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.

This post has been edited by Iceman74: Oct 16 2024, 11:17 AM

House hot can be due to many reasons.
If just for specify on roof itself, the effect of using clay tiles or cement tiles consist of small % different that generating the heat inside the house below if ignore other source of heat onto the house.

You need to understand how the sun transmits the heat onto the surface and below.
The design of the roof plays a large role how the house comfortable below beside the surrounding area. You will start seeing more house design with high roof because of 2 things, air is not a good conductor heat transmission plus with good ventilation work wonders, but we all scare of small animal running wild on the roof if too much open for ventilation.


Surrounding with a lot of trees and shade compare with open empty concrete heat absorbing and hot tarmac road.
Example house in rural area always cooler than vs house in urban area

keyword

Radiant Heat
Ventilation
Insulation

https://rumahhq.com/how-to-create-a-cool-ro...malaysian-heat/

This post has been edited by Iceman74: Oct 16 2024, 03:19 PM