"Asbestos has not been confirmed at the site" said South Wales Fire & Rescue Service.
"However if asbestos is confirmed, this does not pose a safety risk to the public as heavy rainfall and water from firefighting will prevent the asbestos from spreading"
More top news
Gareth Bale has been crowned Welsh player of the year for a record fifth time.
Not the nicest of nights it has to be said! And there is more dreadful weather to come tomorrow!
In an exclusive interview, Mathew James and Saera Wilson talk about their efforts to rebuild their lives and their dream wedding.