Suggest to install a layer of insulation under tile roof, above ceiling and enable air flow for heat to escape ceiling.

if you insulate cement roof where heat has no path to escape then you can enjoy warmth.
you may want to research online on what works best, then acquire quotes around your area.

TQ for the input at WTA Chest pain.

Just give call to company that do that

https://homementor.com.my/roofing/best-roof-repair-malaysia/

heard something like fixing awning on top of existing roof
sounds not so pretty looking but guess can reduce heat

i have turbines on roof
first few days felt the difference in temperature
but now like used to it oredi

the cost varies a lot depending on the installer.
Me didn't ask about using clay tiles. Me got quoted from 30k(reputable installer) to normal installer(roughly more than 10k) excluding extra insulation sheet (need add few k depending quality) recently

me didn't do it now as my roof tiles still ok( 20+ years only) but look very not nice. Thinking paint or replace it. Was advice by friends, if ok, don't risk it.
Just change and repair those broken tiles will do, roof tiles should withstand at least, if not more than 30 years.
Experience and workmanship are very important. He saw many change roof tiles but leaking much worse.

His explanation
Our wooded roof truss after so many years with the weight on it, will bend/deformed to a certain way.
Experience installers need to compensate those things in order for future leaking during installation or change the whole roof truss to steel (he prefers this method to settle all problem associated with old wooden roof truss.

I don't see changing to clay tiles justify the extra cost, but it does look nicer and without worry of color distortion comparing with cement type.

For me, I would invest in good insulation than clay tiles. It does provide 2nd layer of protection but will have other set of problems.
The major problem about adding insulation is detecting the actual leaking location and after many years, it will decay.

https://forum.lowyat.net/index.php?showtopic=5390606
The installation method may only withstand for a few years.
Nonetheless, there is a market for the material in MY.

How long has this method last?

+1 Thanks.
Got brand of the material?

Read in some older threads that there could be mold due to moisture trap, so need to check regularly?