One campaigner says today is a 'momentous day' for those whose homes are affected by mica.
Housing Minister Darragh O'Brien will meet mica homeowners later for a crucial meeting on the redress scheme.
He will receive the final report on the scheme on Thursday, before bringing recommendations to Cabinet early next month.
The redress scheme established in January 2020 offers homeowners 90% of the cost of repairs.
However, campaigners want 100% compensation for their homes being built with the faulty blocks.
In around one-third of cases, the houses will need to be demolished and re-built with the total cost expected to be well over €1bn.
Ann Owens is a member of the Mica Working Group and told Newstalk Breakfast they are apprehensive, but hopeful.
"Today is an absolutely momentous day for mica campaigners... we have a meeting today at 5.30 with Darragh O'Brien, Minister for Housing.
"Present at that meeting will be the home representatives, the civil servants and the minister himself.
"And he will be listening intently to the decisions of both parties, which by the way varies quite a lot, and he will be taking that information away for consideration and decision-making by Cabinet.
"So we are very apprehensive, we are hoping for the very best because we have been working on this campaign for 10 years."
She says one measure they are looking for is 100% redress for their homes.
"We're looking for a number of measures, and yes, we need 100%.
"We have an existing scheme, but as a result of the caps which are included in that, the caps are too restrictive at the moment.
"So that means that the 90% scheme, which people believe that we have already, is not a reality.
"And as a result of that many, many, many families cannot avail of that".
But she says there has to be a guarantee that people can re-enter the scheme if necessary.
"We have other red lines as well: we need a guarantee that families who accept one of the four mediation options can re-enter the scheme if their internal walls begin to crack.
"Without this assurance... families cannot be sure that their house is really fixed.
"At the moment, and this is not well known, that it is only the repaired block work that is guaranteed - not the retained block work".
And Ann says this is all down to systemic failures across the board.
"We people in Donegal and Mayo, we bought our homes, we built our homes in good faith.
"And the process broke down - this was not a flash in the pan breakdown.
"This was systemic failure for 40 full years... so the people who were supposed to be doing their job - ranging right from the people who quarry at the mines, who bring out that aggregate, who create those blocks: they all failed.
"And the Government failed to oversee and enforce practices at national and EU level".