Wall will not follow given curve.

 From:  Frenchy Pilou (PILOU)
9479.2 In reply to 9479.1 
Different methods can be possible depending of your precision wished

Extrude a volume toward you wall / Intesect ...Fillet etc

Project curves to your wall ...extrude...Fillet etc... (best)

"Flow" a volume to your wall

Draw a curve on your wall ...extrude...Fillet etc...

etc...

here the Flow method ( Transform / Flow)

EDITED: 26 Aug 2019 by PILOU