Engineers working at Spencer Court say the recent wet weather has put their work to the test.
The flats in Newburn were demolished after rain caused a culvert to collapse, washing away the ground underneath.
Boulders put in place to support the construction work are withstanding the current wet weather but there are fears more rainfall may cause flooding.
Site staff say the next 48 hours are critical.
More top news
The Met Office have issued a yellow "Be Aware" warning of strong winds for the region for Sunday into Monday
Emma Jesson brings you Saturday night's forecast
Christmas Eve could be rather frosty and at present, Christmas Day looks like being cold and clear with one or two wintry showers