diff --git a/Lib/glyphsLib/builder/builders.py b/Lib/glyphsLib/builder/builders.py
index 939c2d4cb..7bb472c21 100644
--- a/Lib/glyphsLib/builder/builders.py
+++ b/Lib/glyphsLib/builder/builders.py
@@ -168,6 +168,9 @@ def __init__(
             self._do_filter_instances_by_family = True
 
     def _is_vertical(self):
+        for feature in self.font.features:
+            if feature.name in ["vert", "vrt2", "vkna"]:
+                return True
         master_ids = {m.id for m in self.font.masters}
         for glyph in self.font.glyphs:
             for layer in glyph.layers:
diff --git a/Lib/glyphsLib/builder/glyph.py b/Lib/glyphsLib/builder/glyph.py
index f3a355e0d..c355f8476 100644
--- a/Lib/glyphsLib/builder/glyph.py
+++ b/Lib/glyphsLib/builder/glyph.py
@@ -139,7 +139,7 @@ def to_ufo_glyph(self, ufo_glyph, layer, glyph):  # noqa: C901
     self.to_ufo_components(ufo_glyph, layer)
     self.to_ufo_glyph_anchors(ufo_glyph, layer.anchors)
     if self.is_vertical:
-        self.to_ufo_glyph_height_and_vertical_origin(ufo_glyph, layer)
+        self.to_ufo_glyph_height_and_vertical_origin(ufo_font, ufo_glyph, layer)
 
 
 def to_glyphs_glyph(self, ufo_glyph, ufo_layer, master):  # noqa: C901
@@ -261,7 +261,7 @@ def to_glyphs_glyph(self, ufo_glyph, ufo_layer, master):  # noqa: C901
     self.to_glyphs_glyph_height_and_vertical_origin(ufo_glyph, master, layer)
 
 
-def to_ufo_glyph_height_and_vertical_origin(self, ufo_glyph, layer):
+def to_ufo_glyph_height_and_vertical_origin(self, ufo_font, ufo_glyph, layer):
     # implentation based on:
     # https://github.com/googlefonts/glyphsLib/issues/557#issuecomment-667074856
     assert self.is_vertical
@@ -270,6 +270,8 @@ def to_ufo_glyph_height_and_vertical_origin(self, ufo_glyph, layer):
 
     if layer.vertWidth:
         ufo_glyph.height = layer.vertWidth
+    elif "rotat" in ufo_glyph.name:
+        ufo_glyph.height = ufo_font[ufo_glyph.name.replace(".rotat", "")].width
     else:
         ufo_glyph.height = ascender - descender