The three stories building was a bit too tall to carry out any insulation on the outside.
I am very sure he is not willing to climb those tall staging to cover up the external walls.
My suggestion to him was to heat shield from the inside.
Much simpler and easier to carry out.
He might want to carry it out himself.
First he need to calculate the surface areas where he wanted to heat shield.
Once that is determined he can start to calculate the amount of raw materials required.
He need wood (2"x 2"), bubble heat shield (QTE), cement boards (4' X 4') and a lot of those nails plus stapler gun bullets.
He should start from one end of the walls and finish it up to the other end.
Start with the bottom part and then move to the upper sections.
One very tricky thing to do is to get the air ventilation holes made.
The bubble shield and the cement boards that will on these 4" diameter holes need to be precisely cut.
Once he mastered that things will be very smooth.
Have a look at these pictures which was extracted from the list of pictures taken while installing the same at Chenderong Balai, Perak
Enjoy the pictures: