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On the topic of roof tiles, since it was being brought up, someone asked what would I do? Let me share my thought process how I came to the decision to replace them. For roof tiles, there are few options: 1) You can keep it as it is and don't do anything if it does not leak which one of my neighbour did when he renovated his house. This appeared to save a lot of $, but after he moved in, a few months later, the roof leaks, and he now got headache. Because all his furnitures, bed, wardrobes all in, by replacing roof, there will be lots of disturbance. By the way, his roof and mine are more than 25 years old. 2) If some parts are leaking, thinking of just replacing the defective parts, but can't be sure other parts will be defective soon, since these roof tiles are same 'age' and subject to the same weather conditions, if some parts are deteriorating, others will soon follow. 3) Change the entire roof to the full piece metal composite type of modern roof - nice and reliable, but very high cost, because the structures supporting it will need to be changed. The high cost killed the idea. These type of full piece metal composite roof will be suitable for new built where the new structures can be designed for it, not suited for A&A. 4)One of the cheapest method is retain the same roof, and apply coating. Cost is cheap, about 25%~30% when compared to replacing the entire roof with new clay type of roof. However, personally, i am of the opinion that coating - (where the tiles are washed, then sealer is applied, then about 2 layers of membrance is sprayed using power jet spray) will not last as long as replacing the new roof, obvious warranty is lesser,and now only rely on the top membrane coating to protect against sun and rain. OK if there is limited budget. But risk is surely higher than new roof. 5)Last but not least, total replacement, using clay type of roof. Since my previous was concrete roof, which had cracked, turned porous, and infected with fungus and algae, and throughout the years, the concrete had become 'brittle'. Replace with the proven clay roof, as it has high heat resistance, (and unlike metal, which can be noisy if rain falls,) clay is quite 'sound -proofing'. and can use back the same batten and truss, only when take out the old concrete tiles, then can check and replace those batten which were defective, cost is much controlled. And at the same time, replace the insulation and secure with a new wire mesh, + false ceiling later on, now we can sleep in peace...... Old roof: new roof: