More than 200 pupils at Nazareth House Primary School in Londonderry remain at home on Thursday, after safety concerns over the building's roof forced the school to close.
The Education Authority (EA) said urgent remedial works have been prioritised to allow it to reopen as soon as possible, but parents like Terri Lamberton are worried about how long that will take.
She has two children at the school, including seven-year-old Daniel, who has special educational needs.
"Because of the disorders that my own wee child has, routine and repetition for him is so important and his ability to retain information will really be affected by not being able to access school," she said.