What is Pumped Cavity Insulation?
In relation to the pumping of your walls with a bonded bead system you would noticeably improve the overall thermal properties of your house and in turn reduce your energy bills for the winter months. However, there are a number of issues you should be aware when filling your wall’s cavity: If there were any frost or structural damage to any of the house’s external walls pumping of beads into the cavity would not be advised. The width of the cavity between your external wall leaf and the installed aeroboard should be at least 50mm. If there is any problem with dampness in the internal leaf it would not be recommended to add the beads to the cavity as they would only increase the path for water to travel into the wall. Get a full assessment from a number of bead installers to compare prices, U–values promised, guarantees and their IAB certification (Irish Agrément Board).
The bonded bead system is the above mentioned and not the polyurethane foam, which expands in the wall, as the latter presently does not have certification from the IAB. The foam system will provide a lower overall U- value but could change the properties of your wall sometimes leading to moisture problems.