Cavity Wall Insulation

Lowers your heating costs – prevents damp and condensation build up, increases value of your home – creates a warm, health living environment for you and your family

We use Bonded Bead to Insulate Cavity Walls

Cavity Wall Insulation

Up to 30% of your home’s heat loss comes from uninsulated cavity or solid walls, costing you money on your heating bills and encouraging damp and condensation.

Insulating your home with NSAI Certified Bonded Beads lowers your heating costs, prevents damp and condensation build up, increases the value of your home and creates a warm, health living environment for you and your family.

Kore Fill Cavity Wall Insulation
Cavity Wall Cross Section
Cavity wall pump
Brusna staff using borescope
Brusna staff with cavity pump
Cavity pump camera

Extraction of Cavity Wall Insulation

Cavity wall insulation extraction is a system used for the removal of ineffective or poor insulation from the cavity wall of existing houses and buildings.

We at Brusna Energy Solutions can extract a variety of insulation products such as mineral wool, glass fibre and bead from your cavity walls. These insulation products can absorb water, shrink and settle in specific areas leaving other areas of your cavity wall vacant.

Water can break down the old insulation material and this can result in water transferring to the inside walls which can in turn cause mould inside the walls and in your building which can damage your plaster, paintwork and timber windows. Any gaps or spaces in poorly installed insulation will result in heat loss from your home.

The first step is for a member our Brusna Energy Solutions Sales/Surveying team to visit your home to survey your walls with a borescope and advise you on your extraction and re-insulation options. We use a borescope to monitor the extraction process to ensure that the cavities are clean. We offer a certificate of clean cavity guarantee afterwards.

The extraction process may take between one and two days with minimal disturbance to you or your home. After extraction is completed our trained and experienced cavity wall installation team will then proceed to the installation phase of pumping the cavity wall with Korefill Bonded Beads.

Extraction process:

  1. If the property is of brick construction, we remove a brick at a number of locations around the property to allow the extraction machine to vacuum out the old insulation material. If the property has a render finish, we drill a core at a number of locations around the property.
  2. We insert pressure lines to blow the insulation down to the vacuum points at the bottom of the walls. A whip hose is also used to break up the old insulation.
  3. After each section is cleared, we use the borescope to survey the space making sure the cavity is clean.
  4. Once the process is complete, we reinstate the removed bricks or cores drilled.
  5. All waste materials are removed by us and disposed by a registered waste company.

The property is now ready for re-insulation with NSAI approved cavity wall insulation system.


Better Energy Homes Scheme Grants

Due to Ireland’s International commitment to reduce its emissions of harmful CO2, the government provides grants to home owners for attic insulation, cavity wall insulation, heating controls upgrades and energy efficient oil and gas boilers further reducing the cost of insulating your home.

As registered SEAI contractors we can apply for these grants on your behalf.

If you have any questions or need help, feel free to contact with our team, or you can call us any time 096 749 80.

[dica_divi_carousel show_items_desktop=”5″ centermode=”on” loop=”on” autoplay=”on” hoverpause=”on” scroller_effect=”on” transition_duration_scroll=”3000″ advanced_effect=”1″ _builder_version=”4.19.5″ _module_preset=”default” global_colors_info=”{}”][dica_divi_carouselitem button_url_new_window=”1″ image=”” _builder_version=”4.18.0″ _module_preset=”default” global_colors_info=”{}”][/dica_divi_carouselitem][dica_divi_carouselitem button_url_new_window=”1″ image=”” _builder_version=”4.18.0″ _module_preset=”default” global_colors_info=”{}”][/dica_divi_carouselitem][dica_divi_carouselitem button_url_new_window=”1″ image=”” _builder_version=”4.18.0″ _module_preset=”default” global_colors_info=”{}”][/dica_divi_carouselitem][dica_divi_carouselitem button_url_new_window=”1″ image=”” _builder_version=”4.18.0″ _module_preset=”default” global_colors_info=”{}”][/dica_divi_carouselitem][/dica_divi_carousel]

Cavity Wall Insulation Step by Step


Cavity Walls Inspection

This is not too difficult as many homes built in Ireland were built with cavity walls and most people know if they have them. If not, we do a simple site survey to determine if you do. We drill an exploratory bore hole in your wall and use a borescope test (an optical device) which enables us to view the cavity, its thickness and if there is any masonry or other obstructions within it.



We survey your room ventilation to determine the adequacy of fresh air entering your home. Ventilation is critical for a healthy and comfortable living environment for you and your family. Each house should be upgraded so that ventilation complies with Part F of Building Regulation 2019, for both background in habitable rooms and permanent ventilation for heat producing appliances (open fires, stoves etc.), Part J for houses pre 2014.


Drill Pattern

Each manufacture of bead has a specific drill pattern to guarantee the optimal efficiency of the cavity fill. We use Bonded Bead. It has a thermal conductivity of 0.033W/mk. This will achieve 0.20W/m2k in a 150mm cavity to meet current building regulations. With a wider cavity, for example 200mm, we can achieve 0.15W/m2k. All our installers are trained with many years of experience.


Pumping the cavity walls

Once the holes have been drilled, we start pumping the bonded beads into your walls. Once again, there is a specific method specified by Kore as to how this is done and we adhere to these specifications. Cavity wall insulation completely fills the cavity, removing the risk of insulation gaps. Thermal performance will not diminish over time.


Filling in the holes

Once the cavity has been filled with bonded beads, and checked to make sure there are no gaps, we fill in the hole made during the drilling process. We first fill the holes with specially designed filler and then we paint the filled holes matching the colour of your home.

If you have any questions or need help, feel free to contact with our team, or you can call us any time 096 749 80.


"Thank you for the job you recently did on my house. I got the spray foam insulation into the roof rafters and I have to say it's made a huge difference to the heat in the house. I will definitely recommend you."

- Valerie, Mayo

"The workers were professional at all times and worked all day until the job was completed."

- James, Mayo

"I found the work done on the house was excellent and it was a professional job."

- Martin, Mayo

"Very pleased with insulation work done to my home. Everything was explained to me and there was no mess. Thank you."

- Pauline, Mayo

"I found Brusna Energy very thorough and professional in their work. I'm very happy with the finished works on the house."

- Eddie, Mayo

"I would highly recommend Brusna Energy Solutions; from management to staff, all were very helpful. The finish is excellent and everything around the house was left clean and tidy."

- Leo, Mayo

"We are delighted with all the work that was carried out. Our home is cosy and warm, it has changed our lives. Many thanks."

- Bernard, Mayo

"Thank you so much for a lovely job, we were very pleased."

- Eithne, Mayo

[dica_divi_carousel advanced_effect="1" _builder_version="4.20.0" _module_preset="default" global_colors_info="{}"][dica_divi_carouselitem button_url_new_window="1" _builder_version="4.20.0" _module_preset="default" global_colors_info="{}"][/dica_divi_carouselitem][/dica_divi_carousel]