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This is one cursed project. Aircon spoil or leakages or insects...
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I had similar ceiling cracks after roof work at my place too. The contractor said shifting weight and vibrations can stress older plaster. I ended up patching and repainting, but if it keeps spreading, I might need a structural check. I also read some tips on
Masonry dallas—it was helpful to understand how masonry shifts can lead to interior cracks even without visible exterior damage.
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China contractor like that one lousy...
Thats why T5 changi airport cannot take such risk...we rather spend high cost to engage Japan and western for critical structure. Those toilet and small items non important stuffs can just use China. Well done PAP.