diff --git a/lca_carbon_workflow.py b/lca_carbon_workflow.py
index 6d45e7e..aee5baa 100644
--- a/lca_carbon_workflow.py
+++ b/lca_carbon_workflow.py
@@ -56,10 +56,12 @@ class LCACarbonWorkflow:
     self.building_envelope_emission = []
     self.building_opening_emission = []
     self.building_component_emission = []
+    self.building_demolition_work_load = []
 
   def calculate_building_component_emission(self, building):
     surface_envelope_emission = []
     surface_opening_emission = []
+    boundary_volume = []
     opaque_surface_code = self.nrcan_catalogs.find_opaque_surface(
       self.nrcan_catalogs.hub_to_nrcan_function(building.function),
       self.nrcan_catalogs.year_to_period_of_construction(
@@ -69,10 +71,13 @@ class LCACarbonWorkflow:
     for surface in building.surfaces:
       boundary_envelope_emission = []
       boundary_opening_emission = []
+
+
       for boundary in surface.associated_thermal_boundaries:
         opening_emission = None
         layer_emission = self._calculate_envelope_emission(boundary)
         boundary_envelope_emission += layer_emission
+        boundary_volume.append(boundary.opaque_area * boundary.thickness)
 
         if boundary.window_ratio:
           opening_emission = self._calculate_opening_emission(
@@ -82,12 +87,13 @@ class LCACarbonWorkflow:
       if boundary_opening_emission:
         surface_opening_emission += boundary_opening_emission
       surface_envelope_emission += boundary_envelope_emission
+    building_envelope_volume = sum(boundary_volume)
     building_envelope_emission = sum(surface_envelope_emission)
     building_opening_emission = sum(surface_opening_emission)
     building_component_emission = \
         building_envelope_emission + building_opening_emission
     return building_envelope_emission, building_opening_emission, \
-        building_component_emission
+        building_component_emission, building_envelope_volume
 
   def _calculate_envelope_emission(self, boundary):
     layer_emission = []
@@ -115,8 +121,9 @@ class LCACarbonWorkflow:
 
   def calculate_emission(self):
     for building in self.city.buildings:
-      envelope, opening, building_component = \
+      envelope, opening, building_component, building_envelope_volume = \
        self.calculate_building_component_emission(building)
       self.building_envelope_emission.append(envelope)
       self.building_opening_emission.append(opening)
       self.building_component_emission.append(building_component)
+      self.building_demolition_work_load.append(building_envelope_volume)