After refer on other house with similar installation, we too decide to install tempered glass roof to extend, reduce heat and cover car from rain.
The installation took 2 days, first day was to fit bone supports in right place without the glass.
Two days after, tempered glass was installed. The glass is strong enough to support weight of a person.
Black glue foam was applied between glasses to avoid leaking, so far (two months) there are no water leaks while heavy rain.
Pretty satisfied with the installation, one thing to note is water marks will be there after rain, especially after sun-shower. The total cost is RM 7k+, took almost 3 week time to get everything done from dealing to installation complete.