Found this linked on Facepunch and, after basking in its glory, decided to link it here. The answer to all your "how do I texture the wall next to a ramp/stairs" problems.
http://forums.svencoop.com/showthread.php/41242-Skewing-textures-in-Hammer
Only caveat is that that was written for GoldSrc, which has a different Face Edit window; in modern Hammer the Align to View option is under Mode (by default it's Lift+Select).
http://forums.svencoop.com/showthread.php/41242-Skewing-textures-in-Hammer
Only caveat is that that was written for GoldSrc, which has a different Face Edit window; in modern Hammer the Align to View option is under Mode (by default it's Lift+Select).