Interesting, thank you. I am assuming they were not painted, whether to save money on paint, or for slip hazards... I have heard the "myth" about roofwalks not being painted, but I too have seen photographic evidence that they were indeed colored. Not sure if it was paint, or some sort of stain?
The two pics, are those from Alamosa? Never seen them before. Do you happen to have a better quality I may borrow for painting purposes?
Casey