Footpath and grass on a roof?

[zyino]

Is there a way to get grass and a foothpath on a roof?

My house will be below ground level, but the flat roof will be exactly the same as ground level. Is there a way to connect them together without any glitches or something?

[whiterider]

You could cfe the house underground: http://www.modthesims.info/d/432769 (there's a link at the end to instructions/discussion on how to do it).