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Attic Insulation - Rockwool RockPrime

Rockwool RockPrime Blown Loft insulation is a high-performance Rockwool granulate that offers quicker installation than roll and causes minimum disturbance. It meets and surpasses today's thermal regulations for both new build and existing attic spaces. Installation is quicker and cleaner than conventional roll insulation; the average semi-detached can be insulated in about one hour.

Rockwool RockPrime ...
High Performance Guaranteed

Design and Insulation

At EcoWarm Insulations we have invested significantly in the most up-to-date machinery, which means the installation of Rockwool RockPrime is extremely fast, efficient and clean.

All the equipment and insulation arrives in a truck specifically designed for the job. Only a hose will pass through your home. A two-man team installs the insulation. Firstly, they will insulate all water tanks and pipes, put in place measuring gauges and mark out where all electrical cables are located; then one technician will stay in the truck to load the insulation into the hopper of the blowing machine, while the other will be in the attic directing the flow until the insulation is filled to the required depth. The main benefit of RockWool Rock Prime over conventional roll-out insulation is that it will fill every void there is in the old insulation: there are no joints through which heat can escape. And as the depth gauges allow you to clearly see the depth achieved, you can be sure you get exactly what you pay for.

No Damage

Rockwool RockPrime will not damage any metal components in the loft nor react with PVC cables.

Fire Classification

Due to Rockwool RockPrime's non-combustible properties, the insulation can be installed up to and around the chimney breast. Rockwool RockPrime loft insulation achieves an A1 classification in accordance with BS EN13501-1, and is therefore noncombustible as defined by UK and Ireland building regulations.

Acoustic Performance

Rockwool RockPrime can improve the sound insulation of a building substantially. 250mm of Rockwool RockPrime loft insulation with an isolated 12.5mm plaster slab results in a reduction of >50dB in airborne sound being achieved.

Durability

Rockwool RockPrime is a durable material. When installed, it will not be affected by normal ventilation within the attic space. It will remain an effective insulant for the lifetime of the building.

Benefits

  • Excellent thermal insulation.
  • Ideal for new and existing attics.
  • Attic can be filled to any depth.
  • Quicker to install than rolls.
  • Excellent sound insulation.
  • No waste.
  • Does not rot or decay.
  • Minimises thermal bridging.
  • Will not sustain vermin.
  • Not displaced by air movement within attic.

Download Brochure

Rockwool Blown Loft Insualtion (PDF)

Frequently Asked Questions

Visit or Rockwool Blown Loft FAQ page or contact us online.

U-Values Achieved
Insulation Depth
in mm
U-Value
in W/m2K
200mm 0.26
270mm 0.16
330mm 0.13
350mm 0.12
420mm 0.10
460mm 0.09

Here's How EcoWarm Insulations Can Make Your Home The Ultimate In Energy Efficiency With High Performance Attic Insulation

EcoWarm Insulations can install high-performance attic insulation with the minimum of fuss and in as little as one hour from start to finish. Rockwool RockPrime is renowned for its high quality and superior insulation properties. We are proud to be fully accredited Rockwool installers. RockPrime is ideal for new-build and existing attic spaces. Installation is quick, clean and waste-free. Our employees are expertly trained, while the technology we utilise is state of the art.

Here's a step-by-step guide showing how EcoWarm Insulations installs Rockwool RockPrime attic insulation.

  1. Preparation is key. Existing insulation is inspected to ensure it is installed correctly; vents are inspected to ensure they are clear; height gauges are stapled onto the joists to ensure the insulation will be filled to the required level.
  2. Pipes and tanks are insulated first. The walkway to the tank is installed and all main cables are labelled. The attic hatch is then insulated. At this point the attic itself is ready for insulation.
  3. Insulation is filled to the required level. All the equipment and insulation arrives in a truck specifically designed for the job. Only a hose will pass through your home. One technician will stay in the truck to load the insulation into the hopper of the blowing machine; the other will be in the attic directing the flow until the insulation is filled to the required depth.
  4. Insulation of your attic is now complete.The main benefit of RockWool RockPrime over conventional roll-out insulation is that it will fill every void there is in the old insulation: there are no joints through which heat can escape. As the depth gauges allow you to clearly see the depth achieved, you can be sure you get exactly what you pay for. You will have a warm, comfortable home.

We also offer Knauf Ecose attic insulation and Aluthermo Quattro Thermal Reflective attic insulation.