diff --git a/hub/imports/construction/nrcan_physics_parameters.py b/hub/imports/construction/nrcan_physics_parameters.py
index dbe37684..77240a81 100644
--- a/hub/imports/construction/nrcan_physics_parameters.py
+++ b/hub/imports/construction/nrcan_physics_parameters.py
@@ -87,7 +87,7 @@ class NrcanPhysicsParameters:
     for thermal_zone in thermal_zones:
       thermal_zone.additional_thermal_bridge_u_value = archetype.extra_loses_due_to_thermal_bridges
       thermal_zone.effective_thermal_capacity = archetype.thermal_capacity
-      thermal_zone.indirectly_heated_area_ratio = archetype.indirect_heated_ratio
+      thermal_zone.indirectly_heated_area_ratio = 0
       thermal_zone.infiltration_rate_system_on = archetype.infiltration_rate_for_ventilation_system_on
       thermal_zone.infiltration_rate_system_off = archetype.infiltration_rate_for_ventilation_system_off
       for thermal_boundary in thermal_zone.thermal_boundaries: