Is the roof of the window sill plain concrete or reinforced concrete?

The roof of the window sill is reinforced concrete. The coping thickness of reinforced concrete windowsill is generally 60~ 150. On the one hand, the reinforced concrete window sill coping is set to form an intersecting circle with the reinforced concrete column of the window frame, so as to meet the requirements of structural stability, temperature change and earthquake resistance, and on the other hand, it is beneficial to the installation of plastic steel, aluminum alloy windows or steel windows and not to damage the window sill coping when nailing. Then it is to enlarge or hang the window sill and exterior wall shape. There is also the prominence of the outer window sill, which is conducive to setting up a dripping window sill.