Posting on the 100% Redress No Less Facebook page over the weekend, many took to the platform to warn others affected by Mica to unplug from all of their electricity sockets and check them for moisture coming through the blocks.

The warning led to a flurry of responses, with many others citing they have been having the same issue and have resorted to using extension leads from the interior walls.

Meanwhile, yesterday’s Sunday Business reported manufacturing company Cassidy  Brothers, said the outlook for its survival is “grim” and told activists it has made a “substantial” number of redundancies over the last few weeks.

The latest move comes as some families in Donegal face up to the possibility of paying €100,000 to fix their damaged homes, and comes as homeowners await a government decision over whether they will be given 100 per cent compensation for remedial works.

The Cassidy family are behind one of the largest suppliers of concrete blocks in the Northwest of Ireland. Their company, Cassidy Brothers, has supplied millions of blocks that were used to build homes in the region.

Their have been calls for a boycott of the company in the wake of the emergence of structural damage caused to homes.

Managing Director of Cassidy Brothers, David Cassidy has told the Mica Action Group that some aspects of the campaign have had a “seriously detrimental effect” on the business, which has spanned more than eight decades.

The 16-page letter was seen by the Sunday Business Post. It reveals how the children of the directors had been exposed to abusive and threatening messages about the Cassidy family.

“Our employees have families too, and, very rightly and properly, they have been very upset and distressed at some of the actions taken against them, and the abuse and threats directed at them,” reads the letter.

Michael Doherty, of the Mica Action Group, to whom the letter was addressed, told the Sunday Business Post that the group “had always endeavoured to conduct our proceedings in a responsible, respectful manner, and will continue to do so.”

Paddy Diver of the 100% Redress No Less,  provided a separate response to the letter. He said the campaign “was not a witch hunt: It is a campaign for all affected families”.

The Cassidy’s letter also said the company had “always adhered rigidly to all standards and regulations set down by the government as well as consistently following best practice in our sector”.