Walking on the roof is not exactly a common thing to do, but sometimes it is necessary, in order to perform repairs or maintenance operations to the cover or to the drainage system.
Walking on the roof is a very risky thing to do, especially in the case of pitched roofs, and must be done only with adequate protective equipment. Your safety and the safety of those who work on your roof are essential, but sometimes it is not just about safety; it is also about the high risk of causing roof damage.
If, in the case of flat roofs, some membranes are highly resistant and can be safely walked on, when it comes to tiles and shingles, they are much more prone to damage caused by human traffic. For example, walking on asphalt shingles may dislodge them and remove the protective granules, walking on ceramic tiles may create cracks and gaps, while walking on a metal roof may cause scratches, which represent the starting point for corrosion.
This is why the access on the roof must be restricted to anyone but roofers in Austin Texas with safety gear and training. They know best the safest areas to step on and always wear protective shoes and equipment to prevent damage.