The heat coefficient on a building can be massively lowered with effective insulation. And in the case of older buildings, it’s much better, and more cost effective, to put that insulation on the OUTSIDE of the roof. Apart from having the dewpoint outside of the main structure, resulting in less condensation and dampness inside, there’s no mucking around in crawl-spaces, or other distractions to hamper the regular use of the building.
We recently undertook the insulation of this block at Auckland University. With no fire risks nearby, we used a torch-on membrane, which we painted white on completion. We used a FLIR thermal imaging camera to test the resultant drop in temperature. In the aukland Summer it went from a staggering 45 degrees to barely over the ambient temperature.
Apart from improving the comfort level within the building, this non-invasive retrofit saves the University thousands of dollars a year in heating and cooling costs.