Set specular, roughness and metal values per surface type
Set the right specular, roughness and metal values for each surface type before you render.
For ceilings, set specular to zero, roughness to one and metal to zero.
For flooring and granite, use a higher specular value around 0.4 to get a glossy finish.
Apply these material values consistently across cabinets, ceilings, walls, flooring, granite and tiling before rendering.