore a non combustible material as defined in our building regulations.



Energy Efficient Homes Ltd.,
The Crescent Building,
Northwood Business Park,
Santry Dublin 9
Energy Efficient Homes Ltd.,
Drogheda Industrial Park,
Drogheda, County Louth
Tel: (1890) 909022
Dave's Mobile: (087) 975 0914
E-mail: [email protected]
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Energy Efficient Homes Ltd. was created for people who want to improve the Energy Efficiency of their home or business. Our office is open 6 days a week to allow you to drop in and meet some of our highly experienced staff, who can demonstrate and explain the benefits of Insulation systems.