diff --git a/etl/epc_clean/epc_attributes/FloorAttributes.py b/etl/epc_clean/epc_attributes/FloorAttributes.py
index 6631b4d5..245a91bc 100644
--- a/etl/epc_clean/epc_attributes/FloorAttributes.py
+++ b/etl/epc_clean/epc_attributes/FloorAttributes.py
@@ -107,4 +107,8 @@ class FloorAttributes(Definitions):
         else:
             result['insulation_thickness'] = None
 
+        if result["another_property_below"]:
+            result["thermal_transmittance"] = 0
+            result["thermal_transmittance_unit"] = 'w/m-¦k'
+
         return result