Cwmcarn High School is to partially re-open this Friday after it was closed following an asbestos alert.
A spokesman for Caerphilly County Borough Council said it was finalising arrangements.
He said: “We are delighted to inform parents that Year 12 and 13 will be able to return to the school site on Friday (October 19) and should report to the Performing Arts centre at 8.30am. This newest part of the school (a stand-alone block) is available for use and is separate from the rest of the school buildings. We will also accommodate Year 11 pupils at the site from Monday October 22 and they should also report to the Performing Arts centre at 8.30am.
“The council took the difficult decision to close the school in light of the findings of a structural report and we are not prepared to fully re-open the site until further investigations have taken place to determine the extent of the problem and the work needed to address the situation. A range of options are being investigated for the other age groups and further updates will be posted on the council and school websites.
“The council and school will continue to work closely to resolve these issues as soon as possible.”
The Health and Safety Executive has confirmed it has begun an investigation into asbestos levels at Cwmcarn High School.
The school, which has 900 pupils, was closed until further notice on Friday October 12 after a structural report found asbestos.
NASUWT Cymru has said high levels of the substance was found when a company visited the school to carry out a survey on a boiler room.
Wales organiser Rex Phillips has said the asbestos was found in airborne particles, with two-thirds of the school “inoperable”.
The union has asked the Health and Safety Executive (HSE) to investigate and find out if correct procedures were followed.