External Wall Insulation (EWI) is a cladding system comprised of insulation, reinforced mesh and waterproof plaster which is applied to all the external walls of a building. The application of EWI is primarily designed to retain heat in a building and it also leaves you the opportunity to create a whole new look for the exterior of your house.
By wrapping the entire structure you can be ensured that thermal bridging is eliminated. This can’t be fully achieved with internal wall insulation due to the junctions of internal uninsulated walls with the exterior uninsulated façade.
This method of insulation is usually used in cases where the construction of the building is hollow blocks (9” cavity blocks), solid walls with no cavity properties. External insulation is also used widespread in new builds.
The external perimeter of the house is externally insulated using a high density board, 100mm or greater, which is mechanically fixed onto the exterior wall. A base coat render is applied onto the insulation which is bonded with a reinforced mesh which will strengthen the wall. Following the application of two more layers of coating, the wall is ready for finish coat. The homeowner has many different finishes and colours to choose from. There is a suppliers’ product guarantee of works when the work is complete. There are SEAI grants available for this External Wall Insulation of up to €8,000 depending on property type.
Benefits of External Wall Insulation:
- Adds value to your home by increasing your BER rating
- All works are carried out externally, no disturbance for the inside of your home
- Saves up to 40% on your heating cost
- Low maintenance as no external painting is required
- No reduction in room sizes or internal redecoration required
- Increases weatherproof ability of walls
- Increases airtightness and reduces draughts
