diff --git a/pyproject.toml b/pyproject.toml
index 8c8723a..4404c4b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "cwapi3d"
-version = "33.318.0"
+version = "33.321.0"
 authors = [{ name = "Cadwork", email = "it@cadwork.ca" }]
 requires-python = ">= 3.14"
 description = 'Python bindings for CwAPI3D'
diff --git a/src/cadwork/ifc_predefined_type.pyi b/src/cadwork/ifc_predefined_type.pyi
index 9686df6..d221b8e 100644
--- a/src/cadwork/ifc_predefined_type.pyi
+++ b/src/cadwork/ifc_predefined_type.pyi
@@ -168,6 +168,27 @@ class ifc_predefined_type:
             bool
         """
 
+    def is_hollowcore(self) -> bool:
+        """is hollowcore
+
+        Returns:
+            bool
+        """
+
+    def is_joist(self) -> bool:
+        """is joist
+
+        Returns:
+            bool
+        """
+
+    def is_lintel(self) -> bool:
+        """is lintel
+
+        Returns:
+            bool
+        """
+
     def is_spandrel(self) -> bool:
         """is spandrel