Cat on a cold tin roof

We brought our two old cats with us to Tasmania, Patsy (14 years old) and Lilly (13). While they were mostly outdoor cats in Sydney, we've decided to keep them indoors here, for various reasons. However, they do have access to our upstairs balcony when the door is open, and Lilly has taken to climbing over the balustrade and sitting on the colourbond roof in the sun... then walking all the way around the balustrade to the roof on the other side. Here she is in action.