To ask the Minister for Communities how many Northern Ireland Housing Executive properties have poorly performing cavity wall insulation; and how many have had remedial and upgrade work carried out to address this since 2015.

In 2019 the Housing Executive published their research report on Cavity Wall Insulation. The findings for the Housing Executive’s stock were based on a sample survey of 825 properties, and it was found that 63% of these properties had cavity wall insulation installations that were non-compliant with modern industry standards because there were found to be voids or debris in the cavity.

Although the Housing Executive’s data on the construction of all of its stock is not comprehensive, it is estimated that if this 63% is extrapolated it would represent some 44,600 of the Housing Executive’s likely cavity wall constructed properties.

Since 2015 the Housing Executive has completed three schemes relating to cavity wall insulation:

A number of remedial works have been carried out through the Housing Executive’s response maintenance service but it has not been possible to collate this information in the time available.