GROK says…
Q: When they say BLUE roofs, what color blue?
A: When people refer to "BLUE roofs," they are usually not specifying a particular shade of blue. However, in contexts like disaster recovery or environmental initiatives:
FEMA's Blue Roof Program: After natural disasters like hurricanes, FEMA might use a specific blue tarp or sheeting for temporary roof repairs. This is often a bright, vibrant blue, sometimes described as "FEMA blue" or "tarp blue," which is close to Pantone 2935 C or similar.
Environmental or Energy Efficiency: In projects aimed at reducing heat absorption or reflecting sunlight, roofs might be painted or covered with a reflective blue material. Here, the color might lean towards lighter, more pastel shades of blue that reflect more light, like sky blue or baby blue.
Aesthetic or Architectural Choices: In urban planning or architecture, "blue roofs" could refer to any shade of blue chosen for visual appeal or thematic reasons, ranging from deep navy to light azure, depending on the design intent.
If you're looking at a specific context or project, the exact shade might be detailed in project specifications or local building codes, but generally, "blue" in this context is more about the concept than the precise color. If you have a specific project or location in mind, that might narrow down the shade further.