diff --git a/domain/modelling/generators/roof_recommendation.py b/domain/modelling/generators/roof_recommendation.py
index 3bdebd1b9..f20a5103a 100644
--- a/domain/modelling/generators/roof_recommendation.py
+++ b/domain/modelling/generators/roof_recommendation.py
@@ -130,7 +130,9 @@ def recommend_roof_insulation(
     if "no access" in roof_type:
         return None  # the roof void can't be reached to insulate it
 
-    if main.roof_insulation_thickness != _ROOF_UNINSULATED_MM:
+    if not _pitched_roof_is_uninsulated(
+        main.roof_insulation_thickness, main.construction_age_band
+    ):
         return None
     return _roof_recommendation(
         epc,