Thousands of people have turned out at a demonstration in Dublin calling for redress for mica-affected homeowners.
The mineral causes massive structural problems, and many people will need to entirely re-build their properties.
While a State scheme funds 90% of restoration costs, protestors are calling for 100%.
Michael Doherty is from the Mica Action Group: "We saw that the 90-10 is actually closer to 60-40 for the vast majority of homeowners.
"People in Donegal are not in Dublin today looking for 10% - people in Donegal are looking for 40% of what it costs to put a home back to being a home".
Taoiseach Micheál Martin said earlier that the Government will refine and improve the current scheme for affected homeowners.
"We don't want homeowners to be significantly disadvantaged - we want to help them to get their houses restored to what they had anticipated when they bought their houses originally.
"And the scheme that's there will be a very substantive scheme.
"We will work through this with the Mica Action Group and the Minister's going to engage with them", Mr Martin said.
Housing lecturer at TU Dublin, Lorcan Sirr, said there could be a repeat of the mica controversy due to a failure to regulate the building industry.
"At the heart of this problem is the that fact that the industry's allowed self-regulate it's own work - it's like asking Leaving Cert students to mark their own exam papers.
"It's very likely that there could be other instances of poor construction quality yet to be discovered, whether they involve mica or pyrite is very hard to predict.
"But because that industry has been allowed self-regulate for so long, the chances of corners being cut are usually quite high."
'Extra tax on profits'
While People Before Profit has called for a tax on all builders, developers and suppliers involved in the mica and pyrite scandals.
Dubllin TD Bríd Smith said she believes the full cost should not fall on the State.
"The Celtic Tiger made an awful lot of people very, very wealthy in this country and they haven't paid the cost of it.
"So there should be - combined with the State, because the State are responsible - there should be an extra tax on profits on the people who benefitted."
On Newstalk Breakfast earlier, Jamie Lee Donnelly from the North Mayo Pyrite Group said the current redress scheme is "inadequate and inaccessible."
"They trialled this 90% scheme and there are so many hidden costs that go along that when you get into the devil of the detail, it is not 90% at all," she said.
"Even if it was a true 90/10 scheme, why should us homeowners have to foot that other 10% when this is no failing of our own?
"We bought our homes in good faith; we built our homes in good faith. These blocks didn’t come off the back of a lorry or off the black market – these were bought from companies that are registered in Ireland that are still operating today. Still making profits in this country."
Thousands of homeowners from Donegal, Mayo, Sligo and Clare have said they face paying up to €100,000 in repairs.
While Noel from the Donegal Mica Action Group told Lunchtime Live in May that his only option is demolition.
He said: "With the scheme that came in, I was one of those people that was reluctantly happy to see the 90/10 scheme.
"I thought that for 10% - I'm willing to take that 10% hit and get my home fixed for me and my family.
"We applied and we got approved for option one - of full demolition of the house - in December 2020.
"We currently have our house out to tender for builders, and we're already looking at possibly - given the current schemes and restrictions and the new regulations and stuff - we're looking at possibly over £100,000 [sic] to contribute to our own home.
"The engineer has recommended...the safest option for our house is for complete demolishment.
"Once we were told that, we looked at options of how could we make the scheme work best for us".
Additional reporting: Jack Quann