diff --git a/src/blenderbim/blenderbim/bim/import_ifc.py b/src/blenderbim/blenderbim/bim/import_ifc.py
index 0f38a0b258..b882938e5e 100644
--- a/src/blenderbim/blenderbim/bim/import_ifc.py
+++ b/src/blenderbim/blenderbim/bim/import_ifc.py
@@ -158,6 +158,14 @@ class MaterialCreator:
         for item in representation.Items:
             if item.is_a("IfcMappedItem"):
                 items.extend(item.MappingSource.MappedRepresentation.Items)
+            if item.is_a("IfcBooleanResult"):
+                operand = item.FirstOperand
+                while True:
+                    items.append(operand)
+                    if operand.is_a("IfcBooleanResult"):
+                        operand = operand.FirstOperand
+                    else:
+                        break
             items.append(item)
         return items