diff --git a/input_files/nrcan_materials_dictionaries.json b/input_files/nrcan_materials_dictionaries.json
new file mode 100644
index 0000000..9c33de6
--- /dev/null
+++ b/input_files/nrcan_materials_dictionaries.json
@@ -0,0 +1,2330 @@
+{
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+  "virtual_no_mass_538": {
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+  "virtual_no_mass_539": {
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+    "thermal_resistance": 2.478598280790823
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+}
\ No newline at end of file
diff --git a/lca_carbon_workflow.py b/lca_carbon_workflow.py
index e5e2e80..0b7e934 100644
--- a/lca_carbon_workflow.py
+++ b/lca_carbon_workflow.py
@@ -16,6 +16,8 @@ from city_model_structure.life_cycle_assessment.access_nrcan_catalogue \
   import AccessNrcanCatalog
 from city_model_structure.life_cycle_assessment.opening_emission \
   import OpeningEmission
+from city_model_structure.life_cycle_assessment.envelope_emission \
+  import EnvelopeEmission
 
 
 class LCACarbonWorkflow:
@@ -66,9 +68,18 @@ class LCACarbonWorkflow:
       boundary_opening_emission = []
       for boundary in surface.associated_thermal_boundaries:
         opening_emission = []
+        layer_emission = []
         if boundary.window_ratio == 0:
           opening_surface = 0
           opening_material_emission = 0
+          for layer in boundary.layers:
+            layer_emission.append(EnvelopeEmission(
+              self.nrcan_catalogs.search_materials(
+                layer.material_name)['embodied_carbon'],
+              boundary.opaque_area,
+              layer.thickness).calculate_envelope_emission())
+# continue from here, but remember, since the area of windows and opaque is at hand, we may not need a conditional for window_ratio
+
         else:
           opening_emission = self._calculate_opening_emission(
             building, surface, boundary, opaque_surface_code)
@@ -94,6 +105,9 @@ class LCACarbonWorkflow:
         opening.area).calculate_opening_emission())
     return opening_emission
 
+  def _calculate_envelope_emission(self):
+    pass
+
   def calculate_emission(self):
     for building in self.city.buildings:
       self.calculate_building_component_emission(building)