diff --git a/hub/exports/building_energy/idf.py b/hub/exports/building_energy/idf.py
index 6d9e6fbb..76e93c89 100644
--- a/hub/exports/building_energy/idf.py
+++ b/hub/exports/building_energy/idf.py
@@ -338,11 +338,11 @@ class Idf:
       _kwargs = {'Name': vegetation_name,
                  'Outside_Layer': thermal_boundary.parent_surface.vegetation.name}
       for i in range(0, len(layers) - 1):
-        _kwargs[f'Layer_{i + 2}'] = layers[i].name
+        _kwargs[f'Layer_{i + 2}'] = layers[i].material_name
     else:
-      _kwargs = {'Name': thermal_boundary.construction_name, 'Outside_Layer': layers[0].name}
+      _kwargs = {'Name': thermal_boundary.construction_name, 'Outside_Layer': layers[0].material_name}
       for i in range(1, len(layers) - 1):
-        _kwargs[f'Layer_{i + 1}'] = layers[i].name
+        _kwargs[f'Layer_{i + 1}'] = layers[i].material_name
     self._idf.newidfobject(self._CONSTRUCTION, **_kwargs)
 
   def _add_window_construction_and_material(self, thermal_opening):