Sydney rain: Warning over tell-tale sign your roof is about to collapse

If you look up at your ceiling and notice a slight droop it could be a sign it is about to collapse.

A photo of a ceiling's significant dip due to a section of it collecting water in one area has been shared online as homes across the east coast cop an incredible drenching.

"Pro tip: If your ceiling starts growing boobs, grab a screwdriver to pierce a hole and drain the water," the Warringah/Pittwater SES advised via a Facebook post by the Manly Observer.

"[This will] reduce the risk of your ceiling collapsing," the post continued.

"Make sure you have a bucket and put a towel in the bucket to deaden the dripping noise."

NSW continues to be hit with excessive rain

The advice comes as Sydney is hit with more heavy rain, continuing to trouble areas already dealing with rising floodwaters.

Images and videos on social media show flooded waterways across Sydney including on the northern beaches where cars were stranded on major roads in knee deep water including on the Roseville Bridge and at Pittwater Road in Dee Why and Narrabeen.

On Tuesday, residents around the Manly Dam area were ordered to evacuate as the dam spilled over into adjacent areas. More than 2000 people were affected.

• Thousands told to flee as Sydney floods, others warned not to travel

• Two bodies found in Sydney canal as NSW flood emergency escalates

• Why your dog shouldn't play in floodwaters: 'Just dangerous'

Rain set to ease on Wednesday in Sydney

The Bureau of Meteorology issued a severe thunderstorm warning for “intense rainfall that will lead to life threatening flash flooding and possible landslides” heading into the Sydney metropolitan area on Tuesday.

There are evacuation orders or warnings in the west, south-west, north-west of Sydney as well as the northern beaches with residents are being warned to stay inside and up to date with flood warnings and evacuation orders.

There are now 59 evacuation orders across NSW as well as 16 evacuation warnings and multiple flood warnings.

On Tuesday, Sydney was expected to receive between 120 to 150 mm of rain, according to the Bureau of Meteorology.

Relief is in sight though. Only 0 to 3mm is forecast for Sydney on Wednesday with a 50 per cent chance of rain.

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