diff --git a/hub/city_model_structure/life_cycle_assessment/access_nrcan_catalogue.py b/hub/city_model_structure/life_cycle_assessment/access_nrcan_catalogue.py
index 126c7083..d17162ce 100644
--- a/hub/city_model_structure/life_cycle_assessment/access_nrcan_catalogue.py
+++ b/hub/city_model_structure/life_cycle_assessment/access_nrcan_catalogue.py
@@ -113,6 +113,9 @@ class AccessNrcanCatalog:
       elif opaque_surface[opaque_surface_key]['type'] == component_type:
         return opaque_surface[opaque_surface_key]['layers']
 
+  def search_materials(self, material_name):
+    return self.materials[f'{material_name}']
+
   def search_transparent_surfaces(
           self, surface_type, opaque_surface_code):
     return self.transparent_surfaces[
diff --git a/hub/city_model_structure/life_cycle_assessment/envelope_emission.py b/hub/city_model_structure/life_cycle_assessment/envelope_emission.py
index 511201e2..c736da8f 100644
--- a/hub/city_model_structure/life_cycle_assessment/envelope_emission.py
+++ b/hub/city_model_structure/life_cycle_assessment/envelope_emission.py
@@ -28,7 +28,7 @@ class EnvelopeEmission:
   def envelope_surface(self):
     return self._envelope_surface
 
-  def envelope_emission(self):
+  def calculate_envelope_emission(self):
     return self._envelope_material_emission * \
            self.envelope_thickness * \
            self._envelope_surface