1. Black solar panels can be used on the roofs. Black solar panels will not affect the aesthetics of the building elevation and it will also absorb light and generate electricity more efficiently than polycrystalline blue solar panels.
2. The shades of Grey and Brown are most commonly used to absorb natural day light.
3. The slope of the roof is 15-18 degrees for a conventional house, and 25-30 degrees for a glass room.
