Parents and carers of pupils at a Helensburgh school have been informed that collapse-risk concrete is present in the building.
Argyll and Bute Council confirmed John Logie Baird Primary had reinforced autoclaved aerated concrete (RAAC) present in the building, one of a handful of Scottish buildings.
They said "mitigation" was in place - including the installation of temporary propping and the restricting of access to parts of the building - and that repairs would be undertaken in the next 12 months.
The school - which the council says is the only one in Argyll and Bute where the material is present - remains open to both staff and pupils.
At the weekend, First Minister Humza Yousaf said Scottish schools affected would not close - unlike at least 150 in England that have switched back to remote learning.
An Argyll and Bute Council spokesperson said: "We can confirm that RAAC is present in some parts of John Logie Baird Primary School in Helensbugh.
"The safety of staff and pupils remains a priority and immediate measures are already in place to mitigate and reduce any concerns in affected parts of the building.
"This includes restricting access, temporary propping and ongoing monitoring. The school remains open under the mitigation measures.
"Working with consultant structural engineers, repairs to the building will take place within the next 12 months.”
Scottish ministers have no plans to close Scottish schools affected by collapse-risk concrete “at this stage”, Humza Yousaf has said.
The presence of the RAAC has been detected in 35 schools so far, according to the Scottish Government.
However, councils are currently assessing public buildings across Scotland – including schools – for the lightweight concrete, which was used from the 1950s up to the mid-1990s.
All are expected to report back next week.
It comes after the decision was taken to shut 104 schools in England becuase of concerns over the presence of the substance, after it was linked to the collapse of the roof at Singlewell Primary School in Kent in 2018.
Speaking to journalists in Edinburgh on Saturday, the First Minister said ministers “don’t think” schools will be required to move to temporary accommodation if the material is discovered.
He said: “We don’t think at this stage that there’s any need for any schools to shut.”
It comes after Scottish Education Secretary Jenny Gilruth told the BBC “a relatively small number” of Scottish schools were affected compared to the 2,500 total.
She said: “I have a list of schools that are impacted in Scotland, and the mitigations that our local authority partners have put in place will now be considered by officials in Scottish government.
“We’ll look to interrogate some of that data a bit further and also provide reassurance to parents and carers.
“I think it’s really important that our local authorities, who have a statutory responsibility for the delivery of education locally, engage directly with our parents and carers.”
The Scottish Government confirmed on Friday that it expects local authorities to prioritise remedial work where the substance is located.
And it said pupils will not be taught in the parts of buildings where the concrete is considered a risk.
Remedial works could include the closure of affected rooms or sections of a building and the use of temporary, modular provision for pupils.
According to the Institute of Structural Engineers, the material must only be replaced if it is considered to be in a poor condition and is considered high risk.
Figures obtained by the Scottish Liberal Democrats in May said the substance was present in 37 schools in Scotland.
The data showed the light and bubbly form of precast concrete was present in nine schools in Dumfries and Galloway, seven in Aberdeen, six in Clackmannanshire and five in West Lothian.
Two schools in Dundee, the Highlands and North Lanarkshire were also found to contain the material, as well as single schools in Aberdeenshire, Argyll and Bute, East Lothian and Perth and Kinross.
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