See #1676. You can now set the type of boundary class prior to generating boundaries.

src/blenderbim/blenderbim/bim/module/boundary/operator.py

@@ -618,7 +618,7 @@ class AddBoundary(bpy.types.Operator, tool.Ifc.Operator):
         surface = tool.Model.export_surface(obj)
         connection_geometry = tool.Ifc.get().createIfcConnectionSurfaceGeometry(surface)
 
-        boundary = tool.Ifc.run("root.create_entity", ifc_class="IfcRelSpaceBoundary")
+        boundary = tool.Ifc.run("root.create_entity", ifc_class=context.scene.BIMModelProperties.boundary_class)
         boundary.RelatingSpace = relating_space
         boundary.RelatedBuildingElement = related_building_element
         boundary.ConnectionGeometry = connection_geometry

src/blenderbim/blenderbim/bim/module/model/data.py

@@ -63,6 +63,15 @@ class AuthoringData:
         cls.data["active_class"] = cls.active_class()
         cls.data["active_material_usage"] = cls.active_material_usage()
         cls.data["active_representation_type"] = cls.active_representation_type()
+        cls.data["boundary_class"] = cls.boundary_class()
+
+    @classmethod
+    def boundary_class(cls):
+        declaration = tool.Ifc.schema().declaration_by_name("IfcRelSpaceBoundary")
+        declarations = ifcopenshell.util.schema.get_subtypes(declaration)
+        names = [d.name() for d in declarations]
+        version = tool.Ifc.get_schema()
+        return [(c, c, get_entity_doc(version, c).get("description", "")) for c in sorted(names)]
 
     @classmethod
     def type_class(cls):

src/blenderbim/blenderbim/bim/module/model/prop.py

@@ -37,6 +37,12 @@ def get_type_class(self, context):
     return AuthoringData.data["type_class"]
 
 
+def get_boundary_class(self, context):
+    if not AuthoringData.is_loaded:
+        AuthoringData.load()
+    return AuthoringData.data["boundary_class"]
+
+
 def get_relating_type_id(self, context):
     if not AuthoringData.is_loaded:
         AuthoringData.load()
@@ -141,6 +147,7 @@ class BIMModelProperties(PropertyGroup):
     type_class: bpy.props.EnumProperty(items=get_type_class, name="IFC Class", update=update_type_class)
     type_predefined_type: bpy.props.EnumProperty(items=get_type_predefined_type, name="Predefined Type", default=None)
     type_name: bpy.props.StringProperty(name="Name", default="TYPEX")
+    boundary_class: bpy.props.EnumProperty(items=get_boundary_class, name="Boundary Class")
 
 
 class BIMArrayProperties(PropertyGroup):

src/blenderbim/blenderbim/bim/module/model/workspace.py

@@ -262,11 +262,6 @@ class BimToolUI:
         else:
             row.operator("bim.add_potential_opening", text="Add Void")
 
-        row = cls.layout.row(align=True)
-        row.label(text="", icon="EVENT_SHIFT")
-        row.label(text="", icon="EVENT_B")
-        row.operator("bim.add_boundary", text="Add Boundary")
-
         if AuthoringData.data["is_voidable_element"]:
             if AuthoringData.data["has_visible_openings"]:
                 row.operator("bim.edit_openings", icon="CHECKMARK", text="")
@@ -274,6 +269,12 @@ class BimToolUI:
             else:
                 row.operator("bim.show_openings", icon="HIDE_OFF", text="")
 
+        row = cls.layout.row(align=True)
+        row.label(text="", icon="EVENT_SHIFT")
+        row.label(text="", icon="EVENT_B")
+        row.prop(cls.props, "boundary_class", text="")
+        row.operator("bim.add_boundary", text="Add Boundary")
+
         cls.layout.row(align=True).label(text="Align")
         add_layout_hotkey_operator(cls.layout, "Align Exterior", "S_X", "")
         add_layout_hotkey_operator(cls.layout, "Align Centerline", "S_C", "")