Index: src/game/g_physics.c
===================================================================
--- src/game/g_physics.c	(revision 779)
+++ src/game/g_physics.c	(working copy)
@@ -61,7 +61,9 @@
 
   if( VectorLength( ent->s.pos.trDelta ) < 10 )
   {
-    VectorMA( trace->endpos, 0.5, trace->plane.normal, trace->endpos ); // make sure it is off ground
+    VectorMA( trace->endpos, 0.5f, trace->plane.normal, trace->endpos ); // make sure it is off ground
+	//r1ch: never allow origin to be snapped lower (buildables fall through map bug)
+    trace->endpos[2] = (float)ceil(trace->endpos[2]);
     SnapVector( trace->endpos );
     G_SetOrigin( ent, trace->endpos );
     ent->s.groundEntityNum = trace->entityNum;