Yesterday I noticed some faint water marks on the ceiling panel below the roof top water storage tank and the cement floor was damp. Suspecting leakage either in the water tank or the cold water plumbing system I climbed up into the tiny ceiling crawl space to inspect the poly tank and the plumbing. At first I thought the leak was due to the old cold water plumbing, but after careful inspection found nothing.
Expecting to see a puddle of water all I could see were faint traces of wet marks on the plywood decking and also on the ceiling panel. Couldn't detect any cracks visible in the tank wall Could not tell for sure whether the wall or the bottom of the tank was leaking.
Then today mysteriously the leak stopped. There was no leak detected in the afternoon and evening. The repair man who climbed up into the ceiling said the sediments collected at the base of the tank had probably plugged the leak. He advised to monitor the situation for a few more days. If the leak continues to call him on Wed.
I hope that should the tank leak again the defect can be repaired by patching with some kind of membrane or adhesive. Replacing the current tank with a new one is going to be a messy job as it involves cutting the timber rafters, battens and opening the roofing tiles to gain access into the ceiling space under the roof covering.
What happened to the leak? Did you decide to just patch it? I think it would be better if you get yourself a new water tank. You can use polyurethane base sealant to patch it. However, the area would eventually take extra wear and tear, so it would be good to check it every once in a while.
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