I took another peek at the back porch.... you have no fall on the roof or the siding is not level.
Mack1 over-estimates me.... I'm a trim carpenter. (I think) I've just had lots of experience in many areas.... including concrete.....dammit.
Maybe I will have to explain myself to the forum and post some pics:
http://www.smugmug.com/browse/
I'm not there yet..... I used to be but cancelled due to my finances some time ago. If I get it back up I will let the forum know.