> Sunlight that is scattered off the roof can scatter back off other roofs before heading into space. … but that's not what they're asking about? Imagine you'

> Sunlight that is scattered off the roof can scatter back off other roofs before heading into space. … but that's not what they're asking about? Imagine you're standing in a second story window, looking out. Out the window, you're seeing your neighbor's roof, coated with this stuff. A lot of sun is hitting that roof — How much heat is coming in through that window, off that roof? There have been stories in the past of reflective surfaces cooking nearby apartments, so I get the concern. I think in this case it boils down to it not being reflective, mostly, so it's fine.