diff --git a/hub/imports/usage/nrcan_usage_parameters.py b/hub/imports/usage/nrcan_usage_parameters.py
index 5898f2a0..8073ca67 100644
--- a/hub/imports/usage/nrcan_usage_parameters.py
+++ b/hub/imports/usage/nrcan_usage_parameters.py
@@ -130,11 +130,16 @@ class NrcanUsageParameters:
   def _assign_comnet_extra_values(usage, archetype, occupancy_density):
     _occupancy = usage.occupancy
     archetype_density = archetype.occupancy.occupancy_density
-    _occupancy.sensible_radiative_internal_gain = archetype.occupancy.sensible_radiative_internal_gain \
-                                                  * occupancy_density / archetype_density
-    _occupancy.latent_internal_gain = archetype.occupancy.latent_internal_gain * occupancy_density / archetype_density
-    _occupancy.sensible_convective_internal_gain = archetype.occupancy.sensible_convective_internal_gain \
-                                                   * occupancy_density / archetype_density
+    if archetype_density == 0:
+      _occupancy.sensible_radiative_internal_gain = 0
+      _occupancy.latent_internal_gain = 0
+      _occupancy.sensible_convective_internal_gain = 0
+    else:
+      _occupancy.sensible_radiative_internal_gain = archetype.occupancy.sensible_radiative_internal_gain \
+                                                    * occupancy_density / archetype_density
+      _occupancy.latent_internal_gain = archetype.occupancy.latent_internal_gain * occupancy_density / archetype_density
+      _occupancy.sensible_convective_internal_gain = archetype.occupancy.sensible_convective_internal_gain \
+                                                     * occupancy_density / archetype_density
 
   @staticmethod
   def _calculate_reduced_values_from_extended_library(usage, archetype):